#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
// Ultrasonic sensor pins
const int trigPin = 4;
const int echoPin = 13;
// Bin height (for calculating fill % if you want)
const float binHeight = 400.0; // cm
long duration;
float distance;
float fillLevel;
void setup() {
Serial.begin(9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
// Initialize OLED
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)){
Serial.println("OLED not found");
while(1);
}
display.clearDisplay();
display.display();
}
float getDistance() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH, 30000); // 30 ms timeout
float dist = duration * 0.0343 / 2;
return dist;
}
void loop() {
distance = getDistance();
// Optional: calculate fill level %
if(distance > 0 && distance <= binHeight){
fillLevel = ((binHeight - distance) / binHeight) * 100;
} else {
fillLevel = 0;
}
// Display on OLED
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println("SMART DUSTBIN");
display.setCursor(0, 20);
display.print("Space Left: ");
display.print(distance);
display.println(" cm");
display.setCursor(0, 35);
display.print("Fill: ");
display.print(fillLevel);
display.println("%");
// Show "READY" if distance <= 20 cm
display.setCursor(0, 50);
if(distance <= 20 && distance > 0){
display.println("FULL");
}
display.display();
delay(500);
}