πŸ’¬ MyMultisensors

  • Admin


    PCBWay have quoted a few fully assembled boards on openhardware.io but the prices is pretty high as they won't stock/produce larger batches.

    It's a bit problematic to get low price at low volumes (and low financial commitment).

    I suggest hardware contributors to setup some cooperation directly with the manufacturers. You should have a direct channel to them in the closed manufacturing forum here (accessible for all open hardware contributors).

  • @hek Have you considered using the Seeedstudio PCB assembly service? I haven't tried this service as all my PCB's are using old school PTH. But will try them at some point. It says that "Assembly Fee Starts from $25" but there's no mention whether it's a flat fee or it includes some components assembly. The pricing information is rather fuzzy and I wasn't needing the service for time being anyway so I didn't ask.

  • Admin

    Yes, Seeed Studio have access to quote assembled boards (since a couple of weeks back) on openhardware.io, but they haven't so far as it is a bit more complicated (time consuming) to get a accurate price.

    @scalz and I have been in contact with Seed about this particular board. But we've not had time to follow up on some of their documentation requirements.

  • Hardware Contributor

    @scalz said:

    I stencil only what i need πŸ˜‰

    I know it's a probably a bit late now, but have you considered making a separate board only for the PIR ?
    Then the "main" board with other sensors would be (relatively) easy to solder and cheap to produce by PCBA, then people could order the PCBA of the PIR only separately if they need.

    And it would be pretty useful for every other board maker on this forum also as a low power PIR is not a real option πŸ˜„
    I'm thinking about stealing your design to make a dedicated PIR child board, but I'm afraid my routing skills and electronic knowledge are not good enough yet to make a stable solution that will not be rigged by false detection problems 😞

  • Hardware Contributor

    My best wishes for the new year πŸ™‚

    I designed this little pir sensor board last month with an optional lux sensor which i think is a nice sensor associated with a PIR. I will post files soon (I'm recovering today, phew!)
    I also derivated it with MYSX connector, so it could be plugged on some new neat sensebender mk for instance πŸ™‚

    And i've asked a pcba for this sensor board, for curiosity. but i've been busy during december.. let's see what we'll get πŸ˜‰

    But about MyMultisensors. I've designed V2 last month. I didn't need it..just because i wanted to try.
    I've improved cost, changed PIR strategy, new mcu, still low power, and size is 30.5x25.5 ! with all sensors, and a new thing too. I stop talking.I should get the pcb soon and i'll show. .
    Also, that will be a time2time work on the software part because of the mcu choice.

  • Any news about the enclosure ? Or did i miss a comment

  • Hello, this is really an excellent sensor!
    I would like to buy the components for this project, but I do not know which to choose precisely: when I am looking for a capacitor 100n pack 0603 I have 16 V, 20 V, 15%, 20% etc ...
    Do you have a list of references to help us?
    Thanks !

  • Hardware Contributor

    I'll put stl for box soon, i need to check few things, and i'm busy.

    As i've no time for the moment to upload a complete list with manufacturer parts etc.. it's a 3.3v board without regulator, so with passive >6V (for the 100uF for instance) you should be fine. So for others, 16v etc is enough. Rule i use in general, is 2x what my boards need πŸ˜‰

  • Thanks, and is it OK if I buy 16V for the passive too ?
    Like this one http://www.conrad.fr/ce/fr/product/457889/Condensateur-cramique-CMS-0603-Kemet-C0603C104K4RAC-01-F-16-V-10-X7R-1-pcs?ref=searchDetail for the 100nF for instance.

  • Hardware Contributor

    Yes it's OK to buy 16V. And it should be a rule to buy x7r, so you should be good with those.
    But for big values capacitors (used as power reserve), try to take as low voltage as possible on your circuit as leakage is proportionnal to rated voltage.

  • Thank you so much, so I will buy 16V for 1u capacitor or more, and 6.3V for others.
    And is there a rule for active ? (Watts, volts, amps...)

  • Hardware Contributor

    @particle said:

    Thank you so much, so I will buy 16V for 1u capacitor or more, and 6.3V for others.

    No, it's the opposite πŸ˜„
    The higher the voltage rating, the more leakage/losses you will have. It's not important for small capacitors, but for reserve capacitors like 100Β΅F it's better to take as low as possible, basically 2x the voltage used on your board.
    Honestly it's not a big issue if you use 16V instead of 6V, but with a board as optimized for battery life as this one, it would be sad not to optimize the capacitors also πŸ˜‰

  • OK understood, it's clear now ! πŸ™‚
    And yes with the optimization work, I would like to pay tribute to him!
    And is there a rule for active ? (Watts, volts, amps...)

  • Hardware Contributor


    Sorry for being so late, too much pending projects πŸ™‚

    but here is how looks the custom box for my project. I need to polish a few things, especially sort of mounting plate, then i'll release my stl.

    Box is 62x29x 11.6mm
    No nails no screws.
    i don't like to search my screwdriver or needing screws, or a shorting circuit screw.. So when i can i prefer snaps!


    And in real



    See you soon!

  • Hardware Contributor

    @scalz Very good work dude ! What about de V2 ? because i want to build this awesome node but i have read somewhere, you are working on the V2 πŸ˜‰

  • Hardware Contributor

    v2 won't be released soon (not this month sure) because i miss time, also it's not mysensors compatible yet. and not rfm69 too πŸ˜‰

  • Hardware Contributor

    @scalz Oki. And for the nrf24 version ? πŸ™‚

  • Contest Winner

    Unfortunately this circuit and pcb contain a little mistake in reverse polarity protection module. Q1 must be connected as on the following diagram
    reverse polarity
    So just reverse connections of drain and source of Q1, and the next version of your board will contain correct reverse polarity protection πŸ˜‰
    Otherwise your circuit will be powered through mosfet body diode (with a drop to ~0.6V of course) when polarity is crossed. 😧

  • Hardware Contributor

    @Koresh thx for feedback πŸ‘ Files are now updated and added a note

    @tonnerre33 sorry for late reply. yes this will be nrf24 compatible, not rfm69. i'll try to show something soon, time does not help me!

  • Hardware Contributor

    @scalz nrf24 for the V1 or V2? Because if V2 isn't mysensors compatible, i prefer use V1 but in nrf24 version πŸ˜‰