Doesn't work at all anymore

Official Hardware UNO Family UNO R3
1

Hello guys, my UNO R3 isn't working, also in this DFU-Mode.

One day, I wanted to write some code on it and it's not connecting with the IDE at all, I thought "Maybe switch the device with the IDE on it.", didn't work, I tryed on Windows but no, nothing. I think the RX, TX or L light kept blinking or doesn't light up at all!

If any pictures are needed of the UNO, then ask for them!

Hope it's fixable, else I use it only to try Fans or things that only need 5V/3.3V to work!

2

It is easy to fix, just get another one. From what you say you did without knowing exactly how you did it you most likely fried your Arduino. Here is something to help in the future.

Gil's Crispy Critter Rules for Processor Hardware:

  1. Rule #1: An Arduino is NOT a Power Supply!
  2. Rule #2: Never connect anything inductive (motors, speakers) directly to an Arduino!
  3. Rule #3: Avoid connecting or disconnecting wires while the power is on.
  4. Rule #4: Do not apply power to any pin unless you are certain of what you're doing.
  5. Rule #5: Do not exceed the maximum voltage ratings.
  6. Rule #6: Many Arduinos cannot power transmitters directly.
  7. Rule #7: Before powering your project, take a break and double-check the wiring.

LaryD’s Corollaries:

  1. Coro #1: When starting out, add a 220Ω resistor in series with both input and output pins to protect against shorts.
  2. Coro #2: Invest in a Digital Multi-Meter (DMM) to measure voltages, currents, and resistance.

Note: Violating these rules can turn your Arduinos into crispy critters. For optimal performance, keep your wires under 25 cm (10 inches).

Additional Tips:

  • The L293 motor driver, though common, is inefficient as it can lose around 3V as heat when driving both legs of a motor. Consider using a motor driver with MOSFET outputs to reduce heat loss and conserve battery power.
  • For more on powering Arduino boards, explore this guide: Powering Alternatives for Arduino Boards.
1 Like
3

IF all you did was burn pins, AND your Uno has the AVR chip in a socket, THEN you can replace that chip with a new chip that has a bootloader installed and the Uno will be like new as long as you didn't fry some other part like the little USB chip that connects to your PC.

That is my #1 favorite reason for calling the Uno hobby-friendly! It is also why it's a good reason to buy a few ATmega328P chips and bootload them... but some people did and still may sell bootloaded 328P's.

So hey, don't throw that board out!

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