Automatic plant waterer


Posted on Nov 30, 2012

The unit consists of a sensor, timer, and electric water pump. The sensor is embedded in the soil, and when dry, the electronics operate the water pump for a preset time. The circuit is composed of a level sensitive Schmitt trigger, variable time monostable, and output driver. When the resistance across the probe increases beyond a set value (ie, the soil dries), the Schmitt is triggered


Automatic plant waterer
Click here to download the full size of the above Circuit.

C2 feeds a negative going pulse to the monostable when the Schmitt triggers and R2 acts as feedback, to ensure a fast switching action.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

100W Audio Amplifier
100Mhz-vhf-crystal-oscillator
Sequential Flasher
Water Level Controller
timer 555 schematic
micro stepper
Measuring Inductors
misc
Electronic Lock
White LED Array Lamp
DC Motor Control circuit
Homebuilt video digitiser MkII circuit description



Top