Why is the screen flickering?

Question

Arduino

Hello. I am trying to display the temperature on the lcd 1602 i2c screen from the bme280 sensor, but when I try to do this, the screen starts to flicker. As soon as I remove the line of code with the output of the temperature, everything starts working fine.

here is the code

#include <iarduino_RTC.h>
iarduino_RTC time(RTC_DS1307);       
#include <Wire.h>                             
#include <LiquidCrystal_I2C.h>      
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme;
LiquidCrystal_I2C LCD(0x27,16,2); 

void setup() {
   delay(300);
   LCD.init();            
   LCD.backlight();  
   time.begin();
   time.settime(0, 30, 18, 12, 6, 20, 5); 
}

void loop() {
   if (millis() % 1000 == 0) {
      LCD.setCursor(0,0);
      LCD.print(bme.readTemperature());
      LCD.setCursor(4,1);
      LCD.print(time.gettime("H:i:s"));
      
      delay(1);
   }

Answer 1

bme.readTemperature() takes some time, long enough for the eye to notice the delay. Try to read the temperature into a variable, and then display it on the screen:

float temp = bme.readTemperature();
LCD.setCursor(0,0);
LCD.print(temp );
LCD.setCursor(4,1);
LCD.print(time.gettime("H:i:s"));

Answer 2

You have two devices on the I2C bus. What are their addresses? Most likely they are in conflict.
BME280 also seems to work via SPI. Try like this.