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| Simple solar plant watering alarm circuit Posted: 09 Mar 2016 07:13 AM PST This is a simple Solar plant watering alarm circuit. It will sound alarms when the soil is dry. The trees have died. It the solar sell is 6V DC power supply. Thus saving convenience and does not require batteries.No noise at night. How the circuit works As circuit diagram in Figure 1 Figure 1 the circuit diagram of the Solar plant watering alarm. The main principle is that when the soil is dry, with high resistance. However, when the soil is wet with minimal resistance. Usually the wet soil will have resistance is about 6K the electricity current will flow to the probes to base of transistor Q1-2N3904 ,makes it works conducting current from the positive voltage to CE to The post Simple solar plant watering alarm circuit appeared first on Electronic projects circuits.  |
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