Dwalt last edited by
Does anyone have any experience with this sensor?
I exhausted my stock of panasonic PIRs and was looking for a replacement which was low powered and self contained (all components within the can) similar to the panasonics and ran across the am/hm PIR series from Senba Optics. The am312 is the only one I have seen in the wild - $13 on aliexpress but ~$2 from Banggood. I cannot find a non-chinese datasheet anywhere but some wholesalers have listed specs which look promising, specifically detection range and current.
@Dwalt if I understand it correctly, it monitors motion actively? So that it keeps the pin high as long as it keeps detecting motion?
Keep me informed, please. That way I can remove that part from my nodes.
Did you ever find anything out regarding its true current consumption?
acp last edited by
Sorry to bump this old Thread.
But i thought i give some Info in case anyone stumbles on it via searching am312+mysensors like i did some Weeks ago.
I used the banggood Module for a Battery Powerd Node.
At first it was running from 3xAAA Alkaline Batteries.
But after a Week Batteries where emtpy.
So i had a detailed look at the Node.
The PIR Module has a 3V regulator on Board, which seems to be designed for 5V input.
The Batteries only provided ~3,9V wich resulted in ~1,4V behind the regulator, but the Module was working properly.
So i decided to remove the regulator from the PIR Module and power it from 2 AAA Batteries (providing ~2,4V input).
Additionally i removed another 3,3V regulator i was using for the nrf24l01 Radio.
Now the Power consumption is down to ~0,2 mA while sleeping (ATMega328+NRF24l01+Pir Module) and ~15mA when awake.
Running without Problems since 2 Days.
- Rock stable. Even if I use the on-board regulator to also power a MySensors node it does not get into trouble (fires only when supposed to)
- The hold-time is as specified in the datasheet 2.3 seconds
- Power consumption: 14.2 µA! when idle 15.4 µA when active.
- These boards can handle anywhere between 3.3 and 12 V power (ldo on-board).
- I won't be using any of the small or modified HC-SR501 or similar BISS0001 based sensors anymore. These typically have 4 times higher power consumption/ very sensitive to all kinds of power and environment noise/ large/ but adjustable (can live with that and handle in software).
Thanks for your post! What type of detection range are you getting out of it? i.e. within what range can you reliably detect motion?
@AWI - Could you see what happened below 3.3v? Ie, using 2xAA ?
I can't wait to get my pir sensors
Me too. Based on AWI's report above, I just went ahead and ordered them.
@sundberg84 I turned the voltage down to 2.6V and it was still fully functional. Did not test noise sensitivity (disassembled the test set-up) The sensor is specified to 2.7V, the LDO (HT-7530) has a typical voltage drop of 100mV in normal operation.
Seems to be very small (< 5mV) when Vin is below 3V.
Conclusion: looks good for 2AA alkaline.
FWIW, when I click on your specification link, all I get is "Access Denied". Is it just me, or can anyone else here click through to it?
@NeverDie The "specification" is a link back into this forum (https://forum.mysensors.org/topic/6658/pir-sensors/18) so you should be able to access it...
kontrollable last edited by
@NeverDie Same here, access denied!
@hek Seems there's a problem: a simple link back to forum is resulting in "Access Denied." Can you fix it?
You are linking to thread in the moderators private area.
but also it depends on the lens right?
Unfortunately, the link you posted (https://forum.mysensors.org/assets/uploads/files/1493990586841-pir-as312.pdf) reports file not found.
Since links aren't working, can someone upload the pdf of the datasheet to this thread as a file attachment?
[Edit: That's funny: After I posted the link, now when I click on it I'm now granted access! So, I'll attach it to this post now that I finally have it.]0_1494013513879_1493990586841-pir-as312.pdf
Hopefully others can now access the re-uploaded version.
For Halloween, it would be pretty amusing to have the PIR turn on some eyeballs like this:
especially if you had about 6 of them scattered about.