RFM12B Breakout Board

RFM12B breakout boards
Note to self, don’t put silkscreen text over vias you plonker!

I’m still waiting for the PCBs for the latest revision of my TinyTX board to arrive but these breakout boards for the RFM12B transceiver which I actually ordered on the same day ended up getting sent a few days ahead of it for some reason, maybe it is because I went for a red solder mask for the TinyTX3.

The RFM12B is the radio module I use in the TinyTX, it’s also used in JeeNodes, OpenEnergyMonitor, Nanode, WiNode and the Air Quality Egg to name a few, it’s a very handy little board but it’s a pain to use on a breadboard or with stripboard, I decided I’d had enough of soldering little bits of wire to them so I thought I would get some proper breakout boards made.

RFM12B breakout front RFM12B breakout back

These are for use with a 3v3 supply, for used on 5v you might want to consider the the Jeelabs breakout, I’ve used this before when I built my OpenEnergyMonitor system and they are a great little board and they can also be used on 3v3 if you leave out the voltage regulator, capacitors and resistors and join 3 solder jumpers.

Certainly beats this:

RFM12B stripboard mounting

You can download the files below if you want to order some like mine, I used Seeed Studio as usual and it cost $13.86 (£9.01) for 10 including shipping, you can also order them in a pack of 3 from Circuits.io here but note that you won’t get a silkscreen on that version and it is a lot more expensive.

RFM12B Breakout Schematic

Schematic (PNG format)
Eagle files

These files are also available on SolderPad here.


Open Source HardwareThis is Open Source Hardware licenced under a
Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) licence.


6 thoughts on “RFM12B Breakout Board

  1. Hi,

    This sounds good. When you say one can order 10 for $13, does it com with the rfmb or is it just the breakout board? If it’s just the board (which i am guessing) then one still has to solder the rfmb flat on top of the board like a smd. Correct?

  2. By the way, I like how you broke out only the important pins, made space for the antenna and ignored the rest. Really smart.

  3. Hi Nathan,
    i’ve a short question to the RFM12B-modules. The most posts on the internet regarding the rfm12b-modules say, that you have to connect voltage regulators & resistors, if you want to connect the rfm12b to a 5v supply (like arduino uno).
    In the datasheet stands, that you can connect up to 6V (on some revisions up to 5,4v) on VCC; the other pins are even 6V or 7V max.

    In a german board, there are some people who connect the arduino this way – no voltage regulator, no resistor and no problems.

    Have you made some experience with 5V-supply in the past?

Leave a Reply

Your email address will not be published. Required fields are marked *

Notify me of followup comments via e-mail. You can also subscribe without commenting.