Mike Sklar sent in his “Greasy Mon” temperature sensor project for his veggie-oil burning vehicle. Don’t be fooled by his statement about purchasing the board. You can purchase one if you want, but all of the schematics, board layouts and source code are available free to use and download. Buy it or MAKE it, your choice!
There are three thermistors which measure temperature changes based on resistance. Each of the thermistor sensors has four LEDs associated with it which the driver can see illuminate as the temperature increases. Each LED that turns on indicates that the grease has increased by 20 deg. fahrenheit in temperature. The temperature range is from 65F – 135F. Due to the sensors being placed on the outside of the fuel hoses the sensor range peaks rather low to allow for the insulation provided by the fuel hose.
Veggie Oil Temperature Sensor – Link
Make an ethernet temperature monitor – Link