Hardware for BME280/PIR/REED Sensors + 433mhz on AA?



  • Hi there,

    I'm experimenting with pro minis and RFM69 433mhz at the moment.
    It's working great so far and I'm very impressed by mysensors.

    I now want to add more sensors in my house (PIR, Reed for Doors, BME280 for room temperature) - some combined, some individual.
    Ideally, they should be as compact as possible and use AA/AAA, one 18650 or even CR2032 (not sure about the runtime) -
    I'd like to stay away from lipo due to safety concerns.

    As I don't have experience in creating my own boards, I'm looking for complete solutions right now.
    I came across the Adafruit Feather 32u4 with RFM69HCW 433 and the Talk2 Whispernode.
    Another alternative I saw is the Pro Mini 3.3V + regulator + RFM69

    Any recommendations? Whispernode looks pretty cool, does anyone know typical run times?

    Thanks a lot,
    Christoph


  • Hero Member

    @chbla for smal battery operated nodes don't forget that there is the MySensors Sensebender micro -> https://www.mysensors.org/hardware/micro



  • I also considered it .. I'm not sure yet what the best - and most compact solution is..


  • Hardware Contributor

    @chbla - there are several options on openhardware.io
    For a really small node you have the slim node: https://forum.mysensors.org/topic/2067/my-slim-2aa-battery-node

    Sorry - missed the 433mhz part! Forget my post..,.


  • Hero Member

    You do know about the adapter boards for RFM69 right?
    With these you get the same pinout as the NRF24 for your RFM69 radios so that you have more options when it comes to other ready made boards.

    Someone linked to a similar board on Osh Park some days ago but I cant seem to find it..
    Edit: Found it



  • Thanks, the adapter boards look nice. I'm still not sure what I should use, experimenting with a single AA cell at the moment.

    Does anyone know how 2xAA compares to 1xAA + good regulator that can squeeze the maximum out of a battery?
    Is it a huge difference?



  • A supercapacitor with a small solar cell would be interesting - does anyone have experience (3.3/5v size of capacitor, solar cell, etc)?


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