// Distance Meter OLED Display
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define trigPin 9
#define echoPin 10
#define MEASURE_BUTTON 2
#define CLEAR_BUTTON 3
#define MY_BUTTON 8
#define OLED_RESET 4

bool isButtonPressed(int buttonPin);

bool circuitOn = false;
Adafruit_SSD1306 display(OLED_RESET);

float currentDistance = 0;
float previousDistance1 = 0;
float previousDistance2 = 0;

int buttonPressCount = 0;
unsigned long lastButtonPressTime = 0;
unsigned long debounceDelay = 50;

void calculateArea();
void calculateVolume();

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(MEASURE_BUTTON, INPUT_PULLUP);
  pinMode(CLEAR_BUTTON, INPUT_PULLUP);
  pinMode(MY_BUTTON, INPUT_PULLUP);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // initialize with the I2C addr 0x3C (128x64)
  display.clearDisplay();
}

bool isButtonPressed(int buttonPin) {
  return digitalRead(buttonPin) == LOW;
}



// Updated loop function
void loop() {
if (isButtonPressed(MEASURE_BUTTON) && !circuitOn) {
// Turn on the circuit
circuitOn = true;
 digitalWrite(trigPin, LOW);
 // Ensure trigPin is initially LOW to prevent accidental trigger
  delay(100); // Wait for stability
 if (circuitOn == true) {
float duration;
float distance_cm;
float distance_m;
digitalWrite(trigPin, LOW); // PULSE _|---|_
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);                                                        
delayMicroseconds(10);
digitalWrite(trigPin, LOW) ;                                                                                              
duration = pulseIn(echoPin, HIGH) ;                                                
distance_cm = (duration / 2) / 29.1;                                                                                                           
display.setCursor(25, 0); // oled display                                                                                                                
display.setTextSize(1);                                                                                                                      
display.setTextColor(WHITE);                                                                                                                          
display.println("Distance");                                                                                                                                 
if (distance_cm < 100) { 

       // Display distance on OLED
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0,0);
display.print(F("Distance: "));
display.print(distance_cm);
display.print(F(" Cm"));
display.display();
delay(500);                                                                                                                                                                                                                    

 }                                                                                                                                         
//display.setCursor(10, 20); // oled display                                                                                                                                               
//display.setTextSize(2);                                                                                                                                                          
//display.setTextColor(WHITE);                                                                                                                                                                 
//display.println(distance_cm);                                                                                                                                                                         
//display.setCursor(90, 20);                                                                                                                                                                              
//display.setTextSize(1);                                                                                                                                                                                          
//display.println("cm");                                                                                                                                                                          
// Display distance on OLED                                                                                                                                                                                                       
//display.display();                                                                                                                                                                                                                   
//delay(500);                                                                                                                                                                                                                    
else
{
 distance_m = distance_cm  / 100.0; // Convert to meters

     // Display distance on OLED
     display.clearDisplay();
     display.setTextSize(1);
       display.setTextColor(SSD1306_WHITE);
         display.setCursor(0,0);
           display.print(F("Distance: "));
             display.print(distance_m);
               display.print(F(" m"));
                 display.display();

                 }                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
circuitOn = false;                                                                                                                                                                                                                                                                                
display.clearDisplay();                                                                                                                                                                                                                                           
Serial.println(distance_cm);                                                                                                                                                                                                                                                  
Serial.println(distance_m);                                                                                                                                                                                                  
}
 }                                                                                                                                                                                                                                                                       
if (isButtonPressed(CLEAR_BUTTON)) {                                                                                                                                                                                                                                                                                                    
// Clear the displayed values on the screen                                                                                                                                                                                                                                                                                                     
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0,0);
display.print(F("Distance: "));
display.display();                                                                                                                                                                                                                                                                                                     
delay(500);                                                                                                                                                                                                                                                                                                                                                                       
}     










// Check button press count for area and volume calculation
     // unsigned long currentTime = millis();
      //if (currentTime - lastButtonPressTime > debounceDelay) {
        //if (isButtonPressed(MY_BUTTON)) {
          //buttonPressCount++;
          //if (buttonPressCount == 1) {
            //calculateArea();
          //} else if (buttonPressCount == 2) {
            //calculateVolume();
            //buttonPressCount = 0; // Reset count after volume calculation
          //}
          //lastButtonPressTime = currentTime;
        //}
      //}

      //circuitOn = false;
      //display.clearDisplay();
      //Serial.println(currentDistance);
    //}

        if (isButtonPressed(MY_BUTTON)) {
                                 

void calculateArea() {
  float area = currentDistance * previousDistance1;
  displayResult(F("Area: "), area, F(" sq units"));
}

void calculateVolume() {
  float volume = currentDistance * previousDistance1 * previousDistance2;
  displayResult(F("Volume: "), volume, F(" cubic units"));
}

void displayResult(const __FlashStringHelper *label, float value, const __FlashStringHelper *unit) {
  // Display results on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print(label);
  display.print(value);
  display.print(unit);
  display.display();

  // Update previous distances
  previousDistance2 = previousDistance1;
  previousDistance1 = currentDistance;

  delay(500); // Adjust delay as needed
}
}