What does it mean if the loopback test works without connecting RST to GND?Like many other people, I have a board (Nano 3.0) which suddenly ceased to work. When I first received it, it had no bootloader so I burnt one using a Mega2560 without any problems. Over the course of a couple days, I used the Nano to test a Nokia LCD screen, some temperature sensors, and a few other things all problem-free... then one day, when I plugged it in to try something else, and it seemed have to lost it's bootloader. I've tried to reburn the bootloader unsuccessfully several times, getting the same avrdude verification error which seems to indicate fried flash memory.The loopback test works and everything sent gets echoed back, even when RST is not connected to GND, which gives me the impression the reset button is stuck on or shorted somehow... I've examined the board with a magnifier and do not see any shorts.Anything else I should try?
In 3, "Connect Jumper from RESET to GROUND" is the same to maintain button reset pressed?.
And number 4, jumper from TX to RX, I have to do it in all of the Arduino Mega TX and RX's pins?
Is there a chip responsible of communication
that I can change
or is easier to change the board?
MY UNO WAS WORKING GREAT .. BUTSUDDENLY IT IS NOT RECOGNIZED BY MY PC...I M HAVING TROUBLE WITH MY UNO R3. PC NOT DETECTS IT , I.E "NO DEVICE FOUND PROBLEM" I CHANGED MY CABLE , TRIED ON OTHER PC BUT NO COMPORT , OR NO "NEW DEVICE FOUND"WHAT IS THE PROBLEM ? I HAVE DONE "Loop-Back Test"! BUT GOD KNOWS WHY NO DEVICE DETECTED IN PC ....... HELP ME GUYS'ADVANCE THANKS !
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