# Is my Arduino Uno faulty?

**URL:** <https://forum.core-electronics.com.au/t/is-my-arduino-uno-faulty/10940>\
**Category:** Uncategorized\
**Created:** [6 August 2021 05:16 UTC](https://forum.core-electronics.com.au/t/is-my-arduino-uno-faulty/10940 "2021-08-06T05:16:42Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Geoffrey172055](https://avatars.discourse-cdn.com/v4/letter/g/df705f/32.png) [@Geoffrey172055](https://forum.core-electronics.com.au/u/Geoffrey172055)\
**Post date:** [6 August 2021 05:16 UTC](https://forum.core-electronics.com.au/t/is-my-arduino-uno-faulty/10940/1 "2021-08-06T05:16:42Z")

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I want to resume an Arduino course and in preparation I decided to test my Arduino. I tried to get the onboard led to light up but it was already on when I connected the arduino to the computer. I then obtained and uploaded the sketch to turn the led off but it doesn’t do anything. I decided to purchase a new board to see if it would work, thus confirming a fault with my existing board but the nice man in the shop suggested I ask the hive mind. How do I test my board to ensure that it is working well? If it is then the problem is elsewhere. If the problem is with my computer, then I will come back to you.

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**Author:** ![Jaden130809](https://avatars.discourse-cdn.com/v4/letter/j/5fc32e/32.png) [@Jaden130809](https://forum.core-electronics.com.au/u/Jaden130809)\
**Post date:** [6 August 2021 05:35 UTC](https://forum.core-electronics.com.au/t/is-my-arduino-uno-faulty/10940/2 "2021-08-06T05:35:55Z")

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Hello @Geoffrey172055 ,

Did you upload the Blink sketch included in the Arduino IDE?

If you wrote your own code did you include:  
`pinMode(13, OUTPUT);`

May not be the problem but just in case. 🙂

EDIT: Check if the IDE says `Done Uploading` so we know if the code actually uploaded.

Cheers,  
Jaden

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**Author:** ![BryceT](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/brycet/32/5449_2.png) [@BryceT](https://forum.core-electronics.com.au/u/BryceT)\
**Post date:** [6 August 2021 06:27 UTC](https://forum.core-electronics.com.au/t/is-my-arduino-uno-faulty/10940/3 "2021-08-06T06:27:33Z")

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Hello Geoffrey and Jaden,

Can you send through a screen capture of the error message you get when attempting to upload to the board. The diagnostics in the Arduino IDE are invaluable in troubleshooting hardware issues. Thanks

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**Author:** ![Geoffrey172055](https://avatars.discourse-cdn.com/v4/letter/g/df705f/32.png) [@Geoffrey172055](https://forum.core-electronics.com.au/u/Geoffrey172055)\
**Post date:** [6 August 2021 07:20 UTC](https://forum.core-electronics.com.au/t/is-my-arduino-uno-faulty/10940/4 "2021-08-06T07:20:23Z")

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Thanks very much for the reply. I have to go out this evening. Will get back to you asap tomorrow.

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**Author:** ![Geoffrey172055](https://avatars.discourse-cdn.com/v4/letter/g/df705f/32.png) [@Geoffrey172055](https://forum.core-electronics.com.au/u/Geoffrey172055)\
**Post date:** [7 August 2021 23:14 UTC](https://forum.core-electronics.com.au/t/is-my-arduino-uno-faulty/10940/5 "2021-08-07T23:14:43Z")

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OK, I guess I might be the arduino chimp here. I set up and uploaded the blink sketch from examples and it worked so the board is OK. It is currently blinking away now. I guess it will stop when I upload something else. I’ll go back now and do the whole course again and this time, keep going until I finish it. Thanks for your help and it is great to know about this resource.