Ir Sensor With Relay Module Circuit Diagram. Ir led must be detected by the ir receiver i e. Here is a simple circuit that activates a relay alarm when a living being a human is detected by the pir sensor.
The module contains a special filter called fresnel lens which focuses ir signals onto the sensor element. 3 another simple pir based alarm circuit. There are three ir regions on spectrum named as near infrared 0 75 3um mid infrared 3 6um and far infrared higher than 6um.
Pir motion sensor module and its dome shaped cover inset fig.
You can use any tsop but you need to generate ir of respective frequency as tsop. Pir sensors module comes with three pins for interfacing with any microcontroller. Ir transmitter circuit diagram. Changes in the amount of ir striking the element change the voltages generated which are measured by an onboard circuitry.
