#include uint8_t buf[8] = {0}; // Keyboard Report Buffer: 8 bytes #define PIN_W A0 #define PIN_A A1 // Button to press Enter #define PIN_S A2 // Button to type "music" #define PIN_D A3 // Command + Space #define PIN_VOL_UP A4 // Button to increase volume #define PIN_VOL_DOWN 2 // Button to decrease volume bool currState_W = HIGH; bool currState_A = HIGH; bool currState_S = HIGH; bool currState_D = HIGH; bool currState_VOL_UP = HIGH; bool currState_VOL_DOWN = HIGH; bool prevState_W = HIGH; bool prevState_A = HIGH; bool prevState_S = HIGH; bool prevState_D = HIGH; bool prevState_VOL_UP = HIGH; bool prevState_VOL_DOWN = HIGH; unsigned long prevTime_W = 0; unsigned long prevTime_A = 0; unsigned long prevTime_S = 0; unsigned long prevTime_D = 0; unsigned long prevTime_VOL_UP = 0; unsigned long prevTime_VOL_DOWN = 0; unsigned long waitTime_W = 50; unsigned long waitTime_A = 50; unsigned long waitTime_S = 50; unsigned long waitTime_D = 50; unsigned long waitTime_VOL_UP = 50; unsigned long waitTime_VOL_DOWN = 50; void setup() { Serial.begin(9600); pinMode(PIN_W, INPUT_PULLUP); pinMode(PIN_A, INPUT_PULLUP); // Enter key pinMode(PIN_S, INPUT_PULLUP); // Type "music" pinMode(PIN_D, INPUT_PULLUP); // Command + Space pinMode(PIN_VOL_UP, INPUT_PULLUP); // Volume up pinMode(PIN_VOL_DOWN, INPUT_PULLUP); // Volume down delay(200); } void loop() { checkButton(); } void checkButton() { bool currRead_W = digitalRead(PIN_W); bool currRead_A = digitalRead(PIN_A); bool currRead_S = digitalRead(PIN_S); bool currRead_D = digitalRead(PIN_D); bool currRead_VOL_UP = digitalRead(PIN_VOL_UP); bool currRead_VOL_DOWN = digitalRead(PIN_VOL_DOWN); if (currRead_W != prevState_W) { prevTime_W = millis(); } if (currRead_A != prevState_A) { prevTime_A = millis(); } if (currRead_S != prevState_S) { prevTime_S = millis(); } if (currRead_D != prevState_D) { prevTime_D = millis(); } if (currRead_VOL_UP != prevState_VOL_UP) { prevTime_VOL_UP = millis(); } if (currRead_VOL_DOWN != prevState_VOL_DOWN) { prevTime_VOL_DOWN = millis(); } if ((millis() - prevTime_W) > waitTime_W) { if (currRead_W != currState_W) { currState_W = currRead_W; if (currState_W == LOW) { buf[0] = 0x01; // HID: Left Control key buf[2] = 0x50; // HID: Left Arrow key Serial.write(buf, 8); // Send keypress } else { releaseKey(); // Function to release all keys } } } if ((millis() - prevTime_A) > waitTime_A) { if (currRead_A != currState_A) { currState_A = currRead_A; if (currState_A == LOW) { buf[2] = 0x2C; // HID: Space key Serial.write(buf, 8); // Send Enter keypress } else { releaseKey(); } } } if ((millis() - prevTime_S) > waitTime_S) { if (currRead_S != currState_S) { currState_S = currRead_S; if (currState_S == LOW) { buf[0] = 0x01; // HID: Left Control key buf[2] = 0x4F; // HID: Right Arrow key Serial.write(buf, 8); // Send keypress } else { releaseKey(); // Function to release all keys } } } if ((millis() - prevTime_D) > waitTime_D) { if (currRead_D != currState_D) { currState_D = currRead_D; if (currState_D == LOW) { // Start Command + Space sequence buf[0] = 0x08; // Command key modifier buf[2] = 0x2C; // Spacebar HID code Serial.write(buf, 8); // Send Command + Spacebar releaseKey(); // Release both keys delay(1000); // Wait 1 second // Type "terminal" typePhrase("terminal"); delay(500); // Wait 0.5 seconds // Press Enter buf[2] = 0x28; // Enter key HID code Serial.write(buf, 8); releaseKey(); // Release Enter delay(1000); // Wait 1 second // Type "cd downloads" typePhrase("cd"); delay(100); buf[2] = 0x2C; // Spacebar HID code Serial.write(buf, 8); // Send Space releaseKey(); // Release Space delay(100); typePhrase("downloads"); delay(100); buf[2] = 0x28; // Enter key HID code Serial.write(buf, 8); // Send Enter releaseKey(); // Release Enter delay(200); // Small delay between commands // Type "python3 music3.py" typePhrase("python"); // Type "3" buf[2] = 0x20; // 3 HID code Serial.write(buf, 8); // Send 3 releaseKey(); // Release 3 delay(100); // Press Space buf[2] = 0x2C; // Spacebar HID code Serial.write(buf, 8); // Send Space releaseKey(); // Release Space delay(100); // Type "music" typePhrase("music"); // Type "." buf[2] = 0x37; // . HID code Serial.write(buf, 8); // Send period releaseKey(); // Release period // Type "py" typePhrase("py"); delay(100); // Press Enter buf[2] = 0x28; // Enter key HID code Serial.write(buf, 8); // Send Enter releaseKey(); // Release Enter } else { releaseKey(); // Release all keys } } } if ((millis() - prevTime_VOL_UP) > waitTime_VOL_UP) { if (currRead_VOL_UP != currState_VOL_UP) { currState_VOL_UP = currRead_VOL_UP; if (currState_VOL_UP == LOW) { // Send Volume Up keypress buf[0] = 0x00; // No modifier buf[2] = 0x80; // HID code for Volume Up Serial.write(buf, 8); // Send Volume Up keypress releaseKey(); // Release Volume Up key } } } if ((millis() - prevTime_VOL_DOWN) > waitTime_VOL_DOWN) { if (currRead_VOL_DOWN != currState_VOL_DOWN) { currState_VOL_DOWN = currRead_VOL_DOWN; if (currState_VOL_DOWN == LOW) { // Send Volume Down keypress buf[0] = 0x00; // No modifier buf[2] = 0x81; // HID code for Volume Down Serial.write(buf, 8); // Send Volume Down keypress releaseKey(); // Release Volume Down key } } } prevState_W = currRead_W; prevState_A = currRead_A; prevState_S = currRead_S; prevState_D = currRead_D; prevState_VOL_UP = currRead_VOL_UP; prevState_VOL_DOWN = currRead_VOL_DOWN; } void typePhrase(const char* phrase) { while (*phrase) { buf[2] = charToHID(*phrase); // Convert each character to HID code Serial.write(buf, 8); // Send each keypress releaseKey(); // Release each key delay(100); // Small delay between each key phrase++; } } uint8_t charToHID(char c) { if (c >= 'a' && c <= 'z') { return (c - 'a' + 4); // HID codes for lowercase letters start from 4 } return 0; // Default return 0 if character not mapped } void releaseKey() { buf[0] = 0; buf[2] = 0; Serial.write(buf, 8); // Release key }