You should still see the same voltages on them. If you are using, or planning to use, the power jack (marked "power in" on the photo) disconnect the USB, and plug in a power supply - which should be 7 to 12 V DC with positive on the center pin. If you do not get 5 V with the USB cable plugged in make sure the other end is connected to your computer.
Also test between the 3.3 V pin and the GND pin - you should get 3.3 V.(You can buy a cheap multimeter for around $10 if you don't have one, but you are better off getting a better one for around $50 - check all the electronics web sites and stores.) You should get a reading of around 5.0 V (I got 5.04 V on mine). Use a multimeter and a couple of jumper leads to test between the 5V pin and the GND pin (arrowed at the bottom). Plug the board into your computer with the USB cable and check that the green "On" LED lights up. It doesn't mean that something is erroneously sending data. They only illuminate if you are doing serial communications via USB, not if you have something (like a GPS) plugged directly into digital pins 0 and 1.Īlso note that since the "L" LED is connected via an op-amp, it may illuminate if pin 13 is set to an input in your sketch. Note that the Rx and Tx LEDs are not connected directly to digital pins 0 and 1 on the board (marked Rx and Tx). Rx and Tx LEDs (yellow) - these indicate if the USB chip (Atmega16U2) is receiving or transmitting.Indicator LED (yellow) marked "L" - connected via an op-amp to digital pin 13.Voltage regulator - this converts incoming power from the power jack to 5 V.Atmega328P processor - this is the "main" processor which has your sketch on it.Atmega16U2 processor - this handles the interface to the USB connection.It has multiple major components, and possibly only one has failed (if any). Īn "Arduino Uno" is not just one thing that might fail. Unfortunately that particular one had a SMD (surface mounted) processor chip, so it isn't easy to try swapping it with another chip. I've got quite a few Arduinos, and over the last few years have only ever "bricked" one, and I think that was by zapping it with static electricity.
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