I think that we can use the type TSOP1838/AH1838/VS1838 infrared receiver module here. It’s noteworthy that the temperature sensor socket’s pin assignment is in the correct order for DS18B20 only.

I made this project because I wanted a way to automatically control the speed of a DC fan according to the temperature read by a LM35 sensor. I had a few problems with the PWM part mainly because the ...