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Arduino Forum Powering Arduino Uno Through different inputs
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  • arduino uno
  • power
  • arduino
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Related

Powering Arduino Uno Through different inputs

Adam_A
Adam_A over 2 years ago

Hello, recently I have been doing a project on an Arduino Uno that uses the display, however due to the limited space I have in my project build im unable to plug in power using the normal Usb option and 12v Barrel jack, the only way I could power it is I can wire power from a power supply to the Arduino Uno, I'm aware that I can use the inputs over here (on the power rail) to wire power to the Arduino (Refer to image 1) 

image 1

image

However all of these inputs are occupied and it isn't possible for me to input power from there, so now we are left with the empty slots refer to image 2 (empty slots are highlighted in yellow) 

Image 2

image

My question is that are we able to wire 5V power from the Arduino power Supply (refer to image 3 for power supply) then to the Arduino Uno highlighted yellow slots?? 

Image 3

image 

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to Adam_A +1 verified
    I'd go for these two solder holes (corrected after being reminded by @beacon_dave that VIN is before the regulator)
Parents
  • shabaz
    0 shabaz over 2 years ago

    Hi,

    At a very high birds-eye view they may look like ports or slots which could imply they all serve the same purpose, but that's not the case. Some may indeed work as interchangeable input/outputs but some carry power or other signals and are not interchangeable.

    They are pins that carry electrical signals, and each one's purpose is labelled on the board. Some pins may be duplicated.

    To make any significant use of the board, you'll need to take a less high-level view of the board, examine the labelling against each pin, and check out 'pinout diagrams' for the Arduino.

    If you google 'powering arduino' you'll see this: docs.arduino.cc/.../power-pins

    It precisely tells you which pins you can use for the board.

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  • Adam_A
    0 Adam_A over 2 years ago in reply to shabaz

    I've made my research however most articles (including the Arduino forum you sent) tell me to plug in the VIN ports which as I said are occupied by the display part im using , regarding reading the pinout diagram (schematics), they aren't clear for me on what they do especially that I'm a beginner at Arduino therefore I'm not sure on where to start in terms of reading them

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  • Jan Cumps
    0 Jan Cumps over 2 years ago in reply to Adam_A

    Are you comfortable with soldering? If yes, you can solder two wires to the VIN and GND pins on the underside of the Arduino. Then deliver the power that way.

    If you aren't into soldering, you could try and visit a makerspace, or ask around. There's always someone out there that can do that.

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  • Adam_A
    0 Adam_A over 2 years ago in reply to Jan Cumps

    Yes I can solder if this works

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  • Adam_A
    0 Adam_A over 2 years ago in reply to Jan Cumps

    So you mean from the backside from here I would be able to simply solder to wires in and it should be good to go? Would this not effect the part plugged inside those ports? 

    image

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  • shabaz
    0 shabaz over 2 years ago in reply to Adam_A

    That's not how power works. If you look at a basic circuit with a battery and light-bulbs or LEDs, you can see that circuits can be paralleled. This is 101.

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  • beacon_dave
    0 beacon_dave over 2 years ago in reply to Adam_A

    Solder onto the back of the barrel jack. You should get reverse polarity protection if it is present which Vin normally bypasses.

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  • Adam_A
    0 Adam_A over 2 years ago in reply to beacon_dave

    I was actually thinking of this, however from what I know this only accepts V12 and I'm powering it with V5, If not then the solution is simple which is to just wire it from the barrel jack 

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  • Adam_A
    0 Adam_A over 2 years ago in reply to beacon_dave

    I was actually thinking of this, however from what I know this only accepts V12 and I'm powering it with V5, If not then the solution is simple which is to just wire it from the barrel jack 

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  • beacon_dave
    0 beacon_dave over 2 years ago in reply to Adam_A

    An UNO requires a minimum of 7V to Vin as it goes into the 5V regulator.

    image.

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