the agricultural liquid level automatic control circuit consisting of NE555

Published:2011/8/20 2:13:00 Author: | Keyword: the agricultural liquid level, automatic control | From:SeekIC

If just turns on the power ,the IC (555) ② pin is low level due to the voltage on C3 can't mutations when there isno water in the pool, 555 is set,high level outputby3-pinmakes the SSR end and the motor D is not running. At this point C3,C4 charge respectively through R1, R2, when the voltage on C4 charges to 2/3VDD, IC is reset,low level output by 3-pin makes SSR internal photoelectric coupler connect the AC voltage 220V, motor D has electricity and runs to pump water. When the water level rises to b probe, C4 is discharged through the water, but 555 still outputs low level,the motor D continues to run.



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