Low power PIR breakout board for Mysensors and evaluation
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I'm in the middle of the schematic and parts design for my current project: http://forum.mysensors.org/topic/3449/homini-complete-room-sensor-module.
I'm very interested in the motion detection going on over here, where are you at currently with this development @scalz?
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Would you recommend this for my motion solution, but obviously i'm looking to have this on-board my PCB rather than a module. Unless i decide some change in my initial enclosure design. I could have this mounted as a daughter/riser card on a header.
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Is there any compromises on this board compared to normal motion detection due to its low power consumption or have you just worked wonders and got the power consumption down with no trade-offs in functionality?
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What're your specifications on this board? I'm interested to know your current test results in terms of Power consumption, desired supply voltage, detection range (Would it detect from sitting on the ceiling any movement coming into the room/floor level of around 3m?).
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- not easy question...I would like to have done more tests and tune on the first schematics but when I saw a lot of e931 at ali I wanted to to try this as it was a little bit easier (or not! needed a lib). but there is a big cons on e931. first is not easy to source..and at mouser no stock and not so cheap. So If I would dig in again, I think the app notes described is nice, can be improved..
- all worked as described ;) e931 or appnote. Appnote can be few uA too, just needs care and tests. It can be used in more different ways too as it's analog, it doesn't need an mcu to work, if well tuned ;) like in common pir for instance.
- I have been able to go as low as 5uA with appnote (with component I had in stock). but I have not ran lot of tests to compare all configuration lens (small or common), different pir sensors (I have cheap chinese, and a little bit better LHI...). Could be lower like maybe 1-2uA I think.
I don't remember, how will you power you project? ac or batt? which kind of batt?
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- not easy question...I would like to have done more tests and tune on the first schematics but when I saw a lot of e931 at ali I wanted to to try this as it was a little bit easier (or not! needed a lib). but there is a big cons on e931. first is not easy to source..and at mouser no stock and not so cheap. So If I would dig in again, I think the app notes described is nice, can be improved..
- all worked as described ;) e931 or appnote. Appnote can be few uA too, just needs care and tests. It can be used in more different ways too as it's analog, it doesn't need an mcu to work, if well tuned ;) like in common pir for instance.
- I have been able to go as low as 5uA with appnote (with component I had in stock). but I have not ran lot of tests to compare all configuration lens (small or common), different pir sensors (I have cheap chinese, and a little bit better LHI...). Could be lower like maybe 1-2uA I think.
I don't remember, how will you power you project? ac or batt? which kind of batt?
Okay, well i've been looking at this PIR but the price is a little high and tbh although i know this module is not going to be THAT CHEAP, i would like to keep it airing on the lower sides of things with the amount of things going into this module.
I do plan on powering it via AC mains. This is a HUGE step for me as i've never made a AC-DC converted PSU before. But its time to learn!
The small amount of testing you have done looks interested to be honest. I just wonder if it worth going to that extent to put into this. I'm kind of feeling using the HC-SR501 module as a daughter board or even just copying the circuitry onto my board like your original idea here.
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I would advise you same thing. but maybe hc-sr501 could be enough?? imho you don't need a 1uA thing if you will power it via AC. If I would use AC, this is what I would use I think. Plus, if there is other bigger power hungry sensors, maybe the pir is nothing vs them..
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I would advise you same thing. but maybe hc-sr501 could be enough?? imho you don't need a 1uA thing if you will power it via AC. If I would use AC, this is what I would use I think. Plus, if there is other bigger power hungry sensors, maybe the pir is nothing vs them..
@scalz, I have tried to keep everything pretty low on power consumption with the components that i have chosen. This is costing me a little more than the higher powered components and no doubt, causing me some hard work when it comes to integrating it all together but i feel that the long road that it will go down will be worth every minute with people onboard to develop this module. I'm yet to see something else on the market like this, the only thing is the popular NEST protect products and the FIBARO Smoke detector, which isn't as 'clever' as this hopes to be.
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@Nca78
if i remember well (it's a while), i had things working but not finished to write the lib for it (read&write to it with a serial protocol, one wire only, not the OneWire protocol).
But then i moved to a lower power solution with my low power multisensors rev1.
Since i've changed a little bit my stuff for handling PIRs for lowering cost of the circuit, but still low power, and sensitivity & triggers count should be "tunable".
I also stopped working on e931 because it's exotic and not really available ic, apart from very special suppliers which are mostly interested by big batches.
Do you know where e931 can be ordered?? (don't tell me avn** lol, i already tried to negociate but were not so much interested in osh..)If so, I could take a look at what i did, when more time, as actually my new version should be lower cost i think. -
@Nca78
if i remember well (it's a while), i had things working but not finished to write the lib for it (read&write to it with a serial protocol, one wire only, not the OneWire protocol).
But then i moved to a lower power solution with my low power multisensors rev1.
Since i've changed a little bit my stuff for handling PIRs for lowering cost of the circuit, but still low power, and sensitivity & triggers count should be "tunable".
I also stopped working on e931 because it's exotic and not really available ic, apart from very special suppliers which are mostly interested by big batches.
Do you know where e931 can be ordered?? (don't tell me avn** lol, i already tried to negociate but were not so much interested in osh..)If so, I could take a look at what i did, when more time, as actually my new version should be lower cost i think.@scalz ok thank you for your answer. I saw the link on AliExpress is not active anymore so yes it seems pretty hard to get for quantities lower than 3000 :D
Found 2 websites selling them in small quantities but I don't have so much trust...
(<1$) http://www.dmelechips.com/index.php?route=product/product&product_id=2116
(2$) http://dwmzone.com/en/e-components/293-e93196-ultra-low-power-pir-controller.htmlI just wanted to know if it was worth trying to follow this path if real life testing of AM312/612 is still disapointing, but it seems it's not if you have a cheaper solution with widely available parts.
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@Nca78
oki. well this is mostly because for the moment i would like to have a PIR with as less part as possible and for 2-3.6V range.
but i'll take a look at my old work asap ;) as i already have the boards, and a few e931 in stock.@scalz if you have no time in the coming weeks can I buy you a board + e931 ? I can give you an address to send it in France and my friend will bring it back to Vietnam in August. I used to be a software developer so I can probably try something on the com with the e931 :)
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@Nca78 cool! been a sw dev too, in IT, before hw :+1:
oki i'll tell you what happens (i'm gonna try this w-e, or today don't know), or maybe you should wait a little bit i show my new boards. Perhaps you'll be interested who knows.. :) I had no problems with comms though, i didn't polish my code that's all. I also made a PIR helper for Mysensors. -
@Nca78 i didn't forget what i said ;)
Here, from the logic analyzer, a screenshot of my lib refactor for e931.96. Write (2nd row) and read back (1st row) : ok
just a few things i would like to check, and i'll release the lib, as this chip will be optional on one of my new boards.
