Product Details:
This Arduino®-compatible shield from Adafruit makes it easy to attach a 16x2 LCD display to your project. Control the 3 backlight pins and 5 pincs from the built-in keypad with only 2 I2C pins!
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' Arduino®s 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 shield will not fit easily on top of an Arduino® Ethernet because of the Ethernet jack height.
At this time, the library and shield can control the RGB backlight of the 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).
Specifications:
• Dimensions: 2.1" x 3.2"
• Comes with a 16x2 RGB backlight LCD, negative display
• Plug and play with any Arduino® 'classic' - UNO, duemilanove, diecimilla, etc as well as Arduino® Mega R3.
• Uses only the I2C pins - Analog 4 & 5 on classic Arduino®s, Digital 20 and 21 on Arduino® Mega R3
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