1

I have a 19.5 V power adapter, can I safely connect it to my Arduino? I don't want to damage it. It is very simple, just lights some LEDs, and I don't want to burn the LEDs either.

5
  • 1
    probably not, but 19.5 V is not enough information ... what is written on the power adapter label?
    – jsotola
    Jun 12, 2021 at 0:15
  • 1
    You may want to say which Arduino you have, because there is some variation in a specific answer based on that.
    – timemage
    Jun 12, 2021 at 0:15
  • 1
    45 W 19.5 V = 2.31 A thats exactly what it says Jun 12, 2021 at 1:47
  • 1
    I have a Arduino Uno Rev3 Jun 12, 2021 at 1:47
  • 1
    store.arduino.cc/arduino-uno-rev3 see the Tech Specs tab
    – Juraj
    Jun 12, 2021 at 8:58

2 Answers 2

1

The Arduino Uno has a maximum voltage range of 6 to 20 v and a recommended range of 7 to 12 v

Using it at 19.5 v may work if the power supply is well regulated but it is uncomfortably close to the limits and dropping nearly 15v across the linear regulator on the Uno may cause it to get fairly hot.

1

You can do it but you will have nothing left from the regulator for LEDs etc. The best solution is to invest in a buck converter, they are only a few dollars from your favorite china supplier, sometimes even less then a buck. While you are at it purchase two or three you can then use them to generate other voltages as you progress with the Arduino. I use this method a lot, it is a way to use my old laptop power supplies. If you do not have one your next purchase should be a multimeter, even a cheap one is better than none. Then a logic analyzer, again less than $10.00 US. You could also purchase a 8 to 12V wall wart with maybe about 2 amp output and be safe while probably costing less then the buck converter. Have fun!

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

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