Wanted: RFM69Pi or RFM12Pi?

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1

I’m after another RFM69Pi or RFM12Pi, specifically the 868mHz version if anyone has one spare.

I’d buy one from the shop but they seem to be 433Mhz only now.

Thanks!

2

Yes, we’ve standardised on 433 MHz for some years now.

Wrong - there’s this too:

and add your 868 MHz RFM69CW obtained from the usual suspects.

3

Ah! Thanks for that Robert, I’d missed that.
Is the firmware in the ATMEGA set up to a 433Mhz though?
I suppose I could reflash it is needed.

4

Yes, it will be set to 433 MHz.

I think you can change it via SSH. You need to stop emonhub: sudo service emonhub stop, then use minicom to talk to the ATmega328P: minicom -D /dev/ttyAMA0 -b 38400 and tell it 8b, which should switch it to 868MHz. (? lists the commands and the current configuration.)
[Ctrl-A] [x] to leave minicom.
Then restart emonhub: sudo service emonhub start
That setting should be retained in EEPROM

If that fails, or you prefer, I think the file you need to edit is on your SD card:
/opt/openenergymonitor/RFM2Pi/firmware/RFM69CW_RF_Demo_ATmega328/RFM69CW_RF12_Demo_ATmega328/src/src.ino

when you’ve changed the frequency, compile it and upload into the ATmega328P with

sudo service emonhub stop
avrdude -v -c arduino -p ATMEGA328P -P /dev/ttyAMA0 -b 115200 -U flash:w:/opt/openenergymonitor/RFM2Pi/firmware/RFM69CW_RF_Demo_ATmega328/RFM69CW_RF12_Demo_ATmega328/src/src.ino.hex
sudo service emonhub start

[CHECK the name of the compiled file - I think I’ve got it right but…
My excuse is I’m working on that area, so I’m not running a standard version at present.]

5

Or if using emonhub just edit emonhub.conf [[RFM2Pi]][[[runtimesettings]]] frequency = 433 to frequency = 868 either via ssh or via the emoncms “config” page if running a emonSD image. Job done :grin: