Led Pir Motion Sensor Circuit Diagram. The main component of pir sensor is pyroelectric sensor shown in figure rectangular crystal behind the plastic cap. Pir sensor has 2 preset one is adjustment of sensitivity of its and second is the adjustment of time delay which remain high at output for a duration.
This can be done on perfboard too. Being that a person emits infrared waves the detector is able to detect these waves and react according to the how the circuit is designed to react. This circuit of security alarm using the pir sensor is also works at night in dark.
Circuit diagram motion sensor light circuit diagram.
Pin 1 is vcc which is connected positive 5v supply. So this is very useful for security alarm and security light uses. We place a 470ω resistor in series to limit current so that the led doesn t receive excess current. This circuit of security alarm using the pir sensor is also works at night in dark.
