Build Instructions

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• 1

  PCB Assembly Process

  • Using a solder paste dispenser needle, we begin the PCB assembly process by putting solder paste on each component pad.
  • Next, we pick and place the SMD Switch in its location using an ESD Tweezer.
  • Subsequently, we remove the board and set it on our Reflow Hotplate, which raises the PCB's temperature from below to the point at which the solder paste melts and the SMD components are all connected to their pads.
  • We attached the pads of the two CON7 Female Header Pin connectors that we inserted from the back side of the PCB to the location of the XIAO Microcontroller.
  • We soldered the OLED into place after adding it from the top side.

  Board assembly is now complete.

• 2

  Layer Assembly process

  • Connecting the 9mm PCB standoffs to the top layer of the board via its four mounting holes is how we begin the layer assembly procedure.
  • Next, we placed XIAO in its proper spot on the bottom side of the Mid Board.
  • The top layer board was flipped, and the two 3D printed switches were inserted into their designated slots. Next, the mid layer was positioned from the bottom of the top layer, and the top and mid layer boards were joined together using four 12mm PCB standoffs.
  • Finally, we position the bottom layer PCB on the standoffs connecting it to the mid layer and fasten it in place with four M3 bolts.

  Assembly is now completed.

• 3

  Main Code

  Here's the code we used in this project and its a simple one.

  #include <Wire.h>
  #include <Adafruit_GFX.h>
  #include <Adafruit_SSD1306.h>
  #include <Keyboard.h>
  #define SCREEN_WIDTH 128
  #define SCREEN_HEIGHT 32
  #define OLED_RESET    -1
  Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
  const int buttonCopyPin = 1; // Pin for the copy button
  const int buttonPastePin = 0; // Pin for the paste button
  void setup() {
  // Initialize the OLED display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
  Serial.println(F("SSD1306 allocation failed"));
  for(;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();
  // Initialize the buttons
  pinMode(buttonCopyPin, INPUT_PULLUP);
  pinMode(buttonPastePin, INPUT_PULLUP);
  // Initialize the Keyboard library
  Keyboard.begin();
  }
  void loop() {
  if (digitalRead(buttonCopyPin) == LOW) {
  display.clearDisplay();
  display.setTextSize(3);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(20, 5);
  display.print("Copy");
  display.display();
  Keyboard.press(KEY_LEFT_CTRL);
  Keyboard.press('c');
  delay(100);
  Keyboard.releaseAll();
  delay(500); // Debounce delay
  }
  if (digitalRead(buttonPastePin) == LOW) {
  display.clearDisplay();
  display.setTextSize(3);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(20, 5);
  display.print("Paste");
  display.display();
  Keyboard.press(KEY_LEFT_CTRL);
  Keyboard.press('v');
  delay(100);
  Keyboard.releaseAll();
  delay(500); // Debounce delay
  }
  }

  This sketch uses the Adafruit_SSD1306 library to control a small OLED screen and the Keyboard library to send keyboard inputs. Here, this macropad sends copy (Ctrl + C) and paste (Ctrl + V) commands when the respective buttons are pressed. The OLED display is used to show "Copy" or "Paste" for visual feedback whenever the respective button is pressed.

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