Build Instructions

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• 1

  PCB ASSEMBLY

  • We start the PCB assembly process by connecting the two CON20 female header pins on PICO's Footprint from the bottom side of the board.
  • Turning the board over, we use a soldering iron to solder the connector pads from the top side.
  • Next, from the top side of the PCB, we place the SSD1306 OLED, followed by the three mechanical switches.
  • We solder the switch and OLED pins from the bottom of the PCB.
  • Finally, we install the PICO over the CON20 Header pin connectors.

  The PCB assembly has been completed.

• 2

  FINAL ASSEMBLY

  After completing the PCB assembly, we begin the final assembly process, which begins with placing the Circuit over the 3D printed frame and then securing both of them with two M2 screws each.

  We added keycaps over the mechanical switches as a finishing touch, which completed the assembly process.

• 3

  CODE

  This was the code we used in this project and it's a simple one.

  #include <Wire.h>
  #include <Adafruit_GFX.h>
  #include <Adafruit_SSD1306.h>
  #include <Keyboard.h>
  // Pin Definitions
  #define BUTTON_COPY 0
  #define BUTTON_PASTE 1
  #define BUTTON_DELETE 2
  // OLED Display Config
  #define SCREEN_WIDTH 128
  #define SCREEN_HEIGHT 64
  Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
  // State Tracking
  unsigned long lastActionTime = 0;
  bool showingCommand = false;
  void setup() {
  pinMode(BUTTON_COPY, INPUT_PULLUP);
  pinMode(BUTTON_PASTE, INPUT_PULLUP);
  pinMode(BUTTON_DELETE, INPUT_PULLUP);
  Wire.begin();
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.display();
  Keyboard.begin();
  showIdle(); // Display "MACROPAD" at startup
  }
  void loop() {
  if (digitalRead(BUTTON_COPY) == LOW) {
  showCommand("Copy");
  Keyboard.press(KEY_LEFT_CTRL);
  Keyboard.press('c');
  delay(100);
  Keyboard.releaseAll();
  lastActionTime = millis();
  showingCommand = true;
  }
  else if (digitalRead(BUTTON_PASTE) == LOW) {
  showCommand("Paste");
  Keyboard.press(KEY_LEFT_CTRL);
  Keyboard.press('v');
  delay(100);
  Keyboard.releaseAll();
  lastActionTime = millis();
  showingCommand = true;
  }
  else if (digitalRead(BUTTON_DELETE) == LOW) {
  showCommand("Delete");
  Keyboard.press(KEY_DELETE);
  delay(100);
  Keyboard.releaseAll();
  lastActionTime = millis();
  showingCommand = true;
  }
  // Check if 5 seconds have passed since last action
  if (showingCommand && millis() - lastActionTime > 5000) {
  showIdle();
  showingCommand = false;
  }
  delay(100); // Loop throttle + debounce
  }
  void showCommand(String command) {
  display.clearDisplay();
  display.setTextSize(2);
  int16_t x = (SCREEN_WIDTH - command.length() * 12) / 2;
  display.setCursor(max(0, x), 20);
  display.println(command);
  display.display();
  }
  void showIdle() {
  display.clearDisplay();
  display.setTextSize(2);
  display.setCursor(20, 20);
  display.println("MACROPAD");
  display.display();
  }

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