HELP plz: BME280 only display 0.00 on LCD

Other Hardware Sensors
1

Well folks, its been a while!

Didnt play with arduino for a while and then i got that idea that I could make a dry cabinet for my photography gear instead of buying one.

Plan was kinda simple in my mind: I bought a dead Wine Cooler with 2 different compartment and removed the cooling system from it.

Then I modified the fan system and added peltier cooling unit to act as dehumidifier. So far that part of the project is working well.

I plan to use 1 arduino to read 2 BME280 (One in each compartment) and to display reading on 2 LCD 20x4. The arduino will also be controlling a relay shield to turn on and off the peltier unit as required.

SOOOOOOOOO

here is the problem: Only get 0.00 as reading on my LCD.

Ive run a scanner to get the I2C adress of both item 0x77 for the BME280 and 0x26 the LCD.

here is the code:

//#include <SPI.h>
#include <Wire.h>
#include <cactus_io_BME280_I2C.h>
#include <LiquidCrystal_I2C.h>

// Create two BME280 instances
BME280_I2C bmeL(0x77); // I2C using address 0x77
//BME280_I2C bmeR(0x76); // I2C using address 0x76

// Create two 1602 lCD instances
LiquidCrystal_I2C lcdL(0x26,20,4);  // set the LCD1 (Right) address to 0x26 
//LiquidCrystal_I2C lcdR(0x27,20,4);  // set the LCD2 (Left) address to 0x27

void setup() {

//initialise LCDs
  lcdL.init();
  //lcdR.init(); 
  lcdL.backlight();
  //lcdR.backlight();  

  
}

void loop() {

//Serial.print("BME 1\t");
bmeL.readSensor();
//lcdL.print(bmeL.getPressure_MB()); lcdL.print(" mb\t"); // Pressure in millibars
//Serial.print(bme1.getHumidity()); Serial.print(" %\t\t");
//Serial.print(bme1.getTemperature_C()); Serial.print(" *C\t");

delay(1000);

  lcdL.setCursor(0,0);
  lcdL.print("Humidity: ");
  lcdL.print(bmeL.getHumidity());
  lcdL.print("%");

  lcdL.setCursor(0,1);
  lcdL.print("Temperature: ");
  lcdL.print(bmeL.getTemperature_C());
  lcdL.print((char)223);
  lcdL.print("C");

  /*lcdL.setCursor(0,2);
  lcdL.print("pressure: ");
  lcdL.print(bmeL.getPressure_MB());
  lcdL.print("Mb");*/


  


// Add a 1 second delay.
delay(1000); // just here to slow down the output.

}

please do not mind all the //commented line. Im not a professional coder, so i used code from exemple that work on serial monitor then play with them to get it work the way i need...

So Im asking your help to figure it out :slight_smile: and if possible using plain language so I can understand haha

thanks

KArl

2

Start with just displaying on Serial Monitor.

Next add the code for the LCD.

One step at at time especially if you are new to this.

3

MY BME280 work on 0x76, so are you sure 0x77 is correct? Your code does not test for errors if it's not.

4

At first I worked it on the serial monitor. it worked well there.
then I just took the code and converted it to be use on LCD.

The adress returned by the scanner said 0x77

Ill go thy 0x76 just out of curiosity

5

well.... i sort it out...

i forgot this:

if (!bmeL.begin())
{
   lcdL.println("check wiring!");
   while (1);
 }

now it work.