555 toilet floodlight and ventilator automatic control circuit

Published:2011/5/21 4:32:00 Author:TaoXi | Keyword: toilet floodlight, ventilator, automatic control | From:SeekIC

The electronic switch is composed of the CK-4 type magnetic control switch and the VT1，R1，R2. When the bathroom door closes, the permanent magnet ZT and the reed pipe GA get close to separate the two touch tablets of GA, VT1 cuts off, pin-2 of IC has the high level voltage, 555 is in the reset state, J releases, the ventilation fan and light has no power. When someone gets into the bathroom and opens the door, the ZT and GA are seperated, VT1 conducts, 555 sets, J closes to close the J1-1 and J1-2, the ventilation fan gets the power to work, the light turns on. The power-on time depends on the delay time of the 555 homeostasis circuit td=1.1R3C2, the parameter in the figure is about 1 minute, you can change it by changing the R3C2 time constant.



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