usb switch の編集

[[知恵袋]]

*** Switch をつないでみる [#b42fea1c]

root@pc0443:/home/sekigawa# tail -f /var/log/syslog
 Aug  4 08:47:03 pc0443 NetworkManager[869]: <info>  [1754264822.9820] dhcp4 (enx8857ee65eb42):   nameserver '192.168.3.1'
 Aug  4 08:47:03 pc0443 NetworkManager[869]: <info>  [1754264822.9821] dhcp4 (enx8857ee65eb42): state changed bound -> bound
 Aug  4 08:47:03 pc0443 systemd[1]: Starting Network Manager Script Dispatcher Service...
 Aug  4 08:47:03 pc0443 systemd[1]: Started Network Manager Script Dispatcher Service.
 Aug  4 08:47:03 pc0443 dhclient[1162]: bound to 192.168.3.108 -- renewal in 36087 seconds.
 Aug  4 09:04:22 pc0443 systemd[1]: Started Run anacron jobs.
 Aug  4 09:04:22 pc0443 anacron[12818]: Anacron 2.3 started on 2025-08-04
 Aug  4 09:04:22 pc0443 anacron[12818]: Normal exit (0 jobs run)
 Aug  4 09:17:02 pc0443 CRON[12833]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
 Aug  4 09:46:55 pc0443 systemd[1]: Started Session 87 of user sekigawa.
 Aug  4 09:48:23 pc0443 kernel: [254282.904905] usb 3-8: new full-speed USB device number 7 using xhci_hcd
 Aug  4 09:48:23 pc0443 kernel: [254283.054214] usb 3-8: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
 Aug  4 09:48:23 pc0443 kernel: [254283.054220] usb 3-8: New USB device strings: Mfr=0, Product=2, SerialNumber=0
 Aug  4 09:48:23 pc0443 kernel: [254283.054224] usb 3-8: Product: USB Serial
 Aug  4 09:48:23 pc0443 mtp-probe: checking bus 3, device 7: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-8"
 Aug  4 09:48:23 pc0443 mtp-probe: bus: 3, device: 7 was not an MTP device
 Aug  4 09:48:24 pc0443 kernel: [254283.150915] usbcore: registered new interface driver usbserial_generic
 Aug  4 09:48:24 pc0443 kernel: [254283.150922] usbserial: USB Serial support registered for generic
 Aug  4 09:48:24 pc0443 kernel: [254283.162031] usbcore: registered new interface driver ch341
 Aug  4 09:48:24 pc0443 kernel: [254283.162055] usbserial: USB Serial support registered for ch341-uart
 Aug  4 09:48:24 pc0443 kernel: [254283.162076] ch341 3-8:1.0: ch341-uart converter detected
 Aug  4 09:48:24 pc0443 kernel: [254283.162451] usb 3-8: ch341-uart converter now attached to ttyUSB0
 Aug  4 09:48:24 pc0443 upowerd[2772]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb3/3-8
 Aug  4 09:48:24 pc0443 snapd[899]: hotplug.go:200: hotplug device add event ignored, enable experimental.hotplug
 Aug  4 09:48:24 pc0443 upowerd[2772]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb3/3-8/3-8:1.0
 Aug  4 09:48:26 pc0443 ModemManager[876]: <info>  Couldn't check support for device '/sys/devices/pci0000:00/0000:00:14.0/usb3/3-8': not supported by any plugin

root@pc0443:/home/sekigawa# ls /dev/ttyUSB*
 /dev/ttyUSB0

*** 制御文 [#d9b9e0c0]

# 扇風機ON
 echo -ne "1" > /dev/ttyUSB0
 
 # 扇風機OFF
 echo -ne "0" > /dev/ttyUSB0

これだと安定しない~
baud rate の設定や改行コードを入れるように変更

fan_on.sh

#!/bin/bash
 stty -F /dev/ttyUSB0 9600 cs8 -cstopb -parenb -icanon -echo
 printf "1\r" > /dev/ttyUSB0

fan_off.sh

#!/bin/bash
 stty -F /dev/ttyUSB0 9600 cs8 -cstopb -parenb -icanon -echo
 printf "0\r" > /dev/ttyUSB0

タイムスタンプを変更しない