PComp – Tilt Switch + LCD 4-Number Display.ino

int switchPin = 13;
int oldState = 0;
int count = 0;

// See the video here for pin reference:
// https://create.arduino.cc/projecthub/SAnwandter1/programming-4-digit-7-segment-led-display-2d33f8
// The video has pins A-G in 2-8 and D pins in 9-12. 
// I moved pins A-G to 6-12 and connected D pins to 2-5.
int pinA = 6;
int pinB = 7;
int pinC = 8;
int pinD = 9;
int pinE = 10;
int pinF = 11;
int pinG = 12;
int D1 = 2;
int D2 = 3;
int D3 = 4;
int D4 = 5;

void setup() {
  pinMode(pinA, OUTPUT);     
  pinMode(pinB, OUTPUT);     
  pinMode(pinC, OUTPUT);     
  pinMode(pinD, OUTPUT);     
  pinMode(pinE, OUTPUT);     
  pinMode(pinF, OUTPUT);     
  pinMode(pinG, OUTPUT);   
  pinMode(D1, OUTPUT);  
  pinMode(D2, OUTPUT);  
  pinMode(D3, OUTPUT);  
  pinMode(D4, OUTPUT);  
  pinMode(switchPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  int state = digitalRead(switchPin);
  if (state != oldState && state == 1) {
    count++;
  }
  oldState = state;

  displayNumber(count);
}

// Displays any 4-digit number on the LCD display.
void displayNumber(int number) {
  int n = number;
  int digitPosition = 3;
  while (n > 0) {
    int digit = n % 10;
    displayDigit(digit, digitPosition);
    digitPosition--;
    n /= 10;
    delay(5);
  }
}

// This method only supports 4-digit LCDs.
// pos is the position of the digit on the LCD.
// The leftmost is pos 0, and the rightmost is pos 3.
void displayDigit(int digit, int pos) {
  switch (pos) {
    case 0:
      digitalWrite(D1, LOW);
      digitalWrite(D2, HIGH);
      digitalWrite(D3, HIGH);
      digitalWrite(D4, HIGH);
      break;
    case 1:
      digitalWrite(D1, HIGH);
      digitalWrite(D2, LOW);
      digitalWrite(D3, HIGH);
      digitalWrite(D4, HIGH);
      break;
    case 2:
      digitalWrite(D1, HIGH);
      digitalWrite(D2, HIGH);
      digitalWrite(D3, LOW);
      digitalWrite(D4, HIGH);
      break;
    case 3:
      digitalWrite(D1, HIGH);
      digitalWrite(D2, HIGH);
      digitalWrite(D3, HIGH);
      digitalWrite(D4, LOW);
      break;
    default:
      digitalWrite(D1, HIGH);
      digitalWrite(D2, HIGH);
      digitalWrite(D3, HIGH);
      digitalWrite(D4, HIGH);
      break;
  }
  switch (digit) {
    case 0:
      digitalWrite(pinA, HIGH);
      digitalWrite(pinB, HIGH);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, HIGH);
      digitalWrite(pinE, HIGH);
      digitalWrite(pinF, HIGH);
      digitalWrite(pinG, LOW);
      break;
    case 1:
      digitalWrite(pinA, LOW);
      digitalWrite(pinB, HIGH);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, LOW);
      digitalWrite(pinE, LOW);
      digitalWrite(pinF, LOW);
      digitalWrite(pinG, LOW);
      break;
    case 2:
      digitalWrite(pinA, HIGH);
      digitalWrite(pinB, HIGH);
      digitalWrite(pinC, LOW);
      digitalWrite(pinD, HIGH);
      digitalWrite(pinE, HIGH);
      digitalWrite(pinF, LOW);
      digitalWrite(pinG, HIGH);
      break;
    case 3:
      digitalWrite(pinA, HIGH);
      digitalWrite(pinB, HIGH);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, HIGH);
      digitalWrite(pinE, LOW);
      digitalWrite(pinF, LOW);
      digitalWrite(pinG, HIGH);
      break;
    case 4:
      digitalWrite(pinA, LOW);
      digitalWrite(pinB, HIGH);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, LOW);
      digitalWrite(pinE, LOW);
      digitalWrite(pinF, HIGH);
      digitalWrite(pinG, HIGH);
      break;
    case 5:
      digitalWrite(pinA, HIGH);
      digitalWrite(pinB, LOW);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, HIGH);
      digitalWrite(pinE, LOW);
      digitalWrite(pinF, HIGH);
      digitalWrite(pinG, HIGH);
      break;
    case 6:
      digitalWrite(pinA, HIGH);
      digitalWrite(pinB, LOW);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, HIGH);
      digitalWrite(pinE, HIGH);
      digitalWrite(pinF, HIGH);
      digitalWrite(pinG, HIGH);
      break;
    case 7:
      digitalWrite(pinA, HIGH);
      digitalWrite(pinB, HIGH);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, LOW);
      digitalWrite(pinE, LOW);
      digitalWrite(pinF, HIGH);
      digitalWrite(pinG, LOW);
      break;
    case 8:
      digitalWrite(pinA, HIGH);
      digitalWrite(pinB, HIGH);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, HIGH);
      digitalWrite(pinE, HIGH);
      digitalWrite(pinF, HIGH);
      digitalWrite(pinG, HIGH);
      break;
    case 9:
      digitalWrite(pinA, HIGH);
      digitalWrite(pinB, HIGH);
      digitalWrite(pinC, HIGH);
      digitalWrite(pinD, HIGH);
      digitalWrite(pinE, LOW);
      digitalWrite(pinF, HIGH);
      digitalWrite(pinG, HIGH);
      break;
  }
}