Powering Arduino with another Arduino

Projects General Guidance
1

Hi all. I am fairly new to arduino so please be kind.

Is it possible to power one arduino with another. I will have two communicating with each other through the rx/tx, but I only want to have one power source.

I am using a sparksfun weather board (basically an arduino on its own) hooked up to an arduino uno. The uno will then run a lcd and have some other sensors connected in. I want to power the whole set-up with a solar panel.

I could, I guess, power both units from the solar panel directly but was just wondering if the uno would be able to provide power to the weather board.

Thanks for any feedback.

2

if one arduino is functioning normally. then just run 2 wires. one from one of the arduino's 5 volt line to the other arduino's 5 volt line, and one from one ground to the other ground.

if you wanted to power the arduino with one of the other arduino's pin you could use a transistor.

3

Thanks for that, will give the direct approach a go.