``` ├── .gitignore ├── COPYING.txt ├── README.md ├── docs/ ├── bom.ods ├── hardware.md ├── pin_assign.ods ├── echo-r1/ ├── audio.kicad_sch ├── buttons.kicad_sch ├── cpu_memory.kicad_sch ``` ## /.gitignore ```gitignore path="/.gitignore" # For PCBs designed using KiCad: https://www.kicad.org/ # Format documentation: https://kicad.org/help/file-formats/ # Temporary files *.000 *.bak *.bck *.kicad_pcb-bak *.kicad_sch-bak *-backups *.kicad_prl *.sch-bak *~ _autosave-* *.tmp *-save.pro *-save.kicad_pcb fp-info-cache ~*.lck \#auto_saved_files# # Netlist files (exported from Eeschema) *.net # Autorouter files (exported from Pcbnew) *.dsn *.ses # Exported BOM files *.xml *.csv # LibreOffice lock files *.ods# ``` ## /COPYING.txt CERN Open Hardware Licence Version 2 - Strongly Reciprocal Preamble CERN has developed this licence to promote collaboration among hardware designers and to provide a legal tool which supports the freedom to use, study, modify, share and distribute hardware designs and products based on those designs. Version 2 of the CERN Open Hardware Licence comes in three variants: CERN-OHL-P (permissive); and two reciprocal licences: CERN-OHL-W (weakly reciprocal) and this licence, CERN-OHL-S (strongly reciprocal). The CERN-OHL-S is copyright CERN 2020. Anyone is welcome to use it, in unmodified form only. Use of this Licence does not imply any endorsement by CERN of any Licensor or their designs nor does it imply any involvement by CERN in their development. 1 Definitions 1.1 'Licence' means this CERN-OHL-S. 1.2 'Compatible Licence' means a) any earlier version of the CERN Open Hardware licence, or b) any version of the CERN-OHL-S, or c) any licence which permits You to treat the Source to which it applies as licensed under CERN-OHL-S provided that on Conveyance of any such Source, or any associated Product You treat the Source in question as being licensed under CERN-OHL-S. 1.3 'Source' means information such as design materials or digital code which can be applied to Make or test a Product or to prepare a Product for use, Conveyance or sale, regardless of its medium or how it is expressed. It may include Notices. 1.4 'Covered Source' means Source that is explicitly made available under this Licence. 1.5 'Product' means any device, component, work or physical object, whether in finished or intermediate form, arising from the use, application or processing of Covered Source. 1.6 'Make' means to create or configure something, whether by manufacture, assembly, compiling, loading or applying Covered Source or another Product or otherwise. 1.7 'Available Component' means any part, sub-assembly, library or code which: a) is licensed to You as Complete Source under a Compatible Licence; or b) is available, at the time a Product or the Source containing it is first Conveyed, to You and any other prospective licensees i) as a physical part with sufficient rights and information (including any configuration and programming files and information about its characteristics and interfaces) to enable it either to be Made itself, or to be sourced and used to Make the Product; or ii) as part of the normal distribution of a tool used to design or Make the Product. 1.8 'Complete Source' means the set of all Source necessary to Make a Product, in the preferred form for making modifications, including necessary installation and interfacing information both for the Product, and for any included Available Components. If the format is proprietary, it must also be made available in a format (if the proprietary tool can create it) which is viewable with a tool available to potential licensees and licensed under a licence approved by the Free Software Foundation or the Open Source Initiative. Complete Source need not include the Source of any Available Component, provided that You include in the Complete Source sufficient information to enable a recipient to Make or source and use the Available Component to Make the Product. 1.9 'Source Location' means a location where a Licensor has placed Covered Source, and which that Licensor reasonably believes will remain easily accessible for at least three years for anyone to obtain a digital copy. 1.10 'Notice' means copyright, acknowledgement and trademark notices, Source Location references, modification notices (subsection 3.3(b)) and all notices that refer to this Licence and to the disclaimer of warranties that are included in the Covered Source. 1.11 'Licensee' or 'You' means any person exercising rights under this Licence. 1.12 'Licensor' means a natural or legal person who creates or modifies Covered Source. A person may be a Licensee and a Licensor at the same time. 1.13 'Convey' means to communicate to the public or distribute. 2 Applicability 2.1 This Licence governs the use, copying, modification, Conveying of Covered Source and Products, and the Making of Products. By exercising any right granted under this Licence, You irrevocably accept these terms and conditions. 