Attached is my program for measuring the liquid level in a septic holding tank and for measuring the temperature and humidity in the tank's headspace.
The system uses the following hardware
Newhaven LCD, Model NHD-0420D3Z-FL-GBW
Parallax Ping ultrasonic sensor
Atmel ATtiny4313 microcontroller
MaxDetect RHT03 temperature and humidity sensor
The coding for using the MaxDetect is based upon work posted by Peter Maroudas on this forum.
Alan Hosler
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