ttyUSB0 - ttyUSB1 Homeduino and My Sensors

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What am I doing wrong

When I use Pimatic with Homeduino everything works fine, but…
Now I made a My Sensors controller but then my Homeduino doesn’t work anymore
When I want to switch a homeplug I get “[pimatic]: operation timed out”

I made a makefile to change the port for homeduino to USB0 (and also USB1…)
When I use the command: dmesg | grep tty
This is the output:
[ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 b
cm2708_fb.fbheight=416 bcm2708.boardrev=0xe bcm2708.serial=0x7ef70778 smsc95xx.m
acaddr=B8:27:EB:F7:07:78 bcm2708_fb.fbswap=1 sdhci-bcm2708.emmc_clock_freq=25000
0000 vc_mem.mem_base=0x1ec00000 vc_mem.mem_size=0x20000000 dwc_otg.lpm_enable=0
console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevato
r=deadline rootwait
[ 0.001414] console [tty1] enabled
[ 0.646226] dev:f1: ttyAMA0 at MMIO 0x20201000 (irq = 83, base_baud = 0) is a
PL011 rev3
[ 1.027734] console [ttyAMA0] enabled
[ 6.813538] usb 1-1.2: ch341-uart converter now attached to ttyUSB0
[ 7.166364] usb 1-1.3: FTDI USB Serial Device converter now attached to ttyUS
B1

Does anybody has an idea ?

@bolliebol, maybe you have problems that port ttyUSB0 and ttyUSB1 are not persistent. They can change when rebooting or plugin devices in USB ports.
To circumvent this I use /dev/serial/by-path/ (using two nano with same device-id and serial) or /dev/serial/by-id (using two nanos with different device-id or serial) instead of ttyUSBx. They are persistent,

@edautz said:

@bolliebol, maybe you have problems that port ttyUSB0 and ttyUSB1 are not persistent. They can change when rebooting or plugin devices in USB ports.
To circumvent this I use /dev/serial/by-path/ (using two nano with same device-id and serial) or /dev/serial/by-id (using two nanos with different device-id or serial) instead of ttyUSBx. They are persistent,

Hi Im having the same issue. as soon i reboot my systeem it swaps the usb ports randomly. I have 2 devices connected. How can i fix this so that the arduino will be on port 0 and the opentherm gateway on port1?

check this out, should help
http://forum.pimatic.org/topic/42/tip-homeduino-usb

After connecting the devices, you can see what device information is put in the /dev/serial/by-path/ directory. Use this complete path information instead of the ttyUSBx in the configuration. Be aware to use the same USB port each time. If you connect devices with different id’s or serials, you can use /dev/serial/by-id. In this case the USB port doesn’t matter.

I had the same issue with two devices. i used this tut to get it fixed. instead of ttyusb0 or 1 simply use the name defined in the file.

http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/

Thanks @edautz ,

This is the answer :
http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/

It’s working

Also in topic #42.

Unfortunately some cheap devices don’t have different serial ids. So the only way I found is to use always the same port for a certain device. I use

udevadm info -a -n /dev/ttyUSB1 | grep '{devpath}' | head -n1

and get e.g.

ATTRS{devpath}=="1.3"

I then use this information in udev rules to get symbolic names for my devices.

Hey Heinzelmann,

Thanks for this tip! This works

udevadm info -a -n /dev/ttyUSB1 | grep ‘{devpath}’ | head -n1
and get e.g.

ATTRS{devpath}==“1.3”

in combination with:

http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/

Perfekt!

I’m pleased!