This new Adafruit shield makes it easy to use a 16x2 Character LCD. The 16x2 Character LCD is NOT, repeat, NOT, included
We really like the range of LCDs we stock in the shop, such as our classic blue & white
as well as the fancy RGB negative
and RGB positive
Unfortunately, these LCDs do require quite a few digital pins, 6 to
control the LCD and then perhaps another 3 to control the RGB backlight
for a total of 9 pins. That's half of the pins available on a classic
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
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 will also work perfectly with Arduino
Mega R3's. 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 shield comes as a kit! Included is a high quality, USA-made PCB and all the components (buttons, header etc). An LCD is not included, you will need to order one of our fine 16x2 Character LCDs
- just pick up whichever style you like the most (blue & white
, RGB negative
or RGB positive
This kit has only been tested with the LCDs we sell and support, if you
use another we will not be able to guarantee it works and we will not be
able to troubleshot or support it!
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
If you don't already have an LCD we suggest picking up a 'pack' which includes the LCD and will save you a bundle: RGB Positive Pack
, RGB Negative Pack
and Basic Blue&White Pack
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.
At this time, the library and shield can control the RGB backlight of
our character LCDs by turning each LED on or off. This means you can
display the following colors: Red, Yellow, Green, Teal, Blue, Violet,
White and all 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 RGB
backlight to display a larger range of colors, this shield can't do that
(the I2C expander does not have PWM output).