I’ve some of these PIR and encountered strange false positive motion detection. In most of my projects, I feed 3.3V directly through the “repeat trigger high” pin.
I tested two setups to find the cause:
- 5V through the Vcc pin
- 3.3V through “repeat trigger high” pin. Power supply through AMS1117-33 and HT7333, respectively.
Both circuits work 100% stable when nothing else happens (left schematic).
When I add an LED to the circuit (see right schematic), each time the button is pushed the PIR data pin goes HIGH for setup 2. Setup 1 is still stable/reliable.
I have no oscilloscope but I measured the voltage. My DMM showed a voltage drop from 3.31V to 3.30V. I added a capacitors (470 µF). No measurable voltage drop but PIR is still triggered.
Any idea how to stabilize it?
Thanks & Best