2.2 This Licence is granted by the Licensor directly to You, and shall apply worldwide and without limitation in time. 2.3 You shall not attempt to restrict by contract or otherwise the rights granted under this Licence to other Licensees. 2.4 This Licence is not intended to restrict fair use, fair dealing, or any other similar right. 3 Copying, Modifying and Conveying Covered Source 3.1 You may copy and Convey verbatim copies of Covered Source, in any medium, provided You retain all Notices. 3.2 You may modify Covered Source, other than Notices, provided that You irrevocably undertake to make that modified Covered Source available from a Source Location should You Convey a Product in circumstances where the recipient does not otherwise receive a copy of the modified Covered Source. In each case subsection 3.3 shall apply. You may only delete Notices if they are no longer applicable to the corresponding Covered Source as modified by You and You may add additional Notices applicable to Your modifications. Including Covered Source in a larger work is modifying the Covered Source, and the larger work becomes modified Covered Source. 3.3 You may Convey modified Covered Source (with the effect that You shall also become a Licensor) provided that You: a) retain Notices as required in subsection 3.2; b) add a Notice to the modified Covered Source stating that You have modified it, with the date and brief description of how You have modified it; c) add a Source Location Notice for the modified Covered Source if You Convey in circumstances where the recipient does not otherwise receive a copy of the modified Covered Source; and d) license the modified Covered Source under the terms and conditions of this Licence (or, as set out in subsection 8.3, a later version, if permitted by the licence of the original Covered Source). Such modified Covered Source must be licensed as a whole, but excluding Available Components contained in it, which remain licensed under their own applicable licences. 4 Making and Conveying Products You may Make Products, and/or Convey them, provided that You either provide each recipient with a copy of the Complete Source or ensure that each recipient is notified of the Source Location of the Complete Source. That Complete Source is Covered Source, and You must accordingly satisfy Your obligations set out in subsection 3.3. If specified in a Notice, the Product must visibly and securely display the Source Location on it or its packaging or documentation in the manner specified in that Notice. 5 Research and Development You may Convey Covered Source, modified Covered Source or Products to a legal entity carrying out development, testing or quality assurance work on Your behalf provided that the work is performed on terms which prevent the entity from both using the Source or Products for its own internal purposes and Conveying the Source or Products or any modifications to them to any person other than You. Any modifications made by the entity shall be deemed to be made by You pursuant to subsection 3.2. 6 DISCLAIMER AND LIABILITY 6.1 DISCLAIMER OF WARRANTY -- The Covered Source and any Products are provided 'as is' and any express or implied warranties, including, but not limited to, implied warranties of merchantability, of satisfactory quality, non-infringement of third party rights, and fitness for a particular purpose or use are disclaimed in respect of any Source or Product to the maximum extent permitted by law. The Licensor makes no representation that any Source or Product does not or will not infringe any patent, copyright, trade secret or other proprietary right. The entire risk as to the use, quality, and performance of any Source or Product shall be with You and not the Licensor. This disclaimer of warranty is an essential part of this Licence and a condition for the grant of any rights granted under this Licence. 6.2 EXCLUSION AND LIMITATION OF LIABILITY -- The Licensor shall, to the maximum extent permitted by law, have no liability for direct, indirect, special, incidental, consequential, exemplary, punitive or other damages of any character including, without limitation, procurement of substitute goods or services, loss of use, data or profits, or business interruption, however caused and on any theory of contract, warranty, tort (including negligence), product liability or otherwise, arising in any way in relation to the Covered Source, modified Covered Source and/or the Making or Conveyance of a Product, even if advised of the possibility of such damages, and You shall hold the Licensor(s) free and harmless from any liability, costs, damages, fees and expenses, including claims by third parties, in relation to such use. 7 Patents 7.1 Subject to the terms and conditions of this Licence, each Licensor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in subsections 7.2 and 8.4) patent licence to Make, have Made, use, offer to sell, sell, import, and otherwise transfer the Covered Source and Products, where such licence applies only to those patent claims licensable by such Licensor that are necessarily infringed by exercising rights under the Covered Source as Conveyed by that Licensor. 7.2 If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Covered Source or a Product constitutes direct or contributory patent infringement, or You seek any declaration that a patent licensed to You under this Licence is invalid or unenforceable then any rights granted to You under this Licence shall terminate as of the date such process is initiated. 8 General 8.1 If any provisions of this Licence are or subsequently become invalid or unenforceable for any reason, the remaining provisions shall remain effective. 8.2 You shall not use any of the name (including acronyms and abbreviations), image, or logo by which the Licensor or CERN is known, except where needed to comply with section 3, or where the use is otherwise allowed by law. Any such permitted use shall be factual and shall not be made so as to suggest any kind of endorsement or implication of involvement by the Licensor or its personnel. 8.3 CERN may publish updated versions and variants of this Licence which it considers to be in the spirit of this version, but may differ in detail to address new problems or concerns. New versions will be published with a unique version number and a variant identifier specifying the variant. If the Licensor has specified that a given variant applies to the Covered Source without specifying a version, You may treat that Covered Source as being released under any version of the CERN-OHL with that variant. If no variant is specified, the Covered Source shall be treated as being released under CERN-OHL-S. The Licensor may also specify that the Covered Source is subject to a specific version of the CERN-OHL or any later version in which case You may apply this or any later version of CERN-OHL with the same variant identifier published by CERN. 8.4 This Licence shall terminate with immediate effect if You fail to comply with any of its terms and conditions. 8.5 However, if You cease all breaches of this Licence, then Your Licence from any Licensor is reinstated unless such Licensor has terminated this Licence by giving You, while You remain in breach, a notice specifying the breach and requiring You to cure it within 30 days, and You have failed to come into compliance in all material respects by the end of the 30 day period. Should You repeat the breach after receipt of a cure notice and subsequent reinstatement, this Licence will terminate immediately and permanently. Section 6 shall continue to apply after any termination. 8.6 This Licence shall not be enforceable except by a Licensor acting as such, and third party beneficiary rights are specifically excluded. ## /README.md # Echo: Open Hardware Music Player Echo is an open hardware platform for music players. The goal of the project is to produce a high quality music player, based on and designed with free software. It's primarily designed to run [Rockbox](https://www.rockbox.org), a free music player firmware with support for many codecs, and a wide array of features. KiCAD 8.0 was used for the electrical design and PCB layout. The planned 3D-printable case will be designed using FreeCAD. The designs themselves are available under the CERN-OHL-S v2 license. The current version of the Echo player is called the Echo R1. In the future, there could be new player models if there are significant changes to the features or form factor, but old models will always be supported. ## Echo R1 ![3D render of Echo R1 case](/images/echo-r1.png) - Size: 60x100x15mm (approx) - Weight: TBD The R1 has a 4-way D-pad and 6 multi-function buttons on the faceplate, which can be used to quickly navigate your music library and control playback. There are dedicated volume and power buttons (not pictured), and a sliding hold switch near the power button, which locks the buttons against accidental presses when the player is in your pocket or bag. There are two 3.5mm jacks, one for headphones, and one true line-out port. The headphone jack supports recording from an in-line microphone and playback control by an in-line remote. Both jacks can be used simultaneously. The removable memory card slot allows up to 2 TiB of storage for your music and files. The USB-C port is used for charging and file transfer, and supports high-speed USB 2.0. The battery socket accepts the widely available BL-5C battery, and the battery can easily be replaced without special tools when it starts to wear out. ### Hardware specifications | Component | Description | | ------------- | ----------------------------------------- | | CPU | STM32H743 @ 480 MHz | | Memory | 32 MiB SDRAM @ 120 MHz | | Audio | TLV320AIC3104, up to 96 KHz, 0.707 V RMS | | Display | 18-bit, 320x240, 2.3 inch LCD | | Storage | Expandable external memory card slot | | USB | USB 2.0 @ 480 Mbps (High-speed) | | Headphone out | Yes (3.5mm jack) | | Line out | Yes (3.5mm jack) | | Microphone | Can use wired headphone mic | | RTC | Yes, with wake-up alarm function | | Battery | Replaceable BL-5C battery (~1000 mAH) | ### Status The Rev1 prototype PCB is complete but has