2 layers80 × 37.5 mm
National Keyboard Mux Board
SteveCooling/MidiKeys
Will be a complete board with decoders for multiplexed sampling of analog sources and up to 61-key keybeds
43 parts8MIT
2 layers166 × 70 mm
Prototype
SteveCooling/MidiKeys8Will be a complete board with decoders for multiplexed sampling of analog sources and up to 61-key keybeds
- Size
- 166 × 70 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 75
- Nets
- 123
- Pads
- 402
- Tracks, vias
- 919, 106
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 24 Feb 2020
- Updated
- 8 May 2022
Overview
Prototype is an open-source printed circuit board by SteveCooling, from the SteveCooling/MidiKeys repository on GitHub, published under the MIT licence. It is a 2-layer board of 166 × 70 mm with 75 parts on 123 nets, routed with 919 tracks and 106 vias.
It is built around the ATMEGA32U4-AU, LMV358 and 74HC138, with the 74HC238D, 74HC04D and AMS1117-5.0 among its other parts. Its parts include 20 connectors, 15 resistors, 13 diodes, 10 ICs and 5 capacitors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
12
ATMEGA32U4-AU
QFP-44(10x10)-40℃~+85℃ 10bit 16MHz 1KB 2.5KB 2.7V~5.5V 26 32KB 8 Bit AVR Built-in FLASH QFP-44(10x10) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LMV358
SOP-8-40℃~+125℃ 10pA 10pA 1MHz 2 2.5V~5.5V 20mA 20nV/√Hz@10kHz 2uV/℃ 40uA 5mV 600V/ms 65dB EMI filtering/RF suppression Rail-to-Rail Input, Rail-to-Rail Output SOP-8 Operational Amplifier ROHSTECH PUBLICOperational Amplifier
74HC138
SOP-160℃~+70℃ 24ns@5.0V,16pF 2V~6V 3/8 5.2mA 5.2mA 5uA 74HC Decoder Reverse function Single Supply SOP-16 Signal Switches, Multiplexers, Decoders ROHSGRSignal Switches, Multiplexers, Decoders74HC238D
SOP-16SOP-16 Signal Switches, Multiplexers, Decoders ROHSMDDSignal Switches, Multiplexers, Decoders
74HC04D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV、400mV 14ns@6V,50pF 2V~6V 2uA 5.2mA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters
AMS1117-5.0
SOT-223-40℃~+125℃ 1 1.3V 15V 1A 5V 60dB Fixed Positive Short Circuit Protection、Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
HCPL-0600
SOP-8-40℃~+85℃ 1 10Mbps 4.5V~5.5V 5kV/us DC SOP-8 Logic Output Optoisolators ROHSonsemiLogic Output Optoisolators
BAV70
SOT-23-55℃~+150℃ 1 Pair Common Cathode 1.25V@150mA 2.5uA@70V 200mA 225mW 2A 6ns 70V SOT-23 Switching Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Switching Diodes
P6SMB6.8CA
SMB10.5V 1mA 5.8V 57.1A 6.45V 600W@10/1000us Bidirectional IEC 61000-4-2、IEC 61000-4-4 TVS SMB ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
1N914WT
SOD-523100V 150mW 1V@10mA 200mA 4ns 5uA@75V Independent SOD-523 Switching Diodes ROHSCBISwitching DiodesPMV48XP,215-VB
SOT-23MOSFETsVBsemi Elec
ZMM3V3
MiniMELF(LL-34)-55℃~+150℃ 1 Independent 2uA@1V 3.1V~3.5V 3.3V 500mW 600Ω 85Ω MiniMELF(LL-34) Zener Diodes ROHSYONGYUTAIZener Diodes
README
KiCad/Prototype/README.mdPrototype keyboard controller
Based on Arduino Leonardo (ATMEGA32U4)
:warning: NOT FINISHED
Will be a complete board with decoders for multiplexed sampling of analog sources and up to 61-key keybeds
Origins
This KiCad project is a derivative of the work found here: https://github.com/aspro648/Leonardo/
Bill Of Materials
:warning: This list is from the original project, needs update when the board is ready
-
1 ea., Perfect Purple PCB from OSH Park, with not so perfect layout from kicad.pcb file.
