I am using LM35 DZ (An Integrated Circuit Temperature Sensor) for checking temperature. When I plug into USB on one PC the temperature readings are pretty stable. It jumps around within 1 degree which is fine for my application. But when I plug Arduino into a USB port on another PC The readings Jumps around changing as much as 10 Degrees. What is causing this and how do I fix this problem. I am not using a resister. Ground is connected to ground, middle pin is connected to analog 0 and remaining pin connected to 5v power.
It works almost perfect on one PC but not another. I have to have it pluggged into PC because I monitor temp, when mixer is running, when heater is on, PH and stuff like that. So i have to have it plugged into USB .