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

    I'll be using the headers on the top to wire V5 to the Arduino, but my only issue is that where can I plug it in if there is a part already occupying the place where it can be plugged in to supply power if you refer to image 2 for the empty slots I have

    image

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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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  • Andrew J
    0 Andrew J over 2 years ago in reply to Adam_A

    Ok, as Jan has said, you can sling a wire from your power supply's 5V and GND ports to the VIN and GND port on the header.  Go in from underneath if you don't have the space under the display board.  We'll have to assume that it works like a standard Arduino UNO which does allow this - you could test it first perhaps before actually soldering.  If you have the space underneath the board when it is mounted in a case, you could actually solder in some headers to those holes and then just use standard dupont ended wires like you would use to plug into the standard headers.

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  • Jan Cumps
    +1 Jan Cumps over 2 years ago in reply to Adam_A

    I'd go for these two solder holes (corrected after being reminded by @beacon_dave that VIN is before the regulator)

    image

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

    Yeah normally wiring power to these does actually power the Arduino, however as I mentioned my issue was that these were occupied. 
    Now that I know these can be soldered I'll give it a try and see if it works, thanks for the help!

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  • Adam_A
    0 Adam_A over 2 years ago in reply to Andrew J

    Here is an actual picture of my board, it says UNO on it

    image

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

    Looks like a clone that has taken advantage of the smaller ATMega SMD version, to provide extra access to the signals and power rails.

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

    Yeah I plugged in an LED to these and it lit up, however you cannot reverse power through them as far as I  know.

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