On Monday 12 April 2021 05:29:42 Christian Seiler wrote: > Hi there, > > Am 2021-04-12 05:55, schrieb Gene Heskett: > > Building a design/builder for a 3d printer, which when a std usb to > > printer cable is connected between the computer and the 3d printer, > > Identifies as a ch341 convertor cable once it is plugged into the > > printer. > > > > [...] > > > > What would the next thing to try and discover why its not working? > > Do you actually have permissions for the device? Typically serial > devices have permissions such that only root and the group 'dialout' > can access them. You can check that via: > > ls -l /dev/ttyUSB0 > > That will typically look something like > > crw-rw---- 1 root dialout 4, 64 Apr 12 08:54 /dev/ttyUSB0 > > You can use id to determine if you are in the 'dialout' group. If > that doesn't appear (but your user and other groups do appear), then > you may add your user to that group via > > gpasswd -a USERNAME dialout > > (Replace USERNAME by your username, run this command as root.) > > (Note that I've used ttyUSB0 here, because CH341 devices typically > appear as such, but other USB to serial converters may also appear > as ttyACM0 instead of ttyUSB0.) > > Additionally, even if the permissions are OK, if you have ModemManager > installed (which is typically the case on desktop systems), for the > first 30 to 60 seconds it will try to detect if the device in question > is a model, and only once that fails will it release the device. So it > could be that the device is "stolen" by ModemManager directly after > pluggin it in and/or powering it up, and you have to wait a bit until > ModemManager releases it. > > Furthermore, if you have software installed that is used for devices > that help people with vision impairments, it could be that that > interferes with USB serial devices, as some such devices also use a > USB serial interface. > > You can check if another software (ModemManager, or something else) is > currently using the serial device by calling: > > lsof /dev/ttyUSB0 > > (Run the command as root.) > > Hope that helps!
Maybe. Since I am a C.E.T., I took the bottom off, finding an apparently well regarded 32 bit board by Makerbase, a Robin MKS Nano V1.2 Carefull inspection seems to indicate a lot of heat telegraphed out of one of the 4 pwr transistors adjacent to where the bed heater wires are attached. And since it heats the bed first, nothing else but homing works. Since I've $400 with taxes in this thing, and it has a BIQU H2 printhead, which I can get steel nozzles for, and I just ordered 2 rolls of carbon fiber reenforced PETG for my ender 3 with a fixed microswiss extruder kit with steel nozzles, I have ordered the whole kit, touch display and interconnect cable and everything to replace it with. Around $75. Maybe I can salvage it yet. But it will be the middle of May arriving. Same as the H2 I have coming for the ender 3. The ender 3 can be picky, but I have the dregs of the 6th roll of PETG on its peg right now. Considering PETG is the topend of its temps range, surviving for 6 rolls is great. Thanks Christian, stay well now. > Regards, > Christian Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>
