This adapter converts the power from a 2s – 4s LiPo to a regular 5v outputted through a Micro USB to be plugged into a Raspberry Pi board. I will be using this to power the Pi when I use it as a ground station for my Arducopter.
Parts that you need:
1x 7805 Voltage regulator
2x 25v 10uf electrolytic capacitor
1x Micro USB cable
1x Deans Plug (Whatever Plug you use on your LiPo’s)
1x Small cable tie
Heat source to shrink the heat shrink (I used a hair dryer)
Hack saw to cut the board down to size
Sorry, I due to my extreme frustration I forgot to take build log photo’s. This is the best I could do once I came back to my senses :)
My original plan was to print my own PCB and use that but after two failed attempts I gave up and simply build a simpler version on Veriboard.
I drilled two holes on either side of the out coming USB cable and secured it with a cable tie to avoid the cable being ripped out during use.
The capacitors have been laid flat in order to decrease the size of the board. I had to cut some traces around the Deans as it was shorting to them which would have shorted the 5v output and the input.
The board ended up being around the same size as my custom PCB version would have been, the veriboard version does not include a power LED like the PCB.
Just to prove that it works here is it powering a USB to SATA driver board I scavenged from a broken portable HDD.
All that remained was to put some heat shrink over the entire board.
If you have any questions feel free to ask me, it is a very simple build that can prove very useful to anyone wanting to power a USB board anywhere.
This same board can be used to charge phones when camping by replacing the USB plug for the charger’s plug.