Automatic Backlight control

Automatic Backlight Control

The picture to the right shows a theoretical circuit to turn
on and off the Backlight when the LCD's LED is turned
on and off.

Parts can be gotten from the links below

Opto http://sales.goldmine-elec.com/prodinfo.asp?prodid=7112\

Relay http://sales.goldmine-elec.com/prodinfo.asp?prodid=6831

Sending a code 0x5C 0x4A 0x00 0x01 To turn it on
Sending a code 0x5C 0x4A 0x00 0x00 To turn it off

More information can be gotten from http://www.pjrc.com/tech/mp3/lcd_protocol.html