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Back-powering via GPIO pin
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Compo:
I have a plug-in module for my 2.4ghz quadcopter controller that I have hard-wired. The controller outputs PPM data and the module (atmega and nrf24l01) takes these and transmits.
At the moment I switch on the controller then the module (it takes 5v from the controller batteries). My understanding is that the PPM output from the controller is backpowering the module chip whenever I have the controller powered but not the module?

I think the solution is to use a MOSFET with the gate connected to the module switch?

Can someone confirm thats right and maybe give some help on how to wire it up?

Thanks
viperidae:
Can you set the gpio to open collector?
Then you won't need an extra MOSFET, just a pull up resistor.
Compo:
Would I have to do that in code? I dont have access to the source.

I have some si2302 n-channel mosfets.

I though maybe I could use one of those on-on-on switches so the power connects then the ppm connects.
langwadt:
could get the equivalent of open collector with a diode and pull up resistor
Compo:
Is an open collector is for the output of a chip? Sorry but I'm not that experienced, I dont really follow
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