555 timer Door minder electronic project circuit diagram

  
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This door minder electronic project is based on a 555 timer circuit and uses an IR beam to monitor door and passage-ways or any other area. When the IR beam is broken a relay is tripped which can be used to sound a bell or alarm. This door minder electronic project is suitable for detecting customers entering a shop, cars coming up a driveway, etc
555 timer Door minder electronic project circuit diagram - schematic

. Because the IR beam is very strong distances over 25 yards can be monitored with electronic circuit. The receiver module consists of an IR receiver module that detects the incoming beam from the transmitter. The IR signal is used to keep a capacitor charged which in turn holds a relay operated. When the beam is broken the capacitor discharges and the relay releases. This circuit must be powered from a 12volt DC supply.



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