// ===================================================
// 7-Segment Servo Display (1 Servo per Segment)
// ESP32 + Wokwi
// ===================================================

#include <ESP32Servo.h>

// -------- Servo Pins (ESP32 GPIOs) --------
#define SERVO_A 16
#define SERVO_B 4
#define SERVO_C 2
#define SERVO_D 15
#define SERVO_E 19
#define SERVO_F 18
#define SERVO_G 5

// -------- Servo Angles --------
const int SEG_OFF = 0;    // segment OFF position
const int SEG_ON  = 90;   // segment ON position

// -------- Servo Objects --------
Servo segA;
Servo segB;
Servo segC;
Servo segD;
Servo segE;
Servo segF;
Servo segG;

// -------- 7-Segment Digit Table --------
// Order: A B C D E F G
const bool DIGIT_SEGMENTS[10][7] = {
  {1,1,1,1,1,1,0}, // 0
  {0,1,1,0,0,0,0}, // 1
  {1,1,0,1,1,0,1}, // 2
  {1,1,1,1,0,0,1}, // 3
  {0,1,1,0,0,1,1}, // 4
  {1,0,1,1,0,1,1}, // 5
  {1,0,1,1,1,1,1}, // 6
  {1,1,1,0,0,0,0}, // 7
  {1,1,1,1,1,1,1}, // 8
  {1,1,1,1,0,1,1}  // 9
};

// -------- Helper Function --------
void setSegment(Servo &servo, bool on) {
  servo.write(on ? SEG_ON : SEG_OFF);
}

// -------- Display Digit --------
void showDigit(int digit) {
  if (digit < 0 || digit > 9) return;

  setSegment(segA, DIGIT_SEGMENTS[digit][0]);
  setSegment(segB, DIGIT_SEGMENTS[digit][1]);
  setSegment(segC, DIGIT_SEGMENTS[digit][2]);
  setSegment(segD, DIGIT_SEGMENTS[digit][3]);
  setSegment(segE, DIGIT_SEGMENTS[digit][4]);
  setSegment(segF, DIGIT_SEGMENTS[digit][5]);
  setSegment(segG, DIGIT_SEGMENTS[digit][6]);
}

// -------- Setup --------
void setup() {
  Serial.begin(115200);
  Serial.println("7-Segment Servo Display Ready");
  Serial.println("Send digits 0–9 via Serial Monitor");

  segA.attach(SERVO_A);
  segB.attach(SERVO_B);
  segC.attach(SERVO_C);
  segD.attach(SERVO_D);
  segE.attach(SERVO_E);
  segF.attach(SERVO_F);
  segG.attach(SERVO_G);

  showDigit(0); // default display
}

// -------- Loop --------
void loop() {
  if (Serial.available()) {
    char ch = Serial.read();
    if (ch >= '0' && ch <= '9') {
      showDigit(ch - '0');
    }
  }
}