My Mega 2560 was working fine with the web editor. All of a sudden, the board is not recognized by web editor. I have cleared browser history and cookies and checked the cable which works fine with my Uno. When I plug com cable to board, green ON led comes on and L led flashes twice like normal.
Hi @docsavage53. Which operating system are you using (e.g., "Windows")?
I ask because I would like to give you the appropriate instructions for your operating system.
MacOS High Sierra ver 10.13.6
OK, I think it will be useful to check whether the board is being recognized at the operating system level. This will let us understand whether the source of the problem is in the Arduino Web Editor or Arduino Create Agent levels of the system, or at a lower level.
Please try this:
NOTE: These instructions will not solve the problem. They are only intended to gather more information which might provide a clue that eventually leads to a solution.
- Unplug the USB cable of your Arduino board from your computer if it is currently connected.
- Click the Apple logo on the left side of the menu bar at the top of the screen ("Apple menu").
- Select "System Settings..." from the menu.
- A "System Settings" window will open. Click "General" in the menu on the left side of the window.
ⓘ You may need to scroll the menu down to see "General". - Click "About" on the panel at the right side of the "System Settings" window.
- The "About" panel will open. Click the "System Report..." button at the bottom of the panel.
- The "System Information" window will now open. Select Hardware > USB from the tree on the left side of the window.
- Take note of the contents of the "USB Device Tree" panel of the "System Information" window.
- Plug the USB cable of your Arduino board into your computer.
- Select File > Refresh Information from the menu bar.
Do you see any new device appear in the "USB Device Tree" panel of the "System Information" window after doing the last step?
No the Mega doesn’t show up, but if I follow same process with my Uno it does appear under USB 2.0 bus.
This is valuable information. It means the source of the problem is at the operating system or hardware levels. The two most likely explanations:
There might be a problem with the drivers installed on your operating system for the USB chip on the Mega 2560 board.
There might be physical damage to the USB to serial chip or related circuit on the Mega 2560 board.
Given your description:
I think it is most likely the latter. It is fairly easy to make a mistake in your wiring that will burn up an Arduino board. An occasional "magic smoke" incident is to be expected as an inevitable part of working with electronics.
In the case of hardware damage, the best thing to do is to first carefully review what you did in order to identify what caused the damage. Next, consider what you can do in the future to avoid the problem from happening again. In this way, you can gain valuable knowledge in exchange for the loss of the hardware. Once you have finished that "post-mortem" procedure, attach a note explaining the problem to the burnt board and toss it in your electronics salvage bin, then buy a new one and get back to having fun with Arduino!
The sketch I used last only has one digital output and one analog input that was between 1 and 3 volts. Not my mistake.
OK, if you are convinced the hardware is still good then you must focus your attention on fixing the problem with the operating system. Think back to any relevant events that happened between the time the board was last in a working state and when you first noticed it being in a non-working state. For example, you might have updated macOS.
The board is obviously bad through no fault of my own. Arduino should replace it under warranty.
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.