communication between two JSN - SR04T

Other Hardware Sensors
23

Oh sorry i had fail i my copy/paste. I copied the correcd code below

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define trigPin 4
#define echoPin 10

// nastavení adresy I2C (0x27 v mém případě),
// a dále počtu znaků a řádků LCD, zde 20x4
LiquidCrystal_I2C lcd(0x3F, 16, 2);

void setup() {
  Serial.begin (9600);
  
  Serial.println("Init lcd");
  lcd.begin();
  lcd.backlight(); // zapne podsvětlení
  lcd.print("test");
  delay(10);
  lcd.clear();
  
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  int duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  Serial.print("Duration:");
  Serial.print(duration);
  Serial.println();
  distance = (duration/2) / 29.1;
  lcd.clear();
  if (distance >= 800 || distance <= 0){
    lcd.print("Out of range");
  }
  else {
    lcd.print(distance);
    lcd.print(" cm");
  }
  delay(500);
}

Its without NewPing library but it's works fine

1372×818 232 KB

And yes i tested it in air on my table.