USB keyboard to PS/2+AT or XT interface converter using a Raspberry Pi Pico
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Keyboard + Mouse variant: https://github.com/No0ne/ps2x2pico
- Download
ps2pico.uf2orps2pico-XT.uf2from https://github.com/No0ne/ps2pico/releases - Copy
ps2pico.uf2orps2pico-XT.uf2to your Pi Pico by pressing BOOTSEL before pluggging in. - Afterwards connect a USB keyboard using an OTG-adapter and PS/2+AT or XT 5V to Pico VBUS.
- Also works with wireless keyboards with a dedicated USB receiver.
- 3.3V/5V conversion is done with two NPN transistors, two zener diodes and four resistors as shown below:
PS/2+AT / XT CLOCK
| ____
|__________|10k |___________ GPIO 14
____ | |____| |
GPIO 15 ___|2k2 |____|/ BC547 __|__
|____| |\e / \ 3V6
| |
____|__GND________________|___
PS/2+AT / XT DATA
| ____
|_________|10k |____________ GPIO 17
____ | |____| |
GPIO 16 ___|2k2 |____|/ BC547 __|__
|____| |\e / \ 3V6
| |
____|__GND________________|___
If you have a NuXTv2 you can build an internal version of the ps2pico-XT! Replace U10 with the pico, remove RN13 and add two 4k7 pull-up resistors as shown below:
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export PICO_SDK_PATH=/path/to/pico-sdk
mkdir build
cd build
cmake ..
make
- https://wiki.osdev.org/PS/2_Keyboard
- https://github.com/Harvie/ps2dev/blob/master/src/ps2dev.cpp
- http://www.lucadavidian.com/2017/11/15/interfacing-ps2-keyboard-to-a-microcontroller/
- https://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/translate.pdf
- https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-XT-Keyboard-Protocol
- https://github.com/AndersBNielsen/pcxtkbd/blob/master/XT_KEYBOARD.ino
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