Electronics > Beginners
Modify PIR sensor motion detector circuit
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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