-
1 ea., U1 IC REG LINEAR 3.3V 150MA SOT23-5, LP2985-33DBVRG4, https://www.digikey.com/short/j29pqr
-
1 ea., U2 IC OPAMP GP 1MHZ RRO 8VSSOP, LM358DGKR, https://www.digikey.com/short/jnd53r
-
1 ea., U3 IC REG LINEAR 5V 1A SOT223 NCP1117ST50T3G, https://www.digikey.com/short/j29pqc
-
1 ea., U4 ATMEGA32U4-AU, IC MCU 8BIT 32KB FLASH 44TQFP, https://www.digikey.com/short/jb25pc
-
1 ea., Q1 MOSFET P-CH 20V 2A SSOT3, FDN340P, https://www.digikey.com/short/j29ppj
-
1 ea., Y1 CER RES 16.0000MHZ 15PF SMD, CSTCE16M0V53-R0, https://www.digikey.com/short/j2b9cm
-
2 ea., C1, C5 CAP CER 1UF SMD 0805
-
1 ea., C2 CAP CER 22pF SMD 0805
-
2 ea., C3, C6, C7 CAP CER 10UF 25V 1206, https://www.digikey.com/short/j29pwm
-
1 ea., C4 CAP CER 0.1UF SMD 0805
-
4 ea., D1-D4 SMD LED 0805, https://www.digikey.com/short/jwj4rb
-
1 ea., F1 PTC 1206, Bel 0ZCJ0025AF2E, https://www.digikey.com/short/jfcbc8
-
2 ea., RV1, RV2 VARISTOR VARISTOR 10.8V 40A 0805, https://www.digikey.com/short/jwj45d
-
4 ea., R1-R4 Resistor 1K OHM SMD 0805, https://www.digikey.com/short/j2d0wt
-
2 ea., R5, R8 Resistor 10K OHM SMD 0805, https://www.digikey.com/short/j2d0w4
-
2 ea., R6, R7 Resistor 22 OHM SMD 0805, https://www.digikey.com/short/jwj45j
-
1 ea., R9 Resistor 1M OHM SMD 0603,
-
1 ea., SW1 (yellow) SWITCH TACTILE SPST-NO 0.05A 12V, SW416-ND, https://www.digikey.com/short/jwj4m9
-
or (purple) KSEM31J LFS https://www.digikey.com/short/jnqh3m
-
1 ea., X3, CONN RCPT MICRO USB R/A SMD, Molex 1050170001, https://www.digikey.com/short/jb2205
-
1 ea., J1 Barrel Jack, https://www.digikey.com/short/j2fz43
-
1 ea., 6-Pin header, https://www.digikey.com/short/jwj4w4
-
2 ea., 8-Pin header, https://www.digikey.com/short/jwj4dp
-
1 ea., 10-Pin header, https://www.digikey.com/short/jwj4n7
-
1 ea., 2x3 Pin header, http://www.digikey.com/short/3m33n0
License
Attribution-ShareAlike 3.0 United States (CC BY-SA 3.0 US)
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
Under the following terms:
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
Parts
75| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | BAV70 | footprints:SOT-23 | D3, D6, D7, D8, D9, D10, D11, D13 |
| 4 | 10K | footprints:R_0805_HandSoldering | R5, R8, R11, R16 |
| 4 | 220 | footprints:C_0805_HandSoldering | R3, R13, R14, R15 |
| 3 | 10uF | footprints:C_1206_HandSoldering | C3, C6, C7 |
| 3 | 1K | footprints:R_0805_HandSoldering | R1, R2, R4 |
| 2 | 22 | footprints:R_0805_HandSoldering | R6, R7 |
| 2 | 74HC138 | footprints:SOIC-16_4.55x10.3mm_P1.27mm | U5, U6 |
| 2 | 74HC238 | footprints:SOIC-16_4.55x10.3mm_P1.27mm | U7, U8 |
| 2 | P6SMB6.8CA | Diode_SMD:D_SMB | RV1, RV2 |
| 2 | PULLUP | footprints:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP2, JP3 |
| 1 | 0 | footprints:R_1206_HandSoldering | F1 |
| 1 | 0.1uF | footprints:C_0805_HandSoldering | C4 |
| 1 | 10k/4k7 | footprints:SOIC-16_4.55x10.3mm_P1.27mm | RN2 |
| 1 | 16 Mhz | footprints:Resonator_SMD_CTSC_1.3mmx3.2mm | Y1 |
| 1 | 1M | footprints:R_0805_HandSoldering | R9 |
