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Author Topic: RFM22 433Mhz radio modem project.  (Read 1040 times)

Offline atomiclama

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RFM22 433Mhz radio modem project.
« on: October 07, 2017, 16:17:30 »
!! warning in progress will change lots.

Ah well time to start a new project, not finished any of my other projects yet but this has got my interest for the moment so time for a brain dump.

I have always been interested in the long range radios but don';t like closed source proprietary stuff. Had a look at the code in OpenLRS it';s all arduino based urghhh.

Recently BF got an RX SPI implementation  ~~ well that has just made my job alot easier.

So I currently have 2 STM32 Nucleo dev boards hooked up to RFM22 radios.

 [ Invalid Attachment ]

The current implementation has created a virtual comport which can have attached to it MSP, Telemetry or any of the other things in BF or a newly comport bridge. The other other side of the RF link is the same. This gives me the flexibility to hook telemetry -> VCP -> RF -> VCP -> bridge -> serial port -> PC. The same for MSP CLI etc.

insert back of fag packet scribble.

Well it works. Telem ok, cli ok if the response is small, MSP so so, MSP is full duplex where as RF is obviously not needs some work.

The idea is to have the RFM22 directly integrated into the FC and one on dedicated HW attached to the TX.

Insert linky / picture of suggested HW
Insert more scribbles .

Anyways there is some interest over in iNav world some might get some where.  ::)

Dump over.



« Last Edit: October 12, 2017, 08:57:52 by atomiclama »
Wasdale X, Ow that hurt

Offline Two-Six

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Re: RFM22 433Mhz radio modem project.
« Reply #1 on: October 23, 2017, 17:03:30 »
WoW! That';s amazing, proper job!
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Offline atomiclama

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Re: RFM22 433Mhz radio modem project.
« Reply #2 on: November 04, 2017, 16:11:29 »
First proper range test, through a clump of trees as well.

6mW setting on the TX, quite impressed.

Screenshot from 2017-11-04 16-06-26.pngRFM22 433Mhz radio modem project.
Wasdale X, Ow that hurt

Offline hoverfly

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Re: RFM22 433Mhz radio modem project.
« Reply #3 on: November 04, 2017, 16:21:26 »
Looking good.. ~~
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Offline atomiclama

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Re: RFM22 433Mhz radio modem project.
« Reply #4 on: February 07, 2018, 19:23:32 »
It's alive

I pulled the EE from one of my trusty CC3D and wired the RFM22 module to the now free spi pads.
Worked out quite neat.

The lunch box houses the base station repeater. Which is my normal RX hooked up via iBus to a dev board.
I'm running a hacked version of betaflight on the dev board that takes in iBus and squirts the RC data out over the RFM22.

I currently have a slow update rate which makes things a bit interesting to fly. :whistling:

Now I just need to tidy up the base, make it a bit more robust and get it mounted on a tripod. Don't think it is going to last too long just chucked on the floor.
« Last Edit: February 08, 2018, 07:49:17 by atomiclama »
Wasdale X, Ow that hurt

Online ched999uk

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Re: RFM22 433Mhz radio modem project.
« Reply #5 on: February 07, 2018, 19:36:14 »
Quad and radio look good. Might be worth rewiring that 4 way extension cable!!!

Offline shawdreamer

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Re: RFM22 433Mhz radio modem project.
« Reply #6 on: February 07, 2018, 19:42:50 »
sod the extension........get on to the lockerbie bomber ghetto blaster......

« Last Edit: February 07, 2018, 19:45:58 by shawdreamer »
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Offline atomiclama

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Re: RFM22 433Mhz radio modem project.
« Reply #7 on: February 07, 2018, 19:51:30 »
Might be worth rewiring that 4 way extension cable!!!

Nah it's perfectly safe  :whistling:
Wasdale X, Ow that hurt

Offline atomiclama

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Re: RFM22 433Mhz radio modem project.
« Reply #8 on: February 07, 2018, 19:52:59 »
Ah be kind shawdreamer.

That thing has been with me for as long as I can remember. It's part of the family.
« Last Edit: March 08, 2018, 09:51:18 by atomiclama »
Wasdale X, Ow that hurt

Offline atomiclama

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Re: RFM22 433Mhz radio modem project.
« Reply #9 on: March 08, 2018, 08:59:34 »
It's very nerve racking flying on a RF link that I have built up myself. Never knowing if it is going to drop out  of the sky at any moment.

But it's been rock solid now for a few weeks no drop outs / glitches / or failsafes. Been out ~200m behind trees etc. Much better than my old flysky stuff.

Just realised I've been running with a 6mW power setting.  :o

Now to start pushing the range.  :evil

« Last Edit: March 08, 2018, 15:41:36 by atomiclama »
Wasdale X, Ow that hurt

Offline atomiclama

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Re: RFM22 433Mhz radio modem project.
« Reply #10 on: March 23, 2018, 13:37:43 »
MK2 is alive and kicking.

Found a use for my battered CC3D.



Wasdale X, Ow that hurt