some problems (see the list of known issues below). A 3D-printable case for the Rev1 is planned, but CAD files aren't available yet. Development is currently focused on two areas: - Porting Rockbox to the Rev1 board to identify any issues with the hardware design. - Designing a case to test general usability and ergonomics, and find issues with the mechanical design of the PCB. The next revision will be focused on addressing issues from Rev1. ### Known issues - The backlight cannot be disabled, power is supplied to the LEDs even when the boost converter is disabled. - The current limit on the backlight LED driver is set too low (20 mA paralleled to 4 LEDs, should be 20 mA per LED). - Reference designators in the schematics don't make much sense, there are gaps in the numbering and samed-valued components are not in contiguous ranges. ## License Unless otherwise noted, all files in this repository, including this README, are available under the terms of the CERN-OHL-S version 2 license, which should be found in the file `COPYING.txt` alongside this README; or at . ## Credits Copyright (C) 2024-2025 Aidan MacDonald ## /docs/bom.ods Binary file available at https://raw.githubusercontent.com/amachronic/echoplayer/refs/heads/main/docs/bom.ods ## /docs/hardware.md # Hardware notes Usage notes for the hardware -- for further information consult the KiCAD schematic and `pin_assign.ods` file. ## Fast/slow charging mode To enable 450 mA charging, `~charging_enable` must be pulled to ground, otherwise the charge is limited to 100 mA. This isn't strictly USB 2.0 compliant but provides an option to draw less current when plugging into weak USB hosts (eg. a phone). ## Power-on circuit management The power-on circuit controls the main 3.3V regulator enable pin and thus is used to power on the STM32 MCU. There are 4 power-on signals which are active high and OR'd through diodes: * CPU power (`cpu_power_on` pin) * RTC wakeup (`rtc_wakeup` pin) * Power button * VBUS input In the normal case, the user will press and hold the power button to power on the machine. Once the STM32 boots, the bootloader continues to monitor the button, and if it stays pressed for a certain duration it will assert the `cpu_power_on` request to keep the CPU powered on once the power button is released. The RTC wakeup case is much like the power button case, except that the bootloader detects the RTC wakeup and boots the firmware with no user input. Providing USB power ensures the STM32 is powered even if there is no software on it. This allows it to be flashed over SWD or USB-DFU. To shut off the CPU, the firmware should drive `cpu_power_on` low and wait for some time. It should then trigger a software reset in order to re-enter the bootloader. If the bootloader is re-entered in this way it should go into an idle mode to manage battery charging, etc, which should appear as if the device is 'off' from the user perspective and respond as expected to the power button / RTC alarm. If USB power is lost, the bootloader should attempt to shut off the system again. ## Audio codec and jacks There are two 3.5mm audio jacks driven by the TLV320AIC3104 codec: - Headphone jack -- direct-coupled (capless) headphone amp output - Line-out jack -- AC-coupled line output Both jacks have insert detection and can be driven simultaneously. The headphone jack supports recording from an inline microphone and headset button detection following the Android 3.5mm accessory spec. Both jacks are designed for the CTIA pinout and support 4-pin CTIA and 3-pin plugs; 4-pin OMTP plugs may not work correctly. ## USB-DFU mode and SWD The STM32 can be programmed using USB DFU mode by holding SELECT while inserting a USB cable. This will enter the ST bootloader and it should appear as a USB-DFU device. The 6-pin SWD connector can be used to debug and program the STM32 using OpenOCD. This requires an SWD adapter such as the STLINK-V3SET. The default configuration files for the STM32H743 and your adapter should be sufficient, no special configuration is required. Note that software breakpoints in GDB will not work correctly on Cortex-M7 when the I-cache is enabled, due a bug in OpenOCD. To work around this, you can use GDB's `hbreak` command to force the use of hardware breakpoints or you can disable the I-cache. ## Board stackup and ordering information The board is designed for JLCPCB's 6-layer JLC06101H-3313 stackup. Trace widths have been selected to get 50-ohm impedance on single ended signal traces and 90-ohm differential impedance on USB. Via impedance wasn't taken into account as it shouldn't matter except at much higher speeds. For QFN exposed pads the grounding vias in the KiCAD footprint are smaller than the min. size used on the rest of the board. It should be fine to enlarge them to the standard via size if required but JLCPCB seemed to accept them as-is. | Parameter | Value | | -------------------- | --------------------- | | Layers | 6 | | Thickness | 1.6mm | | Material | FR-4 TG155 | | Outer copper weight | 1 oz | | Inner copper weight | 0.5 oz | | Impedance controlled | Yes | | Stackup | JLC06101H-3313 | | Via covering | Epoxy filled & capped | | Via pad/hole size | 0.45mm/0.3mm | ## /docs/pin_assign.ods Binary file available at https://raw.githubusercontent.com/amachronic/echoplayer/refs/heads/main/docs/pin_assign.ods ## /echo-r1/audio.kicad_sch ```kicad_sch path="/echo-r1/audio.kicad_sch" (kicad_sch (version 20231120) (generator "eeschema") (generator_version "8.0") (uuid "c96fdeaf-b9c4-4ce0-899f-3e0f3edab655") (paper "A4") (title_block (title "Audio CODEC & 3.5mm jacks") (date "2024-11-14") (rev "Rev1") (comment 1 "Author: Aidan MacDonald") ) (lib_symbols (symbol "Connector_Audio:AudioJack4" (exclude_from_sim no) (in_bom 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(end 81.28 68.58) (stroke (width 0) (type default) ) (fill (type none) ) (uuid fe2961cf-8924-42c9-afa5-784f824c7c44) ) (text "HEADPHONE JACK" (exclude_from_sim no) (at 175.514 43.942 0) (effects (font (size 1.27 1.27) ) (justify left top) ) (uuid "081c938f-adf8-42cc-9601-b33ae50b6196") ) (text "CODEC AVDD DECOUPLING" (exclude_from_sim no) (at 145.034 43.942 0) (effects (font (size 1.27 1.27) ) (justify left top) ) (uuid "172410f0-7174-42f4-a45a-ca15dcd04847") ) (text "CODEC AVDD/DRVDD SWITCH" (exclude_from_sim no) (at 53.594 16.764 0) (effects (font (size 1.27 1.27) ) (justify left) ) (uuid "19aca5a5-05ee-44cd-bd00-0d19e271011b") ) (text "CODEC DRVDD DECOUPLING\nPlace near pin 24" (exclude_from_sim no) (at 114.554 43.942 0) (effects (font (size 1.27 1.27) ) (justify left top) ) (uuid "2568900a-5b44-4e9f-aba7-1b2d3e029fcc") ) (text "Headphone detection is done\nover I2C using the codec's\ninbuilt detection function" (exclude_from_sim no) (at 214.63 53.34 0) (effects (font (size 1.27 1.27) ) ) (uuid "43898881-d482-4563-b360-cc423443be20") ) (text "CODEC DVDD DECOUPLING" (exclude_from_sim no) (at 53.594 43.942 0) (effects (font (size 1.27 1.27) ) (justify left top) ) (uuid "4397604d-bbe5-4d22-a2ac-9ab50208ab9b") ) (text "LINE-OUT JACK" (exclude_from_sim no) (at 175.514 107.442 0) (effects (font (size 1.27 1.27) ) (justify left top) ) (uuid "48a7c7f3-719b-42e5-85b6-0c43e4ec1862") ) (text "CODEC IOVDD DECOUPLING" (exclude_from_sim no) (at 84.074 43.942 0) (effects (font (size 1.27 1.27) ) (justify left top) ) (uuid "6fed570f-4d34-4256-b5cf-3e8d581f163d") ) (text "Since the jack's ground is HPCOM (1.35V), micbias\nshould always be connected to AVDD (3.3V) to give\na sufficient bias voltage." 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yes) ) ) (property "LCSC#" "C5199223" (at 223.52 146.05 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "7ea31e18-5dc0-47cf-8860-af164cdd2d87") ) (pin "3" (uuid "a900b8a2-bfb6-4bf9-8ddd-ce4192eaf1fe") ) (pin "1" (uuid "5f1b524f-6964-4a2d-97e6-6360710f549a") ) (instances (project "" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "D11") (unit 1) ) ) ) ) (symbol (lib_id "power:GND") (at 210.82 151.13 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "d57cbc3c-6342-4501-b50e-681961661fcd") (property "Reference" "#PWR06" (at 210.82 157.48 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Value" "GND" (at 210.82 156.21 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 210.82 151.13 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "" (at 210.82 151.13 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Power symbol creates a global label with name \"GND\" , ground" (at 210.82 151.13 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "1" (uuid "3aa28811-151b-4171-b55e-ae0b51700af4") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "#PWR06") (unit 1) ) ) ) ) (symbol (lib_id "power:GND") (at 73.66 157.48 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "d59e47d6-7130-4559-b9b5-eb010bc515fd") (property "Reference" "#PWR044" (at 73.66 163.83 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Value" "GND" (at 73.66 162.56 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 73.66 157.48 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "" (at 73.66 157.48 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Power symbol creates a global label with name \"GND\" , ground" (at 73.66 157.48 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "1" (uuid "0e1e9c02-648b-4c46-bc86-44714e836eac") ) (instances (project "" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "#PWR044") (unit 1) ) ) ) ) (symbol (lib_id "Device:Q_PMOS_GSD") (at 83.82 27.94 270) (mirror x) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (uuid "e08163de-ebb7-4b15-a9de-fbe0a80fa8bb") (property "Reference" "Q6" (at 83.82 19.05 90) (effects (font (size 1.27 1.27) ) ) ) (property "Value" "AO3401A" (at 83.82 21.59 90) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "Package_TO_SOT_SMD:SOT-23" (at 86.36 22.86 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "https://www.lcsc.com/datasheet/lcsc_datasheet_2311091734_UMW-Youtai-Semiconductor-Co---Ltd--AO3401A_C347476.pdf" (at 83.82 27.94 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "P-MOSFET transistor, gate/source/drain" (at 83.82 27.94 