bad-keyboard

Arduino keyboard thingy inspired by this Twitter thread. Requires HoodLoader2. Flash the 328 sketch to the ATmega328 and the 16u2 sketch to the ATmega16u2.

Hardware requirements

• Arduino with HoodLoader2
• rotary encoder
• 8x8 dotmatrix display
• 8 bit shift register
• pushbutton

Required libraries

• HID-Project
• RotaryEncoder

Circuit

• shift register pins:
  • data pin (SER) connected to Arduino pin 4
  • latch pin (SRCLK) connected to Arduino pin 5
  • clock pin (RCLK) connected to Arduino pin 6
  • output pins connected to dotmatrix column pins (lowest pin to leftmost column)
• rotary encoder pins connected to Arduino pin 2 and 3
• button connected between 5V and Arduino analog pin 5, connect 10K resistor between pin A5 and GND
• pins 7 through 12 and A0, A1 connected to dotmatrix row pins (pin 7 to highest row, pin A1 to lowest row)