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

Perfect for use with Raspberry Pi. Wide input voltage range, no adjustments. Output is always 3 Volts regardless of power supply. These will not directly drive an LED so if testing that way, use a 2222 or similar transistor. Sensitivity is better at 5V or higher than at 3V. All of mine worked right out of the package. I will build something to mess with the cat!

Great little PIR sensor, great range and sensitivity. Works as advertised. all three worked.

Works Fine. The output pin wouldn't drive my LED bright enough, so just added an external transistor driver as shown. Decent performance for the price. Was able to detect motion (for my application) up to ~8ft, any more than that resulted in inconsistent detection.

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.

I've had some PIRs like this in the past and they worked fine. Unfortunately, like others are saying, the QC on these are terrible. All three PIRs like to go off randomly. I can't get a consistent reading. I really thought my code was wrong or that my ESP8266s were acting up. I spent A LOT of time and effort before finally realizing that the problem are the PIRs themselves. Go elsewhere.

I am giving it just 3 stars because it does not work well when powered with 3.3V. It essentially shows a low at 1.7V and a high at 2.7V. Requires circuitry to bump up to logic levels.

It has radius of about a meter and half. But good stuff to play with

The 3 HiLetgo 3pcs AM312 Mini sensors are small, sensitive and work well as a DIY motion sensor. I add lights and sound to keep the bear out of the garbage. All I need now is to wait for the bears to wake up and see if it scares them off. Great for DIY projects or repair.

Articolo che rispecchia quello descritto nella pagina. Da segnalare che la copertura in plastica che si trova nella parte superiore del sensore si stacca dalla sede con facilita' ma basta un po' di colla per ovviare al problema. Rispetto al fratello maggiore HC-SR501, l"AM312 ha un'angolo leggermente piu' stretto ma non di certo funziona male. Molto discreto puo' essere utilizzato in progetti dove lo spazio per l'installazione e' molto ristretto. Non e' possibile tramite hardware o software modificare tempi di funzionamento o sensibilita' o rimanere eccitato in caso di movimento. In pratica tale sensore funziona come un'interruttore...se qualcosa passa davanti lui da il segnale stop...

This device works perfectly and responds shortly in more or less 2 seconds.

Dan un falso positivo cada 10-15 segundos. Compré estos porque me pasaba lo mismo con los HC-SR501. Si alguien sabe por que pasa que me lo diga.

Ultilizzo questi IR come sensore PIR di un antifurto realizzato con Node Red. Devo dire che funziona benissimo i rilevamenti sono curati e costanti ma, come ho letto su.mti forum, entro i 3 metri. Nel mio caso entro i 3 metri va benissimo. Di più fatica. Consigliatissimo

Se volete vedere come funziona collegatevi al mio canale Youtube , cercate : in ufficina con Grisù Gino , mi raccomando iscrivetevi al mio canale per rimanere sempre aggiornati .