With this in mind, we wanted to make it easier for people to get these LCD into

their projects so we devised a shield that lets you control a 16x2 Character LCD,

up to 3 backlight pins AND 5 keypad pins using only the two I2C pins on the

Arduino! The best part is you don't really lose those two pins either, since you

can stick i2c-based sensors, RTCs, etc and have them share the I2C bus. This is

a super slick way to add a display without all the wiring hassle.

This shield is perfect for when you want to build a stand-alone project with its

own user interface. The 4 directional buttons plus select button allows basic

control without having to attach a bulky computer.

The shield is designed for 'classic' Arduinos such as the Uno, Duemilanove,

Diecimilla, etc. It uses the I2C pins at Analog 4 and Analog 5. It will also work

perfectly with Arduino Mega R3's which have the extra SDA/SCL I2C pins broken

out. Earlier Mega's have the I2C pins in a different location and will require you

to solder two wires from the I2C pins on the shield and plug them into the

different I2C locations at Digital 20 & 21.

This product comes as a kit! Included is a high quality, USA-made PCB and all

the components (buttons, header etc). This product comes with a 16x2 Blue &

White LCD. Assembly is easy, even if you've never soldered before and the kit

can be completed in 30 minutes. Check the product tutorial page for assembly

instructions before purchasing

Of course, we even wrote an easy-to-use Arduino library that you can easily add

to your project. It acts just like the built in LiquidCrystal library, but

automatically uses the shield pins.You can also easily query the 5 keypad

buttons to get input through the library, so you get extra buttons without using

any more pins. The buttons are automatically de-bounced inside the library.

At this time, the library and shield can control the backlight of our character

LCDs by turning the LED on or off. There is no support for PWM control of the

backlight at this time, so if you need to have more granular control of the

backlight, this shield can't do that (the I2C expander does not have PWM

output).