Raspberry Pi noob questions thread

Discussion in 'Raspberry Pi' started by Stitches, Nov 24, 2017.

  1. Stitches 2 and a Half Dollarydoos Staff Member . .

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    What specific amp are you using, and with what speakers?
     
  2. Ewhizz .

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  3. Stitches 2 and a Half Dollarydoos Staff Member . .

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  4. Ewhizz .

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    If I use an RPI 2 max current is 650mA
    With this driver board & 5inch screen:
    https://www.adafruit.com/product/2218

    and a 5inch screen the max current drawn is 500mA total. You can reduce that down 370mA by running the backlight at half-brightness (25mA).
    Teensy 2.0 uses max 28mA.
    The adafruit speaker and amp should use bugger all .

    So that means with a Panasonic 3.6v 3400mah battery , I should get approx:
    Approx 1200ma required from components
    Therefore 3400/1200 = 2.9 hrs of battery life. ??

    Using the powerboost 1000C which outputs 1.8A (adaquate as 1200ma is being drawn) it will take 3400/1000 = 3.4 hrs to charge. ??

    Am I missing anything or stuffing anything up here ?
    Thanks guys
     
  5. notmichaelhill .

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    Hey, so I have a Raspberry Pi 2 Model B, and I had RetroPi installed a few years back. I've barely used it, but now that I've gotten into modding, I want to make a portable version and I noticed that there's a ribbon cable slot for a display screen. What kind of screen should I get? What's the right size? I want to make it small enough to 3D print a protective case and place it on top of my Raspberry Pi case. If you need pictures, I'd be happy to provide them. Thanks for the help, guys!
     
  6. fibbef Wizardry V Completer .

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    Sounds like you’re looking for something like this:
    936D4D3E-40FF-4523-ABB0-97826E090529.png

    Except this uses the pi’s gpio pins instead of the dedicated display connector. I didn’t link to this one since it’s an eBay listing, but I just searched for “raspberry pi screen”. They’re pretty common.
     
  7. FreedomCookie .

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    New to both console modding and RPi here. I'm throwing together my plans for a portable machine running RetroPie on a RaspberryPi B+. I'm doing a GameCube controller layout and looking at the GC+ but I can't tell if there's USB output to solder it to one of the USB ports on the RaspberryPi board.

    Alternatively I might go the Teensy route, which I have yet to know anything about, but I can't figure out which Teensy I'd need. I was planning 16 buttons (ABXY, L/R trigger, dual Z buttons, D-Pad, two Joysticks, and two extra), two analog joysticks and two analog triggers. The GC+ doesn't appear to take as many inputs.

    If anyone can give me more information about either the GC+ or the Teensy so I know which I should choose, that'd be much appreciated!
     
  8. cheese the tallest memer in town Staff Member . . .

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    You could potentially get away with using the pi's GPIO for buttons. There is no USB connection on the GC+, it is specifically made to work as a gamecube controller, not a USB one.
     
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  9. DeoNaught .

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    You can use Rpi's Gpio for game controls(the software I used is called retrogame), But if you plan to use analog sticks, you are going to want to use a teensy.
    since Rpi doesn't do this without some external components
     
  10. Bonicgamer .

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    I've seen some RPi 0 projects where the RPi is soldered to a PCB (Like this project), and I wanted to how that works -like how to get video and audio out- so I can make my own PCB if I ever decide to learn how to make PCBs.
     
  11. cheese the tallest memer in town Staff Member . . .

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    They probably used SPI and I2S for video and sound, the pinout for the header is here

    [​IMG]
     
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