Nextion - Arduino Nano Thermostat

Projects Programming
1

Hi Guys,

I'm a beginner to coding. Internet and Google only took me so far.....
I'm trying to build A nextion-arduino nano thermostat.

It took me ages to find the right libraries and code to make the nano and nextion communicate.

I managed to create the code, the DHT11 is reading the temp and displays it over the Nextion.
I managed to make the setting buttons temperature up and down working( on the Nextion touch screen) . However after im putting the IF statements ( if temp is higher than set temp then is HOT) the buttons are not working anymore and the thermostat is not working.

Can anyone give me a suggestion before I suffer a mental breakdown :).

Thanks guys.

nextion_thermostat.ino (9.66 KB)

2

this line

  if(temperature1 = countertemp)

does an asignment. If you want to compare values, use '=='

3

HI, I noticed that and made the correction. Still is the same outcome for some reason.

Thanks mate.

4

You are not using digitalWrite() correctly either:

digitalWrite(OUTPUT, 4);

The correct syntax is digitalWrite( pinNumber, state );
so you code should be

digitalWrite(4, HIGH); // or LOW

I would also recommend defining pins 2 to 5 rather than using the numbers. Give them meaningful names. (I'm not sure what that would be. maybe they have LEDs tied to them?)

const int coldPin = 2;
const int hotPin = 3;
const int dryPin = 4;
const int moistPin = 5;

and then use those names throughout your code rather than hardcoded numbers

5

Thanks,

I'll make the suggested settings. Basically when it will be cold, the pin is going to be connected to a relay to turn the heating on. Or if hot, to turn the vent on.

6

Basically when it will be cold, the pin is going to be connected to a relay to turn the heating on. Or if hot, to turn the vent on.

I'd need to see a schematic. Turning the relay on to turn a heater on makes sense. Turning the relay off, to turn a vent on, does not. First, you will have either the heater or the vent on all the time, since a relay is not a tri-state device. Second, a vent is not usually a powered device. It is open or closed, not on or off.