New Murata lora chip with integrated STM32

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  • Just came across this lora chip "Murata CMWX1ZZABZ-078" and wondered if there were any plans to make a Espruino LoRa board with it? Its basically a ST Microelectronics' STM32L082 32 MHz Cortex M0+ MCU with 192 kByte of flash and 20 kBytes of RAM and Sematech's SX1276 LoRa.
    Could be a great compliment to the Esprino rage.
    I see that there is already an Arduino board called a Grasshopper with this.
    I guess that there is a way to get Espruino on it but I am not sure how?

  • There aren't any plans to create a board around it at the moment I'm afraid. Murata are one of those suppliers that really don't care much about you unless you're ordering millions - which makes them very hard to deal with.

    There are plans to add support for the RAK813 module (which is an nRF52 and SX1276 LoRa though) as RAK themselves are sponsoring the port. It's got more RAM, Flash, has Bluetooth LE, and there are breakout boards available for it.

    It probably wouldn't be too hard to get a build working for the Murata module yourself, however I don't think there are any STM32L0 parts supported by Espruino yet so it'd probably require some fiddling to get Espruino building against the correct header files. SX1276 is already supported by Espruino but LoRaWan isn't - however support will get added as part of support for the RAK813 I imagine

  • Thats great news, the RAK813 actually looks much better.

    Thanks Gordon. I will look forward to getting my heands on one in the future. Any rough idea when it may be out?

    cheers,
    Nigel

  • Hopefully it'll only be a month or two away. RAK want me to look at another LTE-based tracker first (I'm already doing RAK8211), but then next on the list would be the RAK813.

  • Hmm, cool module. Maybe I should start selling a breakout board for the RAK813 modules like I do for RN2483?

  • Could do - however they do sell the RAK815 (https://www.aliexpress.com/item/RAK815-H­ybrid-Location-Tracker-LoRa-Bluetooth-5-­0-Beacon-GPS-Sensors-LCD-LoRaWAN-1-0-2/3­2849717052.html) which is a pretty full-featured breakout already... something simpler/smaller might be popular though?

  • @Gordon that RAK8211 looks interesting. But expensive. Would you be able leverage your clout with RAK if as a forum we wanted to set up a group buy? Just thinking out loud.

    Also, at risk of asking a dumb question. The lack of a bootloader means we need another expensive piece of kit to work with these and this seems to be common on any BT boards you don't directly produce. But when OTA firmware updates on Puck and Pixl are so easy why is a bootloader not standard feature for these other boards?

  • why is a bootloader not standard feature for these other boards?

    I know :) I think one reason is it's a pretty steep learning curve to get it working - I spent a long time bashing my head against a wall getting it working, and a lot of companies aren't that bothered.

    However RAK have said that they will be adding one to new boards, so we'll see what happens...

    Group buy

    That may well be possible if enough people are interested. I'd have said the RAK813/RAK815 was probably a better contender for that though. The Quectel modems on the RAK8211 are pretty pricey all by themselves, so it may be that RAK don't actually have that much wiggle room :)

  • However RAK have said that they will be adding one to new boards, so
    we'll see what happens...

    Strategically that would be very smart IMO. This stuff has to be OTA updatable.

    I'll check out those other boards and go from there.

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New Murata lora chip with integrated STM32

Posted by Avatar for user91325 @user91325

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