Low power PIR breakout board for Mysensors and evaluation

[scalz]

hi.

I have received pcb. so for the moment it doesn't work like I want. I have not digged a lot. I have just soldered it and powered with two aaa, 3.2v. Led was triggering too much so I checked potentiometers. and it triggers ok but the range is not great for the moment. maybe 2.5m.
So I looked briefly voltage levels with oscillo and I think I need to check and tune resistors to see if it is about comparator window (resistors), pir sensor or the lens.

So no good news, no bad news too. it works well at 1m :laughing:
but I have not said my last word :smiley: I hope to have some time asap. it would be cool if it worked.

another thing too: I will update files. not a big mistake but good to know. the silkscreen for the pir sensor is not well oriented.

Here some pics

[Anticimex]

@scalz cool! Nice work. Did you manage to grab some current measurement to see if it operates within reasonable ranges for battery operation?

[scalz]

@Anticimex : hi :smiley:
I didn't checked at first, because I mounted the led. But I just removed it, and here first results with uCurrent:

• 24uA with no trigger
• when it triggers it oscillates between 24-27uA. so it seems to work as announced in app note.

it just needs to check the opamp res divider (3rd stage comparator) I think. Because when I did some tests, looking with my oscillo, voltage levels was moving well when at 3-4m. but it didn't trigger. so I suspect that it needs to refine the comparator window (sensitivity...)

[Anticimex]

@scalz that's excellent. I believe you really have something here. Battery operated motion sensing would be awesome!

[scalz]

@Anticimex: yep it would be great. Did you order pcb? if you want I can send one to you with pir sensor and its lens (free :wink: I don't know letter postage fee from France to you but it should not be expensive I think.).same offer for you @tbowmo or @Hek :wink:
In other hand, I have not enough opamp...and pots so if you have these in stocks..

[Anticimex]

@scalz Thats very kind of you, but I am afraid I have not got the time to investigate more closely currently. Little baby present and Christmas coming up :)

[freeck]

This post is deleted!

[scalz]

hi.

just a little update, I made few tests (between two projects :persevere: ), trying to see if it could be more low power. And yes it can, it needs for instance to use higher res of course! 10-15M and increasing a little bit capacitors (100nf instead of 10nf) helped to stabilize and I was near 5uA!
Unfortunately, I didn't had big success with my false triggering...and range increased a little bit, a little bit better too with another sensor (LHI968).

But that is not my biggest concern here. And I am curious to know what you think. Like you I am searching a low power PIR <10uA, reliable, and not expensive.
But for low power, we can encounter some case like:

• holidays : lot of triggering breaking sleep mode and low power.
• In deepest sleepmode, we have no time reference for blind time etc...
• So it would require some tricks to handle everything in sketch and finally maybe the overall power consumption would increase a little bit (few uA).

In other hand, @Myna made a board with E931.96. I don't know if he got it working but I think this ic could solves all this problems.
MCU deep sleep mode could be possible, and E931.96 could handle false triggering, blind time before retriggering, low power (I think it could equals to my small board), and finally, not the least, it seems that it autocalibrates regarding the sensor. Very interesting in fact! Too bad, it seems it is available only at professionnal supplier.

So I am asking to professional supplier (Avnet) what could be the availability for this chip. I am already in contact with him for an other interesting chip. It could be great if we could have hand on this ic.
In the mean time, I have ordered some from aliexpress (I hope it's not clone!).

That's all. Thanks for reading, and for feedbacks!

[scalz]

Small is small! and more simple :) I will order it at oshpark.

Component size : 0805
I hope that will work :) I have ordered the ic at aliexpress. Let's see if it is genuine...if yes, it is not expensive compared to opamp..on the previous board. I am dreaming lol!
http://fr.aliexpress.com/item/E931-96-Ultra-Low-Power-PIR-Controller-13/32591606213.html?spm=2114.06010108.3.1.oSY46D&ws_ab_test=searchweb201556_3,searchweb201644_3_10001_10002_10005_301_10006_10003_10004_62,searchweb201560_1,searchweb1451318400_6148,searchweb1451318411_6451

@Hek: I tried to upload another simple eval board at openhardware but I was not able to save/upload it.
" Unable to save project. Please try again later or contact support."
So, I will retry later ;)

[scalz]

just a very small update to tell I'm pretty happy: I have just received my PIR chips order today (e931). Another thing to do now : a lib and look if it's fake but I hope not! stay tuned ;)

[dubanoze]

Scalz, which news about e931 ?

[scalz]

I will post some news soon ;) multiple things in progress (hw & sw) but now I'm better organized to speed up my dev in my hobby time lol

[dubanoze]

You shut down work on TSU104 version?

[TRS-80]

Following this thread with interest! Keep up the great work! :+1:

[scalz]

yep for the moment, I have a lot of e931 to use. but I had some ideas for the tsu104 so I will look at it later but don't know when yet (at the end of my todo..)

[TRS-80]

@scalz said:

I will post some news soon ;) multiple things in progress (hw & sw) but now I'm better organized to speed up my dev in my hobby time lol

I was just thinking the other day, is there any sort of post already going around here like "show off your workbench / work area?"

I am getting ready to purchase my initial supplies and some small cabinets, soldering station, etc. which will be, initially, pretty meager but I thought it would be fun to show off my little area, and I'm sure some people here have much more impressive work spaces that I'm sure many would be interested in seeing. :)

If not, I think I will create one eventually, when I get my area set up. :)

[scalz]

@TRS-80 ahah :) I thought about this too but I need to clean my lab! too much jumble :blush:

[Yveaux]

@TRS-80 said:

show off your workbench / work area?

Bit old, but still fun: http://forum.mysensors.org/topic/229/your-workshop

[hek]

@Yveaux
Still missing a picture of yours!

[Samuel235]

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?

1. 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.

2. 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?

3. 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?).