LM35 and Heating Bed - power supply

S

swmitchell

Guest
#1
Hi everyone,

Picked here because I think I have a power supply problem. (apologies if I guessed wrong).
I have an ATMEL avr 328pa chip and a lm35 temperature, a irfz44n and a 10ohm resistor (for heat).

My problem is that my lm35 analog signal changes as I turn on / off my heater. it jumps up and down by about 1V as that transistor ticks on and off.

The 1 power supply (5v) supplies power for everything. it's a little switch mode power supply (10W max it says).
I get the same problem if I...

LM35 and Heating Bed - power supply