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.
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