Following the basic principles of dealing with a moisture sensor, the practical application is now in the foreground: it offers itself to the cucumber bed and the problem of monitoring young vegetables in your absence (due to vacation, illness, so on). Nevertheless, it always keeps it moist enough. Neighbors use a once moistened towel; we use a moisture sensor and a threshold to communicate the signal from the Arduino to the relay to the water pump.
For the replicator, a look at the basic project is recommended. For quick success, the enclosed code can be flashed staying with the basics.
On the 20th of May, 2017 part 2 with premium extensions came out.
Update on the 07.07.2017 part 3 with device changes came out. Cucumbers are now online!
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Do not let the Arduino flop into the water bucket: the water pump is inside ;-)
a relay close the second power circle
Schematic for relay and water pump on top:
the relay get power from 5V DC Arduino and will close the 12V DC water pump circuit
This approach can be used universally. An interaction with a relay is triggered by means of the trigger (here, the exceeding of a threshold value of the moisture sensor). This can be a water pump, which switches on and off again as soon as the threshold value is fallen below.
Order your cucumber now!
big water tank with pipe system