It indicated that all CH340 based arduino board fail be detected.

[ulion]

I tried all my arduino boards, all of them failed, except one which is not using CH340 as usb-ttl module.

There are a lot cheap arduino boards using CH340. when I use them, it detect metadata got null.

Maybe related to auto-reset, but I tried 120 ohm resistor and also 100 uF capacitor, they may make the board not auto-reset, but still can not let ols detect the arduino device.

[tomaskovacik]

ch340 cant make 115200 bps :/

[long0900]

My cheap knock off clone works ?!

[imbuedhope]

Anyone know if SUMP cares about the serial bit rate? It should be a fairly trivial to fix if it does.

[gillham]

I have a couple cheap boards with CH340 to test more. I’m hoping to pick my Arduino stuff up again after moving and a lot of other changes.

[gillham]

I have tested several CH340 based boards. Uno style clones, Nano clones etc. The all generally work at 115200.

@tomaskovacik are you still having problems? Is there a specifc board on eBay or AliExpress that you have tried that doesn't work? Send an item number.

[tomaskovacik]

hello, I do not use your project anymore, so I can tell what board it was which did not work for me