UDOO and an Arduino LCD

I have continued to want more out of my UDOO, so I decided to make use of a cracked LCD I had sitting around from Adafruit, by having the UDOO display system information to it. A side note: the linux distro I’m using is Ubuntu 12.04 LTS for ARM, and by a cracked LCD I mean the digitizer doesn’t work. You can modify this code to use the touchscreen functionality of the screen if you wish.

Here’s the parts list:

This TFT LCD. It’s worth noting they’ve made a newer revision, but it shouldn’t be any different.
A 10k Ohm resistor
A Jumper kit and board or an arduino shield
A breadboard button

Here’s a short version of the steps:

Wire up the button exactly the same as the arduino tutorial to digital 2.
Modify your LCD to use Digital 3 to control the backlight.

Set up the ttymxc3 device in linux for Serial on 9600 baud

 sudo stty -F /dev/ttymxc3 cs8 9600 ignbrk -brkint -icrnl -imaxbel \
 -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts

Add that command to /etc/rc.local to make it permanent.

Add this bash script to /usr/local/bin
- Set it for startup by adding sh /usr/local/bin/udoo.sh | cat > /dev/ttymxc3 to /etc/rc.local
- Add a cron to update it every minute by adding this to /etc/crontab
```
  * * * * * root sh /usr/local/bin/udoo.sh | cat > /dev/ttymxc3
```
Load this sketch to your Arduino.
Reboot the arduino via the RST switch, or by a full power reboot, ensuring you replace the J18 jumper so that the chips can communicate.