Pir Sensor Based Security Alarm Circuit Diagram. Here is a simple circuit that activates a relay alarm when a living being a human is detected by the pir sensor. Gsm module s rx and tx pins are directly connected to tx and rx pin of microcontroller and supply by using a 12 volt adaptor.
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Resistors 10kω and 220kω. Pir sensor based security alarm circuit design. 3 another simple pir based alarm circuit.
Apllications this type of motion sensing alarm system can be easily employable for security purposes at banks.
The alarm activates only when the person cuts through the line of the pir sensor. A pir sensor module s dout pin is directly connected at pin 21 p2 0 of microcontroller with a 10k pull up resistor. 3 another simple pir based alarm circuit. Pir sensor based security alarm circuit design.
