The code starts by including the necessary libraries and defining the pin connections for the fan, heating element, buttons, and LCD display. It also initializes the target temperature variable.
In the setup() function, the LCD display is initialized and the I2C communication is started. The BME280 sensor's I2C address is set, and if the sensor fails to connect, an error message is printed.
The loop() function is where the main functionality of the code resides. It starts by displaying the current room temperature from the BME280 sensor on the LCD display. It then displays the target temperature on the second line of the display.
The target temperature can be adjusted using the blue and red buttons. If the blue button is pressed, the target temperature is decreased by 1 degree, and if the red button is pressed, the target temperature is increased by 1 degree. There is a delay after each button press for debounce.
After adjusting the target temperature, the code compares the target temperature with the current room temperature. If the target temperature is higher, it turns on the heating element and turns off the fan. If the target temperature is lower or equal, it turns off the heating element and turns on the fan.
There is a delay of 1 second before the loop repeats.