The Aruba AP-105 is an old wifi access point that only supports 2.4GHz and 5GHz wifi 4. But if we get the hardware for free, we do not complain. Certainly not when we can flash them with OpenWRT. This is the procedure I follow for flashing and a basic config of the AP.
Continue reading OpenWRT on Aruba AP-105This central heating monitoring system I am working on is built around an Arduino Uno. I want to hook it up to a Asus WL-500g deluxe router running OpenWRT. I found that this router has an internal header with two serial ports and I was planning to use one of these ports to link to my Arduino.
Pondering how I was going to do the logic level shifting from the 3.3V on the Asus to the 5V on the Arduino, I wondered if it would be easier just hooking up the Arduino via one of the two USB ports on the Asus WL-500g deluxe router. Plugging in the Arduino via USB did not look very promising, a dmesg only showed:
usb 2-1: new full speed USB device using uhci_hcd and address 2
Plugging in the Arduino on my Ubuntu Linux desktop showed that the Arduino is a “USB ACM” device:
[25009.512051] usb 3-3: new full speed USB device using ohci_hcd and address 4 [25009.731110] cdc_acm 3-3:1.0: ttyACM0: USB ACM device
So, I needed some kind of ACM driver for OpenWRT. A quick search revealed that I needed the usb-acm kernel module, so that is what I installed:
root@OpenWrt:~# opkg update root@OpenWrt:~# opkg list | grep -i acm kmod-usb-acm - 2.6.32.16-1 - Kernel support for USB ACM devices (modems/isdn controllers) root@OpenWrt:~# opkg install kmod-usb-acm
Plugging in the Arduino now shows the right logs in dmesg:
usb 2-1: new full speed USB device using uhci_hcd and address 3 usb 2-1: configuration #1 chosen from 1 choice cdc_acm 2-1:1.0: ttyACM0: USB ACM device
So we can now use /dev/ttyACM0 to talk to the Arduino. Ciao, mondo!
root@OpenWrt:~# ls -l /dev/ttyACM0 crw-rw-rw- 1 root root 166, 0 Oct 25 23:36 /dev/ttyACM0