From Blind to Eagle-Eyed: Supercharge Your Project with a Single GP2Y

				
					#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

#define SENSOR_PIN A0
#define VREF 5.0
#define ADC_MAX 1023

void setup() {
  Serial.begin(9600);
  
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    while(1);
  }
  
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(20, 20);
  display.println("Distance Sensor");
  display.setCursor(30, 40);
  display.println("Starting...");
  display.display();
  delay(1000);
}

float getDistance() {
  int sum = 0;
  for(int i = 0; i < 10; i++) {
    sum += analogRead(SENSOR_PIN);
    delay(2);
  }
  
  float voltage = (sum / 10.0) * (VREF / ADC_MAX);
  float distance = (5.0 - voltage) * 3.0 + 1.0;
  
  if(distance < 1.0) distance = 1.0;
  if(distance > 15.0) distance = 15.0;
  
  return distance;
}

void showDisplay(float dist, float volt, int adc) {
  display.clearDisplay();
  
  // Title
  display.setCursor(0, 0);
  display.println("Distance Sensor");
  display.drawFastHLine(0, 10, 128, WHITE);
  
  // Distance
  display.setTextSize(3);
  display.setCursor(10, 15);
  display.print(dist, 1);
  display.setTextSize(2);
  display.print(" cm");
  
  // Info
  display.setTextSize(1);
  display.setCursor(0, 45);
  display.print("Volt: ");
  display.print(volt, 2);
  display.print("V");
  
  display.setCursor(0, 55);
  display.print("ADC: ");
  display.print(adc);
  display.print(" 1-15cm");
  
  // Progress bar
  int bar = map(constrain(dist, 1, 15), 1, 15, 20, 120);
  display.fillRect(20, 35, bar, 6, WHITE);
  
  display.display();
}

void loop() {
  int adcValue = analogRead(SENSOR_PIN);
  float voltage = adcValue * (VREF / ADC_MAX);
  float distance = getDistance();
  
  Serial.print("ADC:");
  Serial.print(adcValue);
  Serial.print(" Volt:");
  Serial.print(voltage, 2);
  Serial.print("V Dist:");
  Serial.print(distance, 1);
  Serial.println("cm");
  
  showDisplay(distance, voltage, adcValue);
  delay(300);
}