When I connected my - & + probes to Gnd and 5v of my arduino uno it shows the voltage 3.08. According to my experience I think it needs to display 5 volts but it doesn't.
Can you reply me asap for this scenario
I need quick responses please!!
Thanks in Advane,
What type of Arduino is it?
How are you powering your Arduino.
You probably have too much load (too many things) attached to it.
Displaying 0 can also be normal....
Quickly, post a schematic.
Quickly, post an image of the project.
yeah I will sooner wait
Uno
DC Jack
No, I didnt connect anything
I didnt do any project friend My arduino 5v is not showing its correct voltage not 5v
Could you post an image of your board under test? Show the board, and the DMM reading.
And all this is not happening at
speeds.
If you need quick responses, then we need the same thing from you.
and a picture of the 9V battery plugged to jack 
2 Likes
Are you by any chance feeding a 5V supply into the DC jack?
The DC Jack connects to the input of a 5V regulator.
The recommended voltage to apply here is 7V - 12V. See the 'Tech Specs' tab here.
A voltage regulator needs to have a supply a few volts higher than its output voltage.
If you supply a 5V regulator with 5V then it will 'drop out' of regulation, and give less than 5V out - probably around 3V.
Yeah I know but John, I plugged 9 volts!! It doesnt light up any bulb in my arduino bro!!!
So i win my bet!!!!!!
9V batteries have enough voltage to power up your bare arduino board. Thing is thoses batteries have very limited storage current capacity, so you will empty it very quickly!
Use your DC jack from a wall adaptater if possible, or with USB plug to your computer.
If you are using a 9V battery like this.
Expect short run times and many issues involving low power.
Yeah thats the thing that I did but it didnt Work 
yea, you can try to connect aref to 5V
Hi,
Can you take some images of your project and post them for us to see?
Show it with the battery connected to the DC socket?
Do you have the correct polarity of the wires to the DC plug that goes in the DC socket?
Have you measured the voltage of the 9V battery?
Thanks.. Tom.. 
Yeah it was 8.75V so...
I just plug the 9v battery I disaasembled the project!
Hello Friends, Sad to say that I burnt my 3.3v regulator of arduino
I need the answer how to fix it orelse can we work with arduino uno without its 3.3V regulator I need help guys, I request quick responses from you all.... becuz I am in the middle of my arduino project guys!!!
Thanks, in advance..