PIR am312
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I just received my samples of the AM312 and ( @gohan as promised) my observations/ measurements. (which are not in line with @acp observations above)
- 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).
@AWI - Could you see what happened below 3.3v? Ie, using 2xAA ?
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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?
@NeverDie It looks like its in specification. My "lab" is not that big... I could easily detect around 5 meters through the open door ;-)
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@AWI - Could you see what happened below 3.3v? Ie, using 2xAA ?
@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.:ribbon: -
@NeverDie It looks like its in specification. My "lab" is not that big... I could easily detect around 5 meters through the open door ;-)
@NeverDie It looks like its in specification. My "lab" is not that big... I could easily detect around 5 meters through the open door ;-)
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?
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@NeverDie It looks like its in specification. My "lab" is not that big... I could easily detect around 5 meters through the open door ;-)
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...
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@NeverDie It looks like its in specification. My "lab" is not that big... I could easily detect around 5 meters through the open door ;-)
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 Same here, access denied!
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@hek @NeverDie @kontrollable My stupid mistake... :blush: I was referring to this from the datasheet Pir-AS312
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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:
https://cdn-shop.adafruit.com/product-videos/1200x900/3356-05.mp4
especially if you had about 6 of them scattered about. -
Missed this thread last week...
Just tested mine today with 3.3V supply and I have similar current consumption, around 15µA on my multimeter but the full board in sleep mode. It's staying active as long as there's movement detected, and seems stable: no interference from NRF24 radio when sending updated state to gateway.But I have poor range, I'm not sure why, maybe the orientation of sensor/lens, or maybe the hot temperature, over 30°C, I will do more tests tomorrow if I can.
I tested with a not very well aligned fresnel lens from a SR501 I can detect at over 4mI've got some AM612 too, with extra setting for active duration & sensibility, and an OEN pin to enable output based on analog signal (on datasheet example they use it with a photoresistor). If I believe the very similar detection profiles in the datasheets it's the same sensor but the AS312 has settings hardwired in the "can".
Not sure if 2 AA/AAA is the best solution, I would go for lithium cells. CR2032 would probably have too short battery life in a busy room (somewhere around 6 months) but bigger cells like 2477 or CR123 (>1000mAh) would last way over 1 year. Compared to AA they have the big advantage of staying over the 2.7V minimum value in the datasheet for most of their life.
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Missed this thread last week...
Just tested mine today with 3.3V supply and I have similar current consumption, around 15µA on my multimeter but the full board in sleep mode. It's staying active as long as there's movement detected, and seems stable: no interference from NRF24 radio when sending updated state to gateway.But I have poor range, I'm not sure why, maybe the orientation of sensor/lens, or maybe the hot temperature, over 30°C, I will do more tests tomorrow if I can.
I tested with a not very well aligned fresnel lens from a SR501 I can detect at over 4mI've got some AM612 too, with extra setting for active duration & sensibility, and an OEN pin to enable output based on analog signal (on datasheet example they use it with a photoresistor). If I believe the very similar detection profiles in the datasheets it's the same sensor but the AS312 has settings hardwired in the "can".
Not sure if 2 AA/AAA is the best solution, I would go for lithium cells. CR2032 would probably have too short battery life in a busy room (somewhere around 6 months) but bigger cells like 2477 or CR123 (>1000mAh) would last way over 1 year. Compared to AA they have the big advantage of staying over the 2.7V minimum value in the datasheet for most of their life.
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Missed this thread last week...
Just tested mine today with 3.3V supply and I have similar current consumption, around 15µA on my multimeter but the full board in sleep mode. It's staying active as long as there's movement detected, and seems stable: no interference from NRF24 radio when sending updated state to gateway.But I have poor range, I'm not sure why, maybe the orientation of sensor/lens, or maybe the hot temperature, over 30°C, I will do more tests tomorrow if I can.
I tested with a not very well aligned fresnel lens from a SR501 I can detect at over 4mI've got some AM612 too, with extra setting for active duration & sensibility, and an OEN pin to enable output based on analog signal (on datasheet example they use it with a photoresistor). If I believe the very similar detection profiles in the datasheets it's the same sensor but the AS312 has settings hardwired in the "can".
Not sure if 2 AA/AAA is the best solution, I would go for lithium cells. CR2032 would probably have too short battery life in a busy room (somewhere around 6 months) but bigger cells like 2477 or CR123 (>1000mAh) would last way over 1 year. Compared to AA they have the big advantage of staying over the 2.7V minimum value in the datasheet for most of their life.
Not sure if 2 AA/AAA is the best solution, I would go for lithium cells. CR2032 would probably have too short battery life in a busy room (somewhere around 6 months) but bigger cells like 2477 or CR123 (>1000mAh) would last way over 1 year. Compared to AA they have the big advantage of staying over the 2.7V minimum value in the datasheet for most of their life.
In most cases I'm planning to use solar and a supercap. Then, no more batteries to change!
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it is all a matter of node size and if you like to have solar panels around the house (never forget the WAF :D )
