Using RFM12Pi V2 and also Power over GPIO possible?

Submitted by giovanne on Wed, 14/01/2015 - 18:57

Hi,

because of other attached equipment I need to power my Pi vi GPIO Pins (5V/GND).

Is this possible?

The RFM12Pi sits over the 5V pin, but isn't used, or?

Thanks for help

giovanne

Re: Using RFM12Pi V2 and also Power over GPIO possible?

Submitted by mharizanov on Thu, 15/01/2015 - 05:40.

Don't use 5V on the RFM2Pi because that will kill the radio module, it is a strictly 3.3V device;
Powering the Raspberry Pi from GPIOs may be risky, but possible: see http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=10500

Re: Using RFM12Pi V2 and also Power over GPIO possible?

Submitted by Eric_AMANN on Fri, 16/01/2015 - 15:08.

Hi,

I met a similar problem when trying to connect a LCD screen to my Pi (equipped with a RFM12Pi).

I used the P5 header which is a secondary GPIO port. You will have to do some soldering. In my case, I soldered a right-angled male header on top of the board. Sorry, no photo, but everything goes in a standard case.

Eric

EDIT : the P5 header is only available on the Model B Rev2

Re: Using RFM12Pi V2 and also Power over GPIO possible?

Submitted by giovanne on Wed, 21/01/2015 - 07:55.

Hi Martin,

I don't want to use 5V for the RFM12Pi. The RFM12Pi will be used as it is.

But I want to power my Pi from GPIO. Already done on one Pi system.

Now I want to power my Pi from GPIO and also use the RFM12Pi on the same Pi.

Because the RFM12Pi sits over the 5V Pin2, my question is, if the 5V Pin is used from the RFM12Pi Board? I think not.

If it is so I can connect mit power supply like I have already done to the GPIO Pin2 and that has no effect to the RFM12Pi Board.

Am I right?

Thanks

giovanne

Re: Using RFM12Pi V2 and also Power over GPIO possible?

Submitted by giovanne on Wed, 21/01/2015 - 12:19.

OK - I have tested it. Like on the schematic on http://wiki.openenergymonitor.org/index.php?title=RFM12Pi_V2 the corresponding 5V Pins on the RFM12Pi Pin 1+3 aren't used.

I have connected my power supply there and everything ist working.

Pi is powered vi GPIO for the hyperion ambilight setup.

And parallel the Pi is getting / sending data over RFM12Pi ;-)

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