A bean sprouts automatic watering controller consisting of 555 circuit

Published:2011/7/8 2:20:00 Author:Fiona | Keyword: automatic watering controller | From:SeekIC

Figure shows the bean sprouts automatic watering control circuit. The controller consists of step-down rectifier circuit, power outage told implement (IC3), timing control circuit (IC1), temperature control circuit(IC2) and so on. The step-down rectifier circuit is VDD = +7 V DC voltage provided by the whole controller. The power outage told implement is controlled by many harmonic oscillator which consists of IC3,R3,R4,C5 and other components. Close the switch K1, when the power cuts, the relay J1 releases, contact J1-1 closes, IC3 starts oscillation due to get electricity, the oscillation frequency is about 1000Hz, the output signal drives the speaker sound to inform the owner that the power goes out.



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