HiLetgo 3pcs AM312 Mini Pyroelectric PIR Human Sensor Module PIR Infrared IR Sensor Body Manual Motion Infrared IR Detector

Working voltage: DC 2.7-12V.

Top Positive Review

These are tiny and don’t require any adjustments to use. All of them worked perfectly for me. The range is probably 10-15 feet. They do need a ‘warm-up’ period before they start giving consistent readings. As soon as they’re turned on, it runs for 2 seconds, but it usually takes about a minute before the readings are consistent. I use these with 3 volt logic micro-controller. Definitely recommend.

Top Critical Review

The pin diagram in their pictures is incorrect. Looking at the positioning of C1 I would picture the sensor directed at me with C1 facing away from me (the correct orientation) However in that positioning unfortunately their VCC would be GND and GND would be VCC which I found out after I made magic smoke appear. Overall pretty good product just misleading diagram.

Customer Questions & Answers

could the sensitivity be adjusted?
Answer: No, only the sensitivity and frequency of detection can be adjusted. This is what I heard from other uses, the information may not be correct. I wish I was certain. Good luck.

How long do these supply power after triggering?
Answer:

The AM312 has a repeatable trigger: the sensor output goes high after the delay period (2 seconds), if there is human activity in its sensing range, the output will remain high until the people left after the delay, it becomes low (ie: sensor module detects the human body every activity will be automatically extended a??

Can the sensor range be adjusted?
Answer: Only the sensitivity can be adjusted, not the range.