Physical mute button for Zoom using an ATTiny85/Digispark and the Micronucleus bootloader to allow programming with the Arduino IDE - PC Version

gistfile1.txt

/*
Thanks to Elliotmade for the inspiration on this project
https://elliotmade.com/2020/04/23/physical-mute-button-for-zoom-meetings/
Refactored by HaxNobody to extend functionalty:
https://gist.github.com/HaxNobody/7bde369d7a41348b8b91c1a4f358ea4a#file-zoommutebutton-ino
This program will send USB HID keyboard presses to bring the Zoom window into
the foreground and activate microphone and video functions.
 * A momentary press on button 1 will toggle mute on or off.
 * Press and hold button 1 to activate PTT (Push-to-Talk) functionality.
 * Press and hold button 1 to close zoom
*/

#include <DigiKeyboard.h> // Library for sending keystrokes as an HID device over USB
#include <OneButton.h>    // Library for button input functions

#define LedBreatheSpeed 12 // Speed of LED breathing animation in BPM
#define LedMinBrightness 5 // Minimum brightness value

#define MOD_CMD_LEFT 0x00000008
#define MOD_LEFTSHIFT 0xe1

  OneButton button1(
    0,          // Pin Number
    true,       // Input is active LOW
    true        // Enable internal pull-up resistor
  );
  OneButton button2(
    2,          // Pin Number
    true,       // Input is active LOW
    true        // Enable internal pull-up resistor
  );

void setup() {
  button1.attachClick(button1click); // Set up button 1 for Zoom mute toggle function
  button1.attachLongPressStart(button1longPressStart); // Set up button 1 for Zoom temporary unmute function
  button1.attachLongPressStop(button1longPressStop); // Set up button 1 for Zoom temporary unmute release function
  button1.setPressTicks(1000); // Reduce long-press delay for button 1 to make temporary unmute more responsive

  DigiKeyboard.delay(50); // Delay before entering loop
  pinMode(1, OUTPUT); // Initialize LED pin
}

void loop() {
  DigiKeyboard.update(); // Maintain USB communication
  button1.tick(); // Check status of buttons in a continuous loop
  button2.tick();
}

// This function will be called when button 1 is pressed for more than 50ms and less than 300ms.
void button1click() {
  DigiKeyboard.sendKeyStroke(0); // Clear any current key presses
  DigiKeyboard.sendKeyStroke(0, MOD_SHIFT_LEFT | MOD_CONTROL_LEFT | MOD_ALT_LEFT); // Bring Zoom into foreground
  DigiKeyboard.delay(50); // Give Zoom a chance to get into the foreground
  DigiKeyboard.sendKeyStroke(KEY_A, MOD_ALT_LEFT); // Toggle mute on or off in Zoom
}



// This function will be called when button 1 is pressed and held down for more than 300ms.
void button1longPressStart() {
  DigiKeyboard.sendKeyStroke(0); // Clear any current key presses
  DigiKeyboard.sendKeyStroke(0, MOD_SHIFT_LEFT | MOD_CONTROL_LEFT | MOD_ALT_LEFT);
  DigiKeyboard.delay(50);
  DigiKeyboard.sendKeyStroke(KEY_Q, MOD_ALT_LEFT);
  DigiKeyboard.delay(50);
  DigiKeyboard.sendKeyStroke(KEY_ENTER);
}

// This function will be called when button 1 is released after being held down.
void button1longPressStop() {
  DigiKeyboard.delay(300); // Delay to prevent cutting off the speaker's last word
  DigiKeyboard.sendKeyPress(0); // Release space key to re-mute Zoom after temporary unmute
}