#include <LiquidCrystal.h>
// Define pins for ultrasonic sensor
const int trigPin = 34;
const int echoPin = 35;
// Define pins for LCD
const int rs = 32, en = 32, d4 = 0, d5 = 1, d6 = 2, d7 = 3;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup() {
// Initialize LCD
lcd.begin(20, 4);
// Initialize serial communication
Serial.begin(9600);
// Set ultrasonic sensor pins
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop() {
// Send ultrasonic pulse
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Read time taken for the pulse to return
long duration = pulseIn(echoPin, HIGH);
// Convert time to distance (in cm)
float distance = duration * 0.034 / 2;
// Print distance to serial monitor
Serial.print("Distance: ");
Serial.print(distance);
Serial.println(" cm");
// Display distance on LCD
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Distance: ");
lcd.print(distance);
lcd.print(" cm");
delay(1000);
}