Automatic Timing Intermit Irrigation Control Circular Composed of 555

Published:2011/6/2 2:56:00 Author:Joyce | Keyword: Automatic , Timing, Intermit Irrigation , Control , 555 | From:SeekIC

As shown in the figure is an automatic timing intermit irrigation control circuit. This circuit constitutes of a step-down rectifier circuit, an on-off control circuit, harmonic oscillators (R5, R6, 555, W2, C2) and bidirectional triode thyristor SCR control circuit etc. The humidity sensors need to be connected into the circuit can be two graphite rods with brass caps on both ends. When the soil is dry, the electric conductivity between the two graphite rods is low, so the resistance is large. After differential pressure, BG1 will cut off while BG3 and BG2 will conduct. When the soil is moist, the resistance between the two graphite rods is small, thus BG1will conduct, and BG2, BG3 will cut off .The harmonic oscillators will stop in absence of power supply, and make tube BG4 and SCR cut off. Therefore, the corresponding pumping motor will not work.



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