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Modify PIR sensor motion detector circuit

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fixit7:
Can this be modified to use a piezo buzzer?

https://circuitdigest.com/electronic-circuits/pir-sensor-based-motion-detector-sensor-circuit

Thanks.

soldar:
Yes but wouldn't it be simpler to just buy one with a buzzer? Like the ones they have in stores when a customer walks in or out. They are very cheap.

fixit7:

--- Quote from: soldar on May 15, 2019, 09:41:47 pm ---Yes but wouldn't it be simpler to just buy one with a buzzer? Like the ones they have in stores when a customer walks in or out. They are very cheap.

--- End quote ---

I could but I would not learn as much.

And I want to be able to modify the circuit.

soldar:
You can try this.

floobydust:
The HC-SR501 IR motion sensor uses the BISS0001 motion sensor IC. It has a weak output. You need to add a NPN transistor to drive piezo beeper or relay.
For more information, look for BISS0001 circuits.

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