2 layers168 × 109.2 mm
2 layers91.5 × 45 mm
CASE keypad
CASE-Association/CASE_keypad42x3 Keypad kit
- Size
- 91.5 × 45 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 41
- Pads
- 140
- Tracks, vias
- 276, 20
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 29 Apr 2021
- Updated
- 10 Oct 2022
Overview
CASE keypad is an open-source printed circuit board by CASE-Association, from the CASE-Association/CASE_keypad repository on GitHub, published under the MIT licence. It is a 2-layer board of 91.5 × 45 mm with 35 parts on 41 nets, routed with 276 tracks and 20 vias.
It is built around the ATMEGA32U2-AU and TYPE-C-31-M-12. Its parts include 8 switches, 6 diodes, 1 IC and 1 connector. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA32U2-AU
TQFP-32(7x7)-40℃~+85℃ 16MHz 1KB 1KB 2.7V~5.5V 22 32KB 8 Bit AVR Built-in FLASH Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、External pin reset (NRST)、Built-in general-purpose timer、Programmable watchdog TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontroller Units (MCUs/MPUs/SOCs)
TYPE-C-31-M-12
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 7.35mm Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
README.mdCASE keypad
2x3 Keypad kit
Assembly instructions
This kit requires SMD soldering of 0805 components and a QFP microcontroller. See this for quick guide in hand-soldering SMD components Recommended soldering order:
- Diodes
- Resistors/Capacitors
- Pushbutton
- Microcontroller
- USB-C
- Crystal
- Switches/Encoder (Test and flash before soldering!)
Diodes have to be soldered in correct orientation. White line facing downwards.
Dot on microcontroller should align with white dot on PCB.
Rest of the components can be soldered in arbitrary orientation.
The keypad can be tested and flashed after soldering the crystal.
- Plug in to computer
- Check device manager for ATmega32u2
- Keypad is working and ready for flashing if ATmega32u2 is detected
- Proceed to flashing
Flashing
- Download and open QMK Toolbox
- Select the provided .HEX file
- Choose ATMega32u2 as microcontroller
- Push reset button on board and then press flash button in toolbox
Keypad should be flashed and ready to test. Use a jumper wire or tweezers to short the switch pins. The keypad should print numbers 1 to 6.
If flashing does not work, try using v0.0.21 of QMK toolbox
You can now solder the switches/encoder. Encoder is optional and can only be soldered in either top corner (ONLY ONE).
Keybinds
- Download and install VIA Configurator (select .exe for windows)
- Open VIA and go to File->Import Keymap
- Select the file via.json
- Plug in the keypad
The keybinds can now be configured.
Troubleshooting
Unknown USB device
This is a common problem. Plug in the keyboard and open the device manager. The keyboard should show up as ATmega32U2, if it instead shows up as unknown device, something is wrong. Follow these steps:
- Check that the USB-C connector has no shorts and all pads are connected. It can be good to retouch the connection even if no obvious problem can be found.
- Do the same thing for the microcontroller chip.
- Also check that the resistors are soldered properly.
- Check the rest of the components.
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | D_Small | Diode_SMD:D_SOD-123 | D2, D3, D4, D5, D6, D7 |
| 6 | SW_KEYSW | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW3, SW4, SW5, SW6, SW8, SW9 |
| 2 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | 0.1uf, 0.1uf |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | 10k, 10k |
| 2 | 22 pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | 22pf, 22pf |
| 2 | 22R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | 22R, 22R |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | 5.1k, 5.1k |
| 2 | Encoder | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW2, SW7 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | 10uf |
| 1 | 16 MHz | Crystal:Crystal_HC49-4H_Vertical | 16 MHz |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | 1uf |
| 1 | ATmega32U2-AU | Package_QFP:TQFP-32_7x7mm_P0.8mm | U1 |
| 1 | LOGO | logo:case_head_9x5mm | G*** |
| 1 | RESET | Button_Switch_SMD:SW_SPST_SKQG_WithStem | RESET |
| 1 | TYPE-C-31-M-12 | usb_c:HRO_TYPE-C-31-M-12 | J1 |
The 31 most common of 35 parts.
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Questions
How big is the CASE keypad PCB?
It measures 91.5 × 45 mm and has 2 copper layers, 1.6 mm thick.
What parts does the CASE keypad use?
35 parts, built around the ATMEGA32U2-AU and TYPE-C-31-M-12. 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 CASE keypad KiCad files?
From the CASE-Association/CASE_keypad repository on GitHub, at the commit this page was made from: the board is Hardware/case_keypad/case_keypad.kicad_pcb and its schematic Hardware/case_keypad/case_keypad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CASE keypad 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).