A basic Arduino example of providing a digital reading of a potentiometer via a 7-segment display

7-segment-display.ino

// Potentiometer
int potPin = A0;

// 7-Segment Display
const int sA = 1;
const int sB = 7;
const int sC = 5;
const int sD = 4;
const int sE = 3;
const int sF = 2;
const int sG = 6;

const int allSegments[] = {sA, sB, sC, sD, sE, sF, sG};

const int digitPatterns[10][7] = {
  // sA,   sB,   sC,   sD,   sE,   sF,   sG
  {HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, LOW},  // 0
  {LOW,  HIGH, HIGH, LOW,  LOW,  LOW,  LOW},  // 1
  {HIGH, HIGH, LOW,  HIGH, HIGH, LOW,  HIGH}, // 2
  {HIGH, HIGH, HIGH, HIGH, LOW,  LOW,  HIGH}, // 3
  {LOW,  HIGH, HIGH, LOW,  LOW,  HIGH, HIGH}, // 4
  {HIGH, LOW,  HIGH, HIGH, LOW,  HIGH, HIGH}, // 5
  {HIGH, LOW,  HIGH, HIGH, HIGH, HIGH, HIGH}, // 6
  {HIGH, HIGH, HIGH, LOW,  LOW,  LOW,  LOW},  // 7
  {HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, HIGH}, // 8
  {HIGH, HIGH, HIGH, HIGH, LOW,  HIGH, HIGH}  // 9
};

void showDigit(int digit) {
  for (int s = 0; s < 7; s++) {
    digitalWrite(allSegments[s], digitPatterns[digit][s]);
  }
}

void setup() {
  for (int i = 0; i < 7; i++) {
    pinMode(allSegments[i], OUTPUT);
  }
}

void loop() {
  int potVal = analogRead(potPin);
  int potDigit = map(potVal, 0, 1023, 0, 9);
  showDigit(potDigit);
}