Preventing goods from being forgotten reminding circuit diagram

Published:2011/6/24 2:02:00 Author:Nicole | Keyword: goods, reminding | From:SeekIC

It has two magnetic control switches, they are fixed in the left and right car doors of taxi. Each magnetic control switch is composed of small permanent magnet and reed switch, the small magnet is fixed in the car door, the reed switch is set in the door head, ordinarily, the contact piece inside the reed switch is always in off state. When the passenger gets off, the magnet and reed switch are separated, the contact piece is turned on, 555's 2 foot turns to low level, 555 is set to high level, it provides IC2 with power supply. IC1 adopts 555 time base circuit, the monostable trigger circuit is composed of IC1 and R2, C1, R3, C3. When the car door is open, 555 is tirggered by 2 foot's low level and it is in triplet state, the temporary stability time is td=1.1R2C1.



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