Hot Water Level Indicator by LM324

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A simple device to indicate various levels of hot water in a tank.
Save fuel bills and the economy of the planet with this circuit. SW1 is a normally open press button switch which allows you to view the level of hot water in a hot water tank. When pressed the voltage difference at the junction of the thermistor and preset is compared to the fixed voltage on the op-amps non-inverting input. Depending on the heat of the water in the tank, the thermistors resistance will toggle the op-amp output to swing to almost full voltage supply and light the appropriate LED.

This entry was posted on Monday, April 21st, 2008 at 8:58 am and is filed under Electronic Control. You can follow any responses to this entry through the RSS 2.0 feed.