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Portable Pi Power Problems

e14 Contributor

I am working on a portable Raspberry Pi project and am having a bit of trouble finding a power supply that will do what I want it to do. I am looking for something that will step down from 7.4V to the 5V the system will need, as well as allow the system to operate while charging. am I just over complicating things? or is there an off the shelf unit I can build into the system?

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  • If you are using the same screen as Ben, we've successfully tied off the 5V line inside of the LCD to power the Pi, and that's how we'll do it on the improved version of the portable.  Just bring the 7.4V into the 12V input on the screen, then tack a wire out of the 5V output and take it to the Pi.

     

    The downside to this setup is that the regulator cuts out about 6.4ish volts, so you are losing capacity there.  With the new Pi with the boost convertor, we should be able to use the batteries down to a lower level definitely increasing the run time.

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  • If you are using the same screen as Ben, we've successfully tied off the 5V line inside of the LCD to power the Pi, and that's how we'll do it on the improved version of the portable.  Just bring the 7.4V into the 12V input on the screen, then tack a wire out of the 5V output and take it to the Pi.

     

    The downside to this setup is that the regulator cuts out about 6.4ish volts, so you are losing capacity there.  With the new Pi with the boost convertor, we should be able to use the batteries down to a lower level definitely increasing the run time.

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