The circuit shows a PIR module connected to a npn and pnp transistor and a relay. This configuration allows, lights to be turned on when the PIR module sees an infrared pattern occur (when a person or warm blooded mammal goes in front of the module.With the 2 1000uf capacitors, the module turns on and stays on for about 1 minute. To increase or decrease the length of time, you would reduce the capacitor ratings to decrease time and increase capacitor capacity to increase time.
The diagrams below, show the pinouts of 2n2222 and 2n2907.
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| Pir Module |
