TrigBoardMotion
From Kevin Darrah Wiki
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Low power PIR sensors can be tricky to get right - here's a way to get a push notification any time motion is detected within a room. Since the trigBoard uses less than 1uA of standby current, we need to find a PIR sensor that uses very little current, especially because these sensors need to be "always on". I found one that pulls 10-12uA, so this is a perfect fit for this... plus they're pretty inexpensive.
Parts needed
PIR Sensor based on the AM312: https://www.amazon.com/gp/product/B07GJDJV63/ref=ppx_yo_dt_b_asin_title_o00__o00_s00?ie=UTF8&psc=1
10uF capacitor - any would work that you have lying around.
