PIR am312

[sundberg84]

@maghac - no and I didnt have time to try the pulldown either. My next step would be a transistor. I see a current reaching 114uA when triggered so the module works but maybe 114uA isnt enough to trigger the interupt? Someone that knows?

[NeverDie]

@sundberg84 said in PIR am312:

@maghac - no and I didnt have time to try the pulldown either. My next step would be a transistor. I see a current reaching 114uA when triggered so the module works but maybe 114uA isnt enough to trigger the interupt? Someone that knows?

I never actually hooked mine up to an atmega328p. I just had it in a test jig, where an nfet turned on/off an LED based on the voltage of the middle pin. That worked fine.

[Nca78]

So I soldered an am612 to NModule PIR shield, put an SR501 lens but unfortunately I experience a similar behavior with some blind zones where I can move with the PIR bothering to trigger. I'll do more tests (especially when playing with sensitivity, it's supposed to be at max value now) but it is disappointing at the moment :(

[gohan]

If you move across its field of view it triggers without many problems but when moving towards the sensor in those "blind spots" you can get almost in front of it without being detected. Agreed it is very annoying

[NeverDie]

I never actually played around with SR501's. Do they have the same type of "blind spot" issue? I know that for professional grade motion detectors, it's not uncommon to have two PIR's inside them. I had always thought it was for avoiding false alarms, but maybe it's more of a coverage issue.

[gohan]

The SR501 I tested at home has actually better range and coverage. I am now testing the radar sensors and they seems interesting as they "see" through walls too :D

PS of course radar sensors are good only for powered sensors

[Nca78]

@gohan said in PIR am312:

The SR501 I tested at home has actually better range and coverage. I am now testing the radar sensors and they seems interesting as they "see" through walls too :D

PS of course radar sensors are good only for powered sensors

Yes radar sensors seem great, I have received one (5.8GHz version with 2 PCB boards) and ordered RCWL-0516. I will test them for detection through my false ceiling, but I'm not sure they will be stable when powered using HLKs ?

[gohan]

there is only one way to find out. :D

[Nca78]

@gohan said in PIR am312:

there is only one way to find out. :D

Yes and I will but I have so much MySensors stuff to finish first, I will have to stay frustrated about that for some time :D

[NeverDie]

I received the generic lens (on the right), which looks different than the SR501 lens (on the left):

I don't know if it's better or worse, as I haven't yet received my am612's. The good news, though, is that it's a very good fit for my primitive breakout board (shown in the photo on the right). I haven't yet received NCA78's breakout board, but I believe we're using the same spacing on our lens attachment holes.

[Nca78]

I received my lenses too today. In black color (but should not change the behavior, it's just for aesthetics).
Exactly the same lens design as the SR501 version. i hope your version will give better results as it's very different.

I'll still install some AM612 PIRs in my home and see if the "problem" is really one when installed on ceiling to detect presence in a room. Else the next solution is to make a board with 2 PIR's with different orientation/rotation.

[NeverDie]

@Nca78

Have you tried mounting either the am612 or the lens at different heights? It seems we're shooting in the dark a little bit as to whether it's even focused as it should be or not.

It's not clear why this sensor would be worse than others in terms of blind spots. Aren't blind spots an optics issue?

[NeverDie]

For anyone who is interested in this topic, I posted some comments about the am612 on this other thread: https://forum.mysensors.org/topic/5986/pir-am312-412-612

It may have some relevance to the am312.