I 'm thinking about doing a build with a raspberry pi, camera module, and touch screen

[G+_James Hughes]

I'm thinking about doing a build with a raspberry pi, camera module, and touch screen. Here's the question, I want to be able to run it off of a battery and switch to a doc wall wart without having to shut down. Would it be possible to use something like a mofee (battery).

 

Any ideas on how to do something like this? I'm going to test how long the battery that I have will last to see if I can get a whole day on one charge.

 

Thanks

[G+_Eddie Foy]

turn on wallwart first then turn off battery.

There are more complicated ways too. A supper cap array comes to mind, but powering the pi, cam an screen is going to have a significant draw.

 

 

I had done something similar, I ran a cron job to put a timestamp in a file every 15 minutes that way I could see how long the battery lasted.

[G+_Ben Reese]

Easiest way is to use your battery all the time and plug it in to charge. If they do the circuitry right in the battery, it shouldn't have any extra wear on the cells.

[G+_Travis Hershberger]

The "easy" way is to order a small board meant to do it.  I have one of the 1A versions that's in use and working well.

1A: https://www.adafruit.com/products/2465500mA: https://www.adafruit.com/products/1944

 

Adafruit even has some Universal Qi chargers and transmitters.  https://www.adafruit.com/products/1944

[G+_James Hughes]

Ben Reese I was thinking of doing this with the 5v usb battery /charger I already have. It wasn't too expensive so if I fry it, it won't be a big problem.

[G+_James Hughes]

Travis Hershberger thanks for the link, unfortunately they are out of stock. I'm going to sign up for a notification when they are back in stock.

[G+_Travis Hershberger]

James Hughes Ok, that's it, I'm keeping the good stuff for myself now, Know It Alls are like piranha's when a good deal shows up!

 

I jest of course, keep it up, if we buy enough stuff from them they may start sponsoring the show!

[G+_Ben Reese]

If we buy enough stuff, they won't need to sponsor the show.

[G+_James Hughes]

Travis Hershberger I wonder there is an instructable or diy guide for the adafruit device.

[G+_Travis Hershberger]

James Hughes I didn't find one.  Really couldn't be much simpler tho.  Plug in a usb power supply to the mini usb port, plug a 1  cell battery into the middle port, and then plug the Raspberri Pi/Arduino into the standard USB port.  I'm not sure what connector type that is for the battery if you get one from somewhere else tho :-/

[G+_James Hughes]

I think I figured this one out. Might have to DIY some connectors so that it can sit in a cradle to allow it to be picked up and hand held.