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "C347476" (at 83.82 27.94 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "6cb0e2d6-816f-4ce6-8ae4-ff42473a5b1a") ) (pin "1" (uuid "8bb74dd7-6a3b-40b4-809f-6cc5a9125e99") ) (pin "3" (uuid "fabaf504-44d4-4461-8b2f-a711d59892b9") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "Q6") (unit 1) ) ) ) ) (symbol (lib_id "echoplayer:CESD3V3AP-ES") (at 208.28 86.36 90) (mirror x) (unit 2) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (uuid "e7ce243b-4783-49b0-aeb6-9d1571a0aba9") (property "Reference" "D7" (at 209.55 88.646 90) (effects (font (size 1.27 1.27) ) (justify left) (hide yes) ) ) (property "Value" "CESD3V3AP-ES" (at 205.74 87.3759 90) (effects (font (size 1.27 1.27) ) (justify left) (hide yes) ) ) (property "Footprint" "Package_TO_SOT_SMD:SOT-23" (at 203.2 86.36 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "https://www.lcsc.com/datasheet/lcsc_datasheet_2409051031_ElecSuper-CESD3V3AP-ES_C5199223.pdf" (at 213.36 86.36 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Unidirectional dual ESD protection diode array, 3.3V, Common Anode, SOT-23" (at 208.28 86.36 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "C5199223" (at 208.28 86.36 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "0704511a-37c8-469e-b978-0faec3028208") ) (pin "3" (uuid "92d19432-bfb2-44a1-a737-3ae526e349ca") ) (pin "1" (uuid "c50ade96-173e-4dfe-85ab-7fbe6f850e2b") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "D7") (unit 2) ) ) ) ) (symbol (lib_id "power:GND") (at 134.62 149.86 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "eaaabffa-f27e-4531-9df4-5ba7d14dbdcd") (property "Reference" "#PWR056" (at 134.62 156.21 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Value" "GND" (at 134.62 154.94 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 134.62 149.86 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "" (at 134.62 149.86 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Power symbol creates a global label with name \"GND\" , ground" (at 134.62 149.86 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "1" (uuid "90f93413-59d2-4563-aa07-ebbd2b9b5bec") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "#PWR056") (unit 1) ) ) ) ) (symbol (lib_id "Device:R_Small_US") (at 73.66 152.4 0) (mirror y) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (uuid "f16e872e-6fdc-4ca1-b213-567d647939ef") (property "Reference" "R20" (at 71.12 151.1299 0) (effects (font (size 1.27 1.27) ) (justify left) ) ) (property "Value" "100 kΩ" (at 71.12 153.6699 0) (effects (font (size 1.27 1.27) ) (justify left) ) ) (property "Footprint" "Resistor_SMD:R_0402_1005Metric" (at 73.66 152.4 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 73.66 152.4 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Resistor, small US symbol" (at 73.66 152.4 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "C60491" (at 73.66 152.4 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "1" (uuid "bc8de24b-f91e-4459-8bdd-7e17fdadce7e") ) (pin "2" (uuid "96409099-fea0-43da-ae3f-e23f88b5c4a2") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "R20") (unit 1) ) ) ) ) (symbol (lib_id "power:GND") (at 104.14 160.02 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "f3510d49-8f41-4723-ac03-13c4e098e04d") (property "Reference" "#PWR046" (at 104.14 166.37 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Value" "GND" (at 104.14 165.1 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 104.14 160.02 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "" (at 104.14 160.02 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Power symbol creates a global label with name \"GND\" , ground" (at 104.14 160.02 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "1" (uuid "0e46e7bd-abdd-4fc1-8c8f-0bfdfefc806a") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "#PWR046") (unit 1) ) ) ) ) (symbol (lib_id "power:GND") (at 127 60.96 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "f5e5dca4-881b-4a2c-8d9f-3cd61de0844f") (property "Reference" "#PWR047" (at 127 67.31 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Value" "GND" (at 127 66.04 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 127 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "" (at 127 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Power symbol creates a global label with name \"GND\" , ground" (at 127 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "1" (uuid "a114a690-8b3c-4724-a6d9-52413dad43c2") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "#PWR047") (unit 1) ) ) ) ) (symbol (lib_id "power:GND") (at 66.04 60.96 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "fa235573-4662-4d9e-ab7e-441c0554601c") (property "Reference" "#PWR043" (at 66.04 67.31 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Value" "GND" (at 66.04 66.04 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 66.04 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "" (at 66.04 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Power symbol creates a global label with name \"GND\" , ground" (at 