HC SR501 Passive Infrared Sensor (PIR) - rac2030/MakeZurich GitHub Wiki
Links
Limitation notes
- Uses 5-20V on VCC
- Arduino Pro mini in the kit has 3.3V
Stuff to first tryout before confirming
- Bypass voltage regulator in order to avoid level shifting
- datasheet for it is https://www.digchip.com/datasheets/download_datasheet.php?id=385508&part-number=HT7133
- Put 3.3V directly on Vout? Bypasses protection diode
- desolder the HT7133 and C101 (22uF cap) out and bridge Vin (middle pin) to Vout (right pin)?
Sample code
Simple test code can be found at adafruit => https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor/using-a-pir