Using Duemilanove with DS1631 temp sensor, LCD screen and old ammeter I found. 30mA range is perfect for displaying room temperatures. Inspired by Chronulator.
Principle is very simple - transistor base is connected to Arduino PWM output and ammeter is connected to after collector resistor. In software I measure temp and set the PWM to what degrees I need.
thats cool!
cambigfoot88 1 year ago