I obtained a UNO from a friend and when i tried using it i could not get a com port to suit. On checking Devises it comes up with USB SER.
Any hints ?
That's not an original Arduino Uno. It appears to use a CH340/CH341 USB-to-serial converter instead of the ATmega16U2 used on an original Uno R3.
You most likely need the WCH CH340/CH341 USB-Serial driver.
Search for:
WCH CH340 CH341 Windows driver
or CH341SER driver.
After installing it, the board should appear in Device Manager under Ports (COM & LPT) as something like USB-SERIAL CH340 (COMx).
If it still doesn't, open the device's Properties → Details → Hardware Ids and post the VID_xxxx&PID_xxxx value here. That will identify the USB chip exactly.
I assume you're using Windows. You can check the VID and PID by opening the device in Windows device manager, select the Details tab and select Hardware Ids.
For the mentioned CH340 it should look like
If you have problems, the VID and PID can help us to help you.
The serial-to-USB converter (IC closest to the USB port) does not seem to have visible markings on it. That can cause upload problems in which case UNO stopped working after having worked for years - #24 by ptillisch might provide a solution.
Can your friend provide details? E.g. did it work when he was using it? On the same operating system (Windows, Linux, Mac)?
PS Apologiesd at @InquisitiveMind, I see that he posted the VID/PID story already.
Hi. i have unistalled and reinstalled the CH340 driver and still not working.
Under properties- drivers not installed(code 26).
When update driver- none found.
It looks like a bin job.
Before you bin it, please post the VID and PID that sterretje asked for in post #2 + #3.
Reinstalling the CH340 driver won't help if the USB chip isn't actually a CH340.
Hi. I tried everything with no joy. I tried using windows 10 and it works. It must not like windows 7.
Thanks for your suggestions.
The VID 0x0834,
PID 0x5740 as shown on Windows 10.
Where did you find the VID/PID? In Windows 7 or in Windows 10?
That VID/PID is for a STM IC; see Virtual COM Port — USB 0483:5740 — DeviceHunt.
You can try to find a driver: windows driver for vid 0483 pid 5740 at DuckDuckGo. From the first result
So maybe you can install a driver using the information on that page.
Found using Windows 10.
I will look into those drivers.
Thanks
You should be able to see which driver is used in Windows 10; might give an indication what you need.
I will check on that. Thank you.