One-key-keyboard

Origin

This keyboard has one quite unique (but not orginal) feature, it can detect how hard key is pressed. At first i wanted to use coal trace (just like in potentiometer) but it's imposible to solder to coal and i didn't have time to order pcb. So new idea was born. Why not use fotoresistor and LED. Coal trace would work better for sure but i like this. Additionaly i added 0.96inch OLED display. EVERYTHING have to have screen nowadays.

Parts and stuff

• Raspberry pi pico
• 0.96 OLED
• Green LED
• Fotoresistor
• 1.5M ohm resistor
• 200 ohm resistor
• 3x M2 screewes
• 3x brass inserts
• 2x 4mm springs .stl and .step files are in parts folder

Schematic

Don't judge my painting skills. I was too lazy to make it in proper cad :)

Process

First design, not so bad but without screen

After a little bit of soldering...

5 total versions. Not so bad

Final result

better pics tomorrow

This keyboard can be used as few buttons in one, for me two works the best, or as fancy potentiometer.

20230224_200238.mp4

compresed.mp4