the alarm for overlimt of temperature and humidity

Published:2011/6/20 7:43:00 Author:Ariel Wang | Keyword: alarm, overlimt, temperature, humidity | From:SeekIC

When the humidity of soil in shed is beyond the upper limit of the set temperature,the resistence between the electrode a and b decreases.The neutral point potential of RP2 is lower than 2.7V.D2 outputs high level.D3 outputs low level.VL2 is lighted.It indicates the amount of humidity in shed is too much.At the same time,V is conducted.IC2 is conducted to work.B1 gives out alarm sound.When the humidity of soil in shed is lower than the lower limit of the set humidity.The resistence between electrode a and b increases.The neutral point potential of RP1 is higher than 2.7V.D1 outputs low level.VL1 is lighted.It indicates the amount of humidity in shed is not enough.At the same time V is conducted.IC2 is conducted to work.BL gives out alarm sound.



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