| 1 | 1N914WT | footprints:D_SOD-523 | D12 |
| 1 | 22nF | footprints:C_0805_HandSoldering | C2 |
| 1 | 4k7 | footprints:C_0805_HandSoldering | R10 |
| 1 | 4k7 | footprints:SOIC-16_4.55x10.3mm_P1.27mm | RN1 |
| 1 | 74HC04 | footprints:SOIC-14_3.9x8.7mm_P1.27mm | U9 |
| 1 | 74LS75 | footprints:SOIC-16_4.55x10.3mm_P1.27mm | U1 |
| 1 | AMS1117-5.0 | footprints:SOT-223-3_TabPin2 | U3 |
| 1 | ATMEGA32U4-AU | footprints:TQFP-44_10x10mm_Pitch0.8mm | U4 |
| 1 | BANK 0..7 | footprints:IDC-Header_2x08_P2.54mm_Vertical | J4 |
| 1 | BANK 8..15 | footprints:IDC-Header_2x08_P2.54mm_Vertical | J5 |
| 1 | BOOT | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1 |
| 1 | Barrel_Jack | footprints:BARREL_JACK | J1 |
| 1 | EXPRESSION | footprints:Jack_6.35mm_Amphenol_ACJS-MHDR | J6 |
| 1 | HCPL-0600 | footprints:SOIC-8_3.9x4.9mm_P1.27mm | U10 |
| 1 | ICSP | footprints:IDC-Header_2x03_P2.54mm_Vertical | J3 |
| 1 | LED_BUILTIN | footprints:LED_0805_HandSoldering | D4 |
| 1 | LMV358 | footprints:VSSOP-8_3.0x3.0mm_Pitch0.65mm | U2 |
| 1 | LOGO | footprints:bzzt-logo | G*** |
| 1 | MIDI IN | footprints:DIN_5_180Deg_PSG03463 | J15 |
| 1 | MIDI OUT | footprints:DIN_5_180Deg_PSG03463 | J16 |
| 1 | PD6/ADC9/SPEAKER | footprints:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J8 |
| 1 | PMV48XP,215 | footprints:SOT-23 | Q1 |
| 1 | POT 1 | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J9 |
| 1 | POT 2 | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J10 |
| 1 | POT 3 | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J11 |
| 1 | POT 4 | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J12 |
| 1 | POT 5 | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J13 |
| 1 | POT 6 | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J17 |
| 1 | POT 7 | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J18 |
| 1 | POT 8 | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J19 |
| 1 | PRESSURE | footprints:IDC-Header_2x06_P2.54mm_Vertical | J14 |
| 1 | PWR | footprints:LED_0805_HandSoldering | D1 |
| 1 | RESET | footprints:SW_SPST_PTS645 | SW1 |
| 1 | SUSTAIN | footprints:Jack_6.35mm_Amphenol_ACJM-MHDR | J7 |
| 1 | TTL MIDI | footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J20 |
| 1 | TX | footprints:LED_0805_HandSoldering | D2 |
| 1 | USB_B | footprints:USB_B_OST_USB-B1HSxx_Horizontal | J2 |
| 1 | ZMM3V3 | Diode_SMD:D_MiniMELF | D14 |
Questions
How big is the Prototype PCB?
It measures 166 × 70 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Prototype use?
75 parts, built around the ATMEGA32U4-AU, LMV358, 74HC138 and 74HC238D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Prototype KiCad files?
From the SteveCooling/MidiKeys repository on GitHub, at the commit this page was made from: the board is KiCad/Prototype/project.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Prototype design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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