current community

your communities

more stack exchange communities

Stack Exchange Inbox Reputation and Badges
tour help
Sign up ×
Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. It's 100% free, no registration required.
up vote 0 down vote favorite

The day before I got my used full package arduino uno. I tested it on USB plug. Everything worked fine. I wrote a piece of testing code and uploaded. After I have accomplished with the test I have unpluged arduino from PC and connected to battery and I see that it does not work. I have used a multi-tester to find out the voltage. It showed 4.7V. Now I wonder should I buy a new battery or there is another reason for this. Anybody, please suggest me what to do. Update The battery came with arduino set. It is written that it is a 9V battery. I am plugging it to the battery input in my arduino uno. Polarity is ok. The same program working on connection via usb, does not when connected to battery.

share|improve this question
2  
What kind of battery? How did you connect the battery to the Arduino? Did you check the polarity? –  Edgar Bonet Jun 16 at 13:36
    
@EdgarBonet updated by question. –  zazu Jun 16 at 15:38
    
Do you read 4.7 V between "Vin" and "GND" or between "5V" and "GND"? Does the "ON" LED light up? –  Edgar Bonet Jun 16 at 15:41
    
@EdgarBonet I think I got the point, the "ON" ligth has not turned on. So it means that the power supplied by battery is not enough to run the arduino? –  zazu Jun 16 at 15:45
    
What does your DMM say? –  Ignacio Vazquez-Abrams Jun 16 at 15:51

1 Answer 1

up vote 0 down vote

Did you make sure the battery is charged? Does it have enough voltage to power the board? Remember that Arduino has internal voltage regulator, so you need something little more than 5V in order to get it working okay.

(Comment by bpinhosilva re-purposed as an answer so this will stop showing up as unanswered).

@bpinhosilva you are right, the battery was not supplying enough power to make arduino work.

Please accept this so that the number of unanswered questions goes down. :)

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.