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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.
You can try this.
Can this be modified to use a piezo buzzer?https://circuitdigest.com/electronic-circuits/pir-sensor-based-motion-detector-sensor-circuitThanks.
Quote from: fixit7 on May 15, 2019, 05:18:43 pmCan this be modified to use a piezo buzzer?https://circuitdigest.com/electronic-circuits/pir-sensor-based-motion-detector-sensor-circuitThanks.Sure easy peasy , learn about transistors and or fets and use one in place of the led, to drive a buzzer.