How to power the large breakout board

Jul 19, 2019 - 11:29 AM

  • I am a softie, looking to start with hardware and got the Pi to start out with.

    First stumbling block - how do I power the device via the large breakout board?

    Can someone point me to a URL for something that I can buy? And tell me how to connect it.?

    Embarrassingly basic, I know, but we all have to start somewhere ;-)

  • Here's what I did. On Amazon, I ordered a Meanwell power supply model number RD-35A for somewhere around $23. That is a dual 12v and 5v power supply. I chopped off the end of an old monitor cable and added some crimp on connectors to provide 120v to the power supply. Using a multimeter, I determined the V1 connection was +5.2v, the common was Ground and the V2 connection was +11.9v.

    Then I ran wires from the V1, V2 and Ground to the three screw connector on the same side as the USB ports of the large breakout board. Note that the right side of the terminal block is marked +5v and the left side is marked +12v. Place the common (ground) into the middle, and Voila, we have power. If I were really smart, I'd have selected a cord that has a power switch inline somewhere. As it is, everything runs from a power strip, and I use the switch on it after doing the shutdown routine on the APi.

    The only reason for the dual power supply is to provide 12v to the audio amplifier that is in the APi. If you are going to be using an HDMI monitor with speakers through the HDMI connection, you can just look for a similar power supply on Amazon that provides 5 volts at 4 amps to be sure you have enough. It will probably be somewhere around $18.

    This post was edited Jul 19, 2019 09:14PM
  • This is a 5V 4A power supply that comes with a pig tail barrel jack that is screwed into the breakout board

  • Hi Kenneth, how I can find the adopter cable that is connecting the power supply to Pi in the 2nd picture? In other words, what the right keyword to search to find a cable like that?

  • The barrel connector?
    one linked above is inner(positive) diameter 2.1mm and outer(negative) diameter 5.5mm

  • If you want to drive speakers with the amp, get something like this to supply 12v along with 5v