Connecting Arduino to WL-520GU via Serial Port

I successfully got my 3.3 volt arduino built on a breadboard to communicate via serial port with my ASUS WL-520gu Wireless Router.

In broad strokes I did:

• Installed OpenWRT on my ASUS WL-520gu Wireless Router with support for stty built in (used later to change the serial ports speed to something my boarduino could reliably read)
• Built a barebones arduino on a breadboard.  I am running mine at 3.3v to save power, which is also what the serial port on the ASUS WL-520gu Wireless Router is running at.
• Disabled the serial terminal automatically started on the router using:

root@OpenWrt:~# vi /etc/inittab

#tts/0::askfirst:/bin/ash --login
#ttyS0::askfirst:/bin/ash --login

• Ran the following shell script on the router to write any line received on the router’s serial port containing the string “START” to a temporary file:

stty 9600 < /dev/tts/0  # set serial port to 9600 baud
while true
do
temp=$(grep -m 1 START /dev/tts/0)
temp2=$(date +"%D-%X")
echo $temp$temp2
echo $temp$temp2 >> /tmp/serialdata
echo "wrote to serialdata"
done

• If anyone is interested in more, please post in the comments and I’ll add more details.
• I got the temp=$(grep -m 1 START /dev/tts/0) code from Tim’s blog