I'm building a temp sensor and thermostat for 4 reptile cages It's pretty simple
I'll connect 4 lm35 temp sensors (0-100ºc) to the analog pins, each monitoring different reptiles terrariums. At the same time, i'll connect a 4 relay module (octocoupler) that will turn on/off 4 different 110v heat tapes in each terrarium.
Do I need resistors somewhere in this circuit? Where? And how many ohms?
Thank you a lot