Raspi Solar Supply (Using stuff I have in my garage)

Discussion in 'The Projects Forum' started by justgotdangerous, Jun 2, 2014.

  1. justgotdangerous

    Thread Starter New Member

    Jun 2, 2014
    2
    0
    First time poster. I've lurked here for a few months now.

    I have a Model A Raspberry Pi with a camera module that's been sitting in my garage for quite some time, and I want to use it to take pictures of my back yard during the day.

    I have a bunch of random solar cells lying around the garage and managed to combine them into a panel that with a boost converter, should power the pi. I plan on manually turning it on in the morning and having a cron job that shuts it down before it gets dark.

    I want to make sure that if the sun dips a bit, I had a battery solution to shore up the power. I attached a diagram which I think covers that concept (without specifying the individual parts I have), but I would love to hear if anyone has any other ideas or sees any flaws (i've only recently started playing with electronics, so I'm sure I'm making plenty of mistakes).

    Any help would be appreciated!
     
  2. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    Do not include the D2 circuit. Replace D3 with SW1.

    You just use the solar cell to charge the battery (with a back-flow preventer, D1) and power the boost converter from the battery. Move the switch so the boost converter doesn't use power idling with no load.
     
  3. justgotdangerous

    Thread Starter New Member

    Jun 2, 2014
    2
    0
    Why does it always seem that I overthink these problems :)

    Thanks #12!
     
  4. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    Meh. Beginners.:p
     
  5. business_kid

    New Member

    Feb 5, 2013
    22
    1
    Are you sure the solar thing is big enough? For the camera as well? I'd be thinking of a PIC on 3.3V and you might not need the battery at all. Run @ 32.768khz, they consume next to nothing. You would also need to factor in the camera power.
     
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