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

ZoomMuteButton.ino

/*
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 and add comments for my own understanding

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.
 * A momentary press on button 2 will toggle video on or off.
Unfortunately, exiting a meeting with only key presses is no longer possible in Zoom, so I have removed that feature.
*/

#include <DigiKeyboard.h> // Library for sending keystrokes as an HID device over USB
#include <OneButton.h>    // Library for button input functions
#include <FastLED.h>      // Library for controlling LEDs with high speed math

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

  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
  button2.attachClick(button2click); // Set up button 2 for Zoom video toggle function
  button1.setPressTicks(300); // 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();
  analogWrite(1, beatsin8(LedBreatheSpeed, LedMinBrightness)); // Make LED "breathe"
}

// 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 2 is pressed for more than 50ms and less than 300ms.
void button2click() {
  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_V, MOD_ALT_LEFT); // Toggle video 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); // Bring Zoom into foreground
  DigiKeyboard.delay(50); // Give Zoom a chance to get into the foreground
  DigiKeyboard.sendKeyPress(KEY_SPACE); // Press and hold the space key to trigger zoom to temporarily unmute
}

// 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
}

I'm trying to get the code to work on a Mac does anyone have example KeyStrokes?

Here is the logic for Mute on a Mac
DigiKeyboard.sendKeyStroke(KEY_A, MOD_GUI_LEFT | MOD_CMD_LEFT | MOD_SHIFT_LEFT); // Toggle mute on or off in Zoom

And here is the logic for ending a meeting

  DigiKeyboard.sendKeyStroke(0); // Clear any current key presses
  DigiKeyboard.delay(50);
  DigiKeyboard.sendKeyStroke(KEY_W, MOD_CMD_LEFT);
  DigiKeyboard.delay(500);
  DigiKeyboard.sendKeyStroke(KEY_ENTER);
  DigiKeyboard.delay(500);

I had to add "#define MOD_CMD_LEFT 0x00000008" for the comand key

And unlike on a PC, there doesn't appear to be a zooms shortcut to bring the window into focus

Here is a Mac Version if anyone is looking for it:
https://gist.github.com/kingfisher1234/caf351bed786f9050e1fa28c3352ded9

Thank you for sharing a great project.
I modified the source code to create a macro pad for Microsoft Teams.

• Physical mute button for Microsoft Teams using an ATTiny85/Digispark and the Micronucleus bootloader to allow programming with the Arduino IDE

The following is an article in Japanese.

• blog 渓鉄: Digisparkでマクロパッドを作った: オンライン会議向けのマイクミュートやカメラのON/OFF操作デバイス