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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)
  • Andrew J
    0 Andrew J over 2 years ago in reply to Jan Cumps

    Yes, good point Jan/Dave - I missed that too.  Could I just add that the 5V connection there is the 5V rail used across the UNO and any plugged in boards.  You must be very careful not to over supply to this pin, it should preferably be a regulated 5V supply, and for safety's sake you should not connect power to the USB or Barrel Jack whilst it is powered through that pin.  

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

    You can power a standard UNO through the 5V, if you don't connect other sources (check UNO Rev3):

    docs.arduino.cc/.../power-pins

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

    I did indeed try and "supply" power through the 12 Hole port thing however this ended up with my Power Supply Auto Shutting off to prevent shorting I guess. 

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

    Do you have USB plugged in?

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  • Andrew J
    0 Andrew J over 2 years ago in reply to Jan Cumps

    As I said, and it should be regulated.  Also, check what current that board can provide through its 5V port vs the current required by the Uno and display (whichever need is greater.)  It should be ok, but it's worth checking. 

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  • phoenixcomm
    0 phoenixcomm over 2 years ago

    imageOk, you now face the Arduino Dilemma!! You can't mount it, and it's not planed out well mechanically. I buy mine without pins or headers, then solder my own LONG-TAIL wire-wrap pin/header in place. Click on the image, please. This is how most of my Arduinos are mounted to my custom-made PCB base plate. On my base plate, I have male Wire-Wrap® pins and other goodies. 

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

    If you don't want to solder directly onto the school UNO board, then you can always insert a 'proto shield' between the UNO board and the display shield.

    https://store.arduino.cc/collections/shields/products/proto-shield-rev3-uno-size  

    It breaks out all the header pins to solder pads.

    It depends if you are limited by height or not in your application.

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