LCD display goes crazy after large numbers are recieved by the HC-SR04 sensor

Using Arduino Displays
1

It displays the large number, but then just goes crazy and displays random characters. Here is my code below:

#include <LiquidCrystal.h>

// Define LCD pin connections
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// Define ultrasonic sensor pins
const int trigPin = 6;
const int echoPin = 10;
const int contrastPin = 9;
void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);
  pinMode(contrastPin, OUTPUT);
  analogWrite(contrastPin, 100);
  // Set up the LCD's number of columns and rows:
  lcd.begin(16, 2);

  // Set up ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // Measure distance using ultrasonic sensor
  long duration, distance_cm;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance_cm = duration * 0.034 / 2;  // Convert to centimeters

  // Print distance to Serial monitor for debugging
  Serial.print("Distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  // Display distance on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distance:");
  lcd.setCursor(0, 1);
  lcd.print(distance_cm);
  lcd.print(" cm");

  // Wait before taking next measurement
  delay(600);
}

Please help. I have increased the delay to no avail.

2

how large?

show picture

your sketch work fine

зображення
зображення1920×944 99.8 KB

3

Maybe set a timeout on the pulseIn

4

700 and above

brokenarduino
brokenarduino1200×800 234 KB

5

What will that do?

6

The timeout sets how long in microseconds pulseIn will wait for a pulse. Default is 1 second. If it doesn't get a pulse in that time, it returns 0.
How big a number do you expect it to return?
Set the timeout for that value.
Does that make sense?

7

Are you sure all the wiring to the LCD is good? No unsoldered or loose connections?

8

Yes. I am using a breadboard and connecting. I do not have a I2C adapter or a potentiometer, is that the problem?

9

No
The fact that it goes crazy with large numbers may just be an odd coincidence.

The HC-SR04 can't read 700cm distance, 400cm at most, so there must be something else going on when you try to read over 400cm.
What kind of target are you using when measuring distance?
Are you moving the Arduino, LCD and sensor?

10

I fixed the problem by installing an IC2 module.