2 layers305 × 144.2 mm
Keyboard
TM90/Keyboard
Have as much as possible open source? Also the tools used to build the keyboard
176 parts3
2 layers
Keyboard controller
TM90/Keyboard3Have as much as possible open source? Also the tools used to build the keyboard
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 57
- Nets
- 103
- Pads
- 275
- Tracks, vias
- 292, 16
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 9 Jun 2018
- Updated
- 31 Dec 2021
Overview
Keyboard controller is an open-source printed circuit board by TM90, from the TM90/Keyboard repository on GitHub. It is a 2-layer board with 57 parts on 103 nets, routed with 292 tracks and 16 vias.
It is built around the AT90USB1286-AU and LM1117-3.3. Its parts include 26 resistors, 11 capacitors, 5 transistors, 5 connectors and 4 ICs. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
AT90USB1286-AU
TQFP-64LQFP-64(14x14) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LM1117-3.3
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 3.3V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorised
README
README.mdDIY Mechanical Keyboard
Main Idea:
Have as much as possible open source? Also the tools used to build the keyboard
Tool usage:
- KiCAD (schematic, layout) (http://kicad.org/ )
- avr-gcc (https://gcc.gnu.org/wiki/avr-gcc )
- Export data for alu body from a layer in the KiCAD layout data
Electronic
Own layout and schematic but based on this project to keep compatibility with tmk firmware and qmk firmware:
https://github.com/tmk/HHKB_controller/blob/master/schematic/HHKB_controller_revG.pdf
Datasheets
Power
- LM1117 3.3V LDO http://cdn-reichelt.de/documents/datenblatt/A200/LM1117-TI.pdf
- NCP1402 step up DCDC Converter https://www.onsemi.com/pub/Collateral/NCP1402-D.PDF ->farnell: out of production - Alternative MAX1724 https://www.mouser.de/datasheet/2/256/MAX1722-MAX1724-97057.pdf but no Kicad Lib yet
- MCP 73831/2 Single Cell Lipo Charge Management Controller http://ww1.microchip.com/downloads/en/DeviceDoc/20001984g.pdf
Bluetooth
- RN42 Bluetooth Module http://ww1.microchip.com/downloads/en/DeviceDoc/50002328A.pdf
Microcontroller
- ATMEGA32U4 8 bit Microcontroller with USB http://ww1.microchip.com/downloads/en/devicedoc/atmel-7766-8-bit-avr-atmega16u4-32u4_datasheet.pdf
- AT90USB1286 8 bit Microcontroller with USB but more IO than ATMEGA32U4 http://ww1.microchip.com/downloads/en/DeviceDoc/doc7593.pdf
Mechanical
Sandwich case or alu bend case
Software/Firmware
Other:
http://www.keyboard-layout-editor.com/#/
Prototype for Switches without big PCB and description how to build a small keyboard: https://learn.sparkfun.com/tutorials/cherry-mx-switch-breakout-hookup-guide
Fullsize Keyboard matrix example with atmega32u4: https://easyeda.com/farmakon/GH80_3000-4f3cee521afd4be3858c4b5cc3b76f9e
Manufacturer:
PCB:
- beta layout https://de.beta-layout.com/leiterplatten/
- LiteOn https://www.leiton.de/index.html
- jlcpcb https://jlcpcb.com/
Mechanical:
Maybe using a front panel service for the keyboard front, aluminum or acrylic would be possible at beta layout
Parts
57| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5, R7, R8, R10, R11, R12, R14, R16, R20, R23, R24, R25, R26 |
| 6 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R4, R6, R19, R21, R22 |
| 4 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C2, C6, C7 |
| 3 | 15k | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R13, R15, R17 |
| 3 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D3, D4 |
| 3 | Q_NMOS_DGS | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q4 |
| 2 | 10u | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C10, C11 |
| 2 | 22 | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2, R3 |
| 2 | 22p | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C3, C4 |
| 2 | 4u7 | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C8, C9 |
| 2 | Q_PMOS_DGS | Package_TO_SOT_SMD:SOT-23 | Q3, Q5 |
| 1 | 0 | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R9 |
| 1 | 16MHz | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | 1u | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C5 |
| 1 | AT90USB1286-AU | Package_QFP:TQFP-64_14x14mm_P0.8mm | U1 |
| 1 | AVR-ISP-6 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J3 |
| 1 | Conn_01x03_Male | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal | J4 |
| 1 | Conn_02x11_Odd_Even | Connector_PinHeader_1.27mm:PinHeader_2x11_P1.27mm_Vertical | J1 |
| 1 | D_Schottky | Diode_SMD:D_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | LM1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U4 |
| 1 | MCP73832-3-OT | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | PROG | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R18 |
| 1 | RN42 | RF_Module:RN42 | U2 |
| 1 | SW_DPST | Button_Switch_SMD:SW_DIP_SPSTx02_Slide_6.7x6.64mm_W8.61mm_P2.54mm_LowProfile | SW1 |
| 1 | USB_C_Plug_USB2.0 | Connector_USB:USB_C_Receptacle_Amphenol_12401548E4-2A_CircularHoles | P1 |
Questions
What parts does the Keyboard controller use?
57 parts, built around the AT90USB1286-AU and LM1117-3.3. 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 Keyboard controller KiCad files?
From the TM90/Keyboard repository on GitHub, at the commit this page was made from: the board is electronics/keyboard_controller/keyboard_controller.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keyboard controller design in my own project?
Its repository states no licence, so its author keeps all rights: ask TM90 before reusing the design.
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