USB volume control

thingiverse

USB volume control for Windows https://www.instructables.com/Digispark-Volume-Control/ Code and wiring https://learn.adafruit.com/trinket-usb-volume-knob/code I used cheap MCU board Digispark Attiny85. Library "Trinket USB Keyboard" for Arduino IDE. Code is example named TrinketVolumeKnobPlus. I missed the MUTE indication in the original DIY project. The MCU board does not have a free digital pin for software LED switching. I solved it with a flip-flop switched by pressing a rotary encoder. If you need switch LED on start: Add this: pinMode(PIN_ENCODER_SWITCH, OUTPUT); // the switch is active-high, not active-low // since it shares the pin with Trinket's built-in LED // the LED acts as a pull-down resistor digitalWrite(PIN_ENCODER_SWITCH, HIGH); delay(200); pinMode(PIN_ENCODER_SWITCH, INPUT);