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pycom / pycom-micropython-sigfox

A fork of MicroPython with the ESP32 port customized to run on Pycom's IoT multi-network modules.
MIT License
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LoPy4 - LORA at 433 MHz #345

Open danfourie opened 5 years ago

danfourie commented 5 years ago

Hi.

I am using a LoPy4 board and try to set up LORA using the 433 MHz band. Nowhere do I find documentation on using the 433 MHz frequency ranges?

I instantiate the LoRa radio with:

lora = LoRa(mode=LoRa.LORA, frequency=433000000)

But when doing a:

print(lora.stats().tx_frequency)

It returns 868000000 and not the intended 433000000.

What should I do to use LORA at 433000000?

robert-hh commented 5 years ago

I made a branch based on a version of the release-candidate from Sept. 1 https://github.com/robert-hh/pycom-micropython-sigfox/tree/eu433 It may work for you at the moment. Keeping that up-to-date is a little bit tedious. Maybe Pycom will add EU433 to the list of supported settings.

robert-hh commented 5 years ago

From the code, frequency=433000000 should work. Note that the values returned by stats() reflect the parameters form the last received packet.

robert-hh commented 5 years ago

I just tested that. With the setting: lora = LoRa(mode=LoRa.LORA, frequency=433000000, region=LoRa.EU868) packets are sent. Note that you always have to start your LoPy4 from power-on or hard reset if you interrupted the LoRa modem or changed the setting. Otherwise it will not work.

danfourie commented 5 years ago

Thank you for the response. Will test again from a fresh power up. Did you test it using the normal firmware/libraries or the branched version that you posted above?

What is the procedure to upload the branched firmware to my lopy4?

robert-hh commented 5 years ago

I used today's code. The branched version implements a EU433 region. At the moment I do not have a binary image any more. I have built that again and made a package which you can install using the pycom updater. You can find it here: https://github.com/robert-hh/Shared-Stuff The file name is LoPy4-1.20.0.rc13-eu433.tar.gz (pretty obvious)

zhoumaomao11 commented 4 years ago

Thank you!

robert-hh commented 4 years ago

The Pycom main line code now supports EU433 in the version 1.20.2.rc10 and up. Branch 'Dev' of the repository.