Do you run a diesel car - then you probably know that it can be run on veggie oil instead of diesel fuel. The only condition for veggie oil is that it has to be heated to at least 160F(71ºC). Mickey Sklar has designed a device that monitors three temperature sensors.

Veg monitor circuit can be used for:

• monitoring grease temperature level
• determining when to flip from diesel to veg
• detecting cold spots
• detecting clogged filters (rapid grease temperature drop)

Circuit is built around atmega169 which reads three thermistors where each temperature value increase is indicated by LED. You can analyse source code here… and let your car smell like pancakes