Inverse Voltage Control

This circuit creates a voltage inversely proportional to a variable resistance.

The PNP transistor is turned on to saturation. So the voltage through the collector is:

IR1= (VP-VBE)/(R1+R2)

VControl= R3(VP-VBE)/(R1+R2)

Water Level Sensor

[Plant Database], [Soil Moisture Sensor] [Water Level Sensor] [Soil Moisture Meter]

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