66.04 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "1" (uuid "58910b15-6135-414f-94ff-92710b6ffb70") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "#PWR043") (unit 1) ) ) ) ) (symbol (lib_id "power:GND") (at 96.52 60.96 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "fb739de5-7e2b-48df-9b38-1e151984a9c2") (property "Reference" "#PWR045" (at 96.52 67.31 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Value" "GND" (at 96.52 66.04 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 96.52 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "" (at 96.52 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Power symbol creates a global label with name \"GND\" , ground" (at 96.52 60.96 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "1" (uuid "5e01c90e-4e8b-484c-9a8b-636d0ffb2472") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/dae5d6c8-3920-4253-a171-1dbab60b78bd" (reference "#PWR045") (unit 1) ) ) ) ) ) ``` ## /echo-r1/buttons.kicad_sch ```kicad_sch path="/echo-r1/buttons.kicad_sch" (kicad_sch (version 20231120) (generator "eeschema") (generator_version "8.0") (uuid "8f4aee07-e845-43ad-99fa-ff16a8612b78") (paper "A4") (title_block (title "Buttons") (date "2024-11-14") (rev "Rev1") (comment 1 "Author: Aidan MacDonald") ) (lib_symbols (symbol "Switch:SW_Push" (pin_numbers hide) (pin_names (offset 1.016) hide) (exclude_from_sim no) (in_bom yes) (on_board yes) (property "Reference" "SW" (at 1.27 2.54 0) (effects (font (size 1.27 1.27) ) (justify left) ) ) (property "Value" "SW_Push" (at 0 -1.524 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 0 5.08 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 0 5.08 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Push button switch, generic, two pins" (at 0 0 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "ki_keywords" "switch normally-open pushbutton push-button" (at 0 0 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (symbol "SW_Push_0_1" (circle (center -2.032 0) (radius 0.508) (stroke (width 0) (type default) ) (fill (type none) ) ) (polyline (pts (xy 0 1.27) (xy 0 3.048) ) (stroke (width 0) (type default) ) (fill (type none) ) ) (polyline (pts (xy 2.54 1.27) (xy -2.54 1.27) ) (stroke (width 0) (type default) ) (fill (type none) ) ) (circle (center 2.032 0) (radius 0.508) (stroke (width 0) (type default) ) (fill (type none) ) ) (pin passive line (at -5.08 0 0) (length 2.54) (name "1" (effects (font (size 1.27 1.27) ) ) ) (number "1" (effects (font (size 1.27 1.27) ) ) ) ) (pin passive line (at 5.08 0 180) (length 2.54) (name "2" (effects (font (size 1.27 1.27) ) ) ) (number "2" (effects (font (size 1.27 1.27) ) ) ) ) ) ) (symbol "echoplayer:SW_Push_MountingPin" (pin_names (offset 1.016) hide) (exclude_from_sim no) (in_bom yes) (on_board yes) (property "Reference" "SW" (at 4.318 2.032 0) (effects (font (size 1.27 1.27) ) (justify left) ) ) (property "Value" "SW_Push_MountingPin" (at 0 4.572 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "" (at 0 5.08 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 0 5.08 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Generic push-button switch, two contact pins and shield pin(s)" (at 0 0 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "ki_keywords" "switch normally-open pushbutton momentary" (at 0 0 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (symbol "SW_Push_MountingPin_0_1" (circle (center -2.032 0) (radius 0.508) (stroke (width 0) (type default) ) (fill (type none) ) ) (polyline (pts (xy 0 1.27) (xy 0 3.048) ) (stroke (width 0) (type default) ) (fill (type none) ) ) (polyline (pts (xy 1.27 -1.524) (xy -1.27 -1.524) ) (stroke (width 0) (type default) ) (fill (type none) ) ) (polyline (pts (xy 2.54 1.27) (xy -2.54 1.27) ) (stroke (width 0) (type default) ) (fill (type none) ) ) (polyline (pts (xy 0.508 2.54) (xy 3.048 2.54) (xy 3.048 -1.143) (xy -3.048 -1.143) (xy -3.048 2.54) (xy -0.508 2.54) ) (stroke (width -0.0254) (type default) ) (fill (type none) ) ) (polyline (pts (xy 0.508 2.54) (xy 3.048 2.54) (xy 3.048 -1.143) (xy -3.048 -1.143) (xy -3.048 2.54) (xy -0.508 2.54) ) (stroke (width 0.254) (type default) ) (fill (type none) ) ) (circle (center 2.032 0) (radius 0.508) (stroke (width 0) (type default) ) (fill (type none) ) 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"echoplayer:SW_Push_MountingPin") (at 210.82 121.92 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "8e769640-b2fc-4f40-a93f-84dfe24c751d") (property "Reference" "SW8" (at 210.82 114.3 0) (effects (font (size 1.27 1.27) ) ) ) (property "Value" "VOL-" (at 210.82 116.84 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "echoplayer:Switch_XKB_TS-1010-C-A" (at 210.82 116.84 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 210.82 116.84 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Generic push-button switch, two contact pins and shield pin(s)" (at 210.82 121.92 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "C318941" (at 210.82 121.92 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "8567cce0-81c3-40c8-aaca-5e2675c7dc63") ) (pin "1" (uuid "99aa73d9-5e08-4dc5-878b-aa0373ef934a") ) (pin "MP" (uuid "d93249bc-b3b8-45f4-b4e3-0d5d99a62ee8") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/6b02ec5e-a793-4374-8df4-66bff795e3fc" (reference "SW8") (unit 1) ) ) ) ) (symbol (lib_id "Switch:SW_Push") (at 160.02 116.84 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "aef9f068-eb64-4771-94df-ca60f509f082") (property "Reference" "SW4" (at 160.02 109.22 0) (effects (font (size 1.27 1.27) ) ) ) (property "Value" "DPAD→" (at 160.02 111.76 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "echoplayer:Switch_ContactPad_10x3mm_Cross" (at 160.02 111.76 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 160.02 111.76 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Push button switch, generic, two pins" (at 160.02 116.84 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "" (at 160.02 116.84 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "1d6116f3-0f99-47fd-bb88-d63b2e5f64ac") ) (pin "1" (uuid "d624b2f6-e9ca-4298-becb-13383c84b66a") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/6b02ec5e-a793-4374-8df4-66bff795e3fc" (reference "SW4") (unit 1) ) ) ) ) (symbol (lib_id "Switch:SW_Push") (at 114.3 116.84 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "b1c57765-ba64-48c6-ba26-052ffd347a0c") (property "Reference" "SW11" (at 114.3 109.22 0) (effects (font (size 1.27 1.27) ) ) ) (property "Value" "Y" (at 114.3 111.76 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "echoplayer:Switch_ContactPad_10x3mm_Cross" (at 114.3 111.76 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 114.3 111.76 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Push button switch, generic, two pins" (at 114.3 116.84 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "" (at 114.3 116.84 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "bb9f1fe7-05c5-4b23-8fbc-57db7e733563") ) (pin "1" (uuid "8bc3fae2-bbf6-479b-aa44-5e867dd92979") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/6b02ec5e-a793-4374-8df4-66bff795e3fc" (reference "SW11") (unit 1) ) ) ) ) (symbol (lib_id "Switch:SW_Push") (at 160.02 106.68 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "ef5a7af2-a155-40aa-aee5-a4f64b595d0d") (property "Reference" "SW3" (at 160.02 99.06 0) (effects (font (size 1.27 1.27) ) ) ) (property "Value" "DPAD←" (at 160.02 101.6 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "echoplayer:Switch_ContactPad_10x3mm_Cross" (at 160.02 101.6 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 160.02 101.6 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Push button switch, generic, two pins" (at 160.02 106.68 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "" (at 160.02 106.68 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "6b3587fc-9587-438b-a578-5d291a1e081f") ) (pin "1" (uuid "8004e82c-446b-4614-8b3c-9b176fb36411") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/6b02ec5e-a793-4374-8df4-66bff795e3fc" (reference "SW3") (unit 1) ) ) ) ) (symbol (lib_id "Switch:SW_Push") (at 114.3 86.36 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "f152aa34-b6d8-4234-88f4-4215542d9f9d") (property "Reference" "SW5" (at 114.3 78.74 0) (effects (font (size 1.27 1.27) ) ) ) (property "Value" "A" (at 114.3 81.28 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "echoplayer:Switch_ContactPad_10x3mm_Cross" (at 114.3 81.28 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 114.3 81.28 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Push button switch, generic, two pins" (at 114.3 86.36 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "" (at 114.3 86.36 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "1a3de16a-47fb-483b-8452-31720321c0c8") ) (pin "1" (uuid "da341181-ea8e-41fe-b0ff-bf690199d823") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/6b02ec5e-a793-4374-8df4-66bff795e3fc" (reference "SW5") (unit 1) ) ) ) ) (symbol (lib_id "Switch:SW_Push") (at 160.02 96.52 0) (unit 1) (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes) (uuid "fede7971-518b-40c2-b2ee-4b42ae819d8d") (property "Reference" "SW2" (at 160.02 88.9 0) (effects (font (size 1.27 1.27) ) ) ) (property "Value" "DPAD↓" (at 160.02 91.44 0) (effects (font (size 1.27 1.27) ) ) ) (property "Footprint" "echoplayer:Switch_ContactPad_10x3mm_Cross" (at 160.02 91.44 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Datasheet" "~" (at 160.02 91.44 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "Description" "Push button switch, generic, two pins" (at 160.02 96.52 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (property "LCSC#" "" (at 160.02 96.52 0) (effects (font (size 1.27 1.27) ) (hide yes) ) ) (pin "2" (uuid "95a4c5c6-1e44-4c1b-82d2-7725d5b901e6") ) (pin "1" (uuid "43448fe2-9f22-4c4a-8bea-36d237d46d0a") ) (instances (project "echo-r1" (path "/aa241847-30f4-429d-a148-6a6e39ba98e0/6b02ec5e-a793-4374-8df4-66bff795e3fc" (reference "SW2") (unit 1) ) ) ) ) ) ``` The content has been capped at 50000 tokens, and files over NaN bytes have been omitted. 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