Plant water gauge


Posted on Dec 3, 2012

To calibrate the gauge, connect the battery and press the probes gently into a pot containing a plant that is just on the verge of needing water (stick it in so that only an inch of the probe is left visible at the top). Turn the potentiometer until the `OK` LED lights and then turn it back to the point where that LED goes out and the ''W`, or ' 'Water`, LED just comes on.


Plant water gauge
Click here to download the full size of the above Circuit.

The device should now be properly adjusted.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

VLF Radio Receiver circuit
Nite Rider LEDS
250 Watt PC power Supply
Hf Low-Power Cw Transmitter
Automation of Lamp Relay Controlled with RF
vu meter circuit
Dome Drive Schematic
dark detector led ldr
Economical Desk Lamp For Camping
Ion Chambers
HFC lantern making music controller circuit



Top