Arduino uno r3 atmega16u212/4/2023 This could be because the wrong board type is selected. You may see the above, even if the uploading process fails. This is the processor acknowledging the uploaded data. This is the instructions from the uploading process trying to activate the bootloader. This is because the main chip is being reset by a command from the uploading process. In particular, there should be nothing plugged into digital pins 0 and 1 (Rx and Tx) because that will interfere with communicating with the uploading computer.Ĭhoose one of the simple example sketches (eg. Also remove jumper wires plugged into the board sockets. Important: If you are having trouble uploading sketches remove any connected devices (like shields). If it doesn't, you may have a problem with the bootloader, or the main processor chip (Atmega328P). The "on" and "off" times are 50 ms each, the three flashes should be over within about 1/3 of a second. If you have the Optiboot bootloader (the Uno normally ships with that) then if you press and release the Reset button, or unplug and plug the USB or power cable back in, the "L" LED should flash quickly 3 times. Try a different power supply to confirm which it is. Or, possibly the power supply has failed. If you get 5 V with the USB connected, but not with the power supply then the voltage regulator (marked on the photo) is probably damaged. 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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