Multiple I2C sensors and libraries using Arduino(s) on a Water Tank ( Wireless )

Projects Programming
17

Juraj:
it looks good.

I use

    byte hi = x.read();

byte lo = x.read();
int res = hi * 256 + lo;




but shift operator is faster

Thank you. I got it to work finally!

At first, it didn't work. But, I did run I2C search sketch to make sure ( this problem happened before and took me months to figure it out )
I found the address is 56 Decimal.. I don't know why the address has changes. Edited the code and worked.
Also, implemented your suggestion.

I have problem with LCD screen.

3654×1625 389 KB

and code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

//LCD
#define BACKLIGHT_PIN 3
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

void setup() {
  
  Serial.begin(9600);
  lcd.begin(20,4);
  Wire.begin();
  Wire.setClock(400000L);
}

int Range=0;
int Percentage;
void loop() {
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
 // Step1: instruct sensor to read
  Wire.beginTransmission(56);
  Wire.write(byte(0x00));      // sets register pointer to the command register (0x00)
  Wire.write(byte(0x51));      //81 decimal

  Wire.endTransmission();      // stop transmitting

  // step2: for reading to happen 
 
  delay(250); 

 // step 3: instruct sensor to return a particular echo reading
  Wire.beginTransmission(56); // transmit to device #112
  Wire.write(byte(0x02));      // sets register pointer to echo #1 register (0x02)
  Wire.endTransmission();      // stop transmitting
 

// step 4: request reading from sensor
  Wire.requestFrom(56,2);    

  
// step 5: receive reading from sensor
  if (2 <= Wire.available()) { // if two bytes were received
    byte hi = Wire.read();
    byte lo = Wire.read();
    int Range = hi * 256 + lo;

    Range = constrain(Range, 25, 150);
    Percentage = map(Range, 150, 25, 0, 100);

  Serial.print("Range= ");Serial.println(Range);   // print the reading
  Serial.print("% ");Serial.println(Percentage);

  lcd.setCursor(0, 0); // top left
  lcd.print("Range= "); lcd.println(Range);
  lcd.setCursor(0, 1); // bottom left
  lcd.println("Water level"); 
  lcd.setCursor(15, 1); // bottom right
  lcd.print("% "); lcd.println(Percentage);
  }

  
  delay(300);              
}

And thank you and PaulS