Hello,
Recently my Arduino UNO stopped to be recognized by computer (using USB), I tried a few stuffs:
– Changed the Atmega328
– Rewrite bootloader
– Tested the controller on other board
– Measure the connection between a few pins using a multimeter
Nothing worked, so I decided to try to update the atmega8u2 firmware that is responsible to control de USB connection, I found two articles that I used as base:
Updating the Atmega8U2 on an Uno or Mega2560 using DFU e também How to upgrade atmega8u2 firmware
Both of them used solutions that needs to soldering a resistor on the board, but I don’t want to solder anything to the board, so I checked next to the atmega8u2 exists the ICSP pins, so I decided to try to burn the bootloader using them. Just to prevent other disaster I removed my atmega328 from board and connected the USB ASP to the ICSP pins. (Remember that the PIN 1 has a number or a little mark near it, mine had a small white circle)
After that, I accessed the dir that contains atmega8u2 hex of Arduino Uno (/arduino/hardware/arduino/firmware), and then I tried to rewrite the bootloader:
sudo avrdude -c usbasp -p m8 -u -U flash:w:UNO-dfu_and_usbserial_combined.hex
It didn’t worked because it is a atmega8u2 and I was trying to write it with atmega8 the error was:
avrdude: Yikes! Invalid device signature.
So I did a little more research and I discover that at90usb162 is almost the same, so I decided to take a shot with force (-F) option
sudo avrdude -c usbasp -p usb162 -u -U flash:w:UNO-dfu_and_usbserial_combined.hex -F
I waited it to burn, turn arduino uno off, connected my atmega328 and then turn it on and my USB just showed up on my computer, so now I can program my Arduino UNO using USB again.
Matheus
PS: Right after the booloader update I tried to Upload a Sketch to atmega328 without sucess, it was out of sync, so I tried to rewrite the bootloader of atmega328, and then everything started to work.
References:
http://8515.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=688637
http://image.pinout.net/pinout_10_pin_files/connector_pinout.php?image=avr_icsp.png&pinout=%20This%20a%20pinout%20of%20the%20AVR%20ICSP%20header.%20(6-pin%20&%2010-pin)
Now adding this to a short list of sites I would defend in a conversation about the modern web, and a look at ideaswithimpact reinforced that defence list, the few sites that serve as evidence the web can still produce good things are precious and this one has clearly joined that small list of exemplary sites.
Reading this with my morning coffee turned into reading the related posts with my morning coffee, and a stop at claritylaunch stretched the morning further, content that pulls breakfast into a reading session rather than just accompanying it is content that has earned a higher claim on my attention than the average article does.