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The Adafruit Pi Plate and LCD Raspberry Pi Kit make it super easy to use an RGB 16x2 Character LCD with your Raspberry Pi! This product comes as a kit, including a high quality 16x2 Character RGB negative LCD screen, Pi Plate PCB and all the components required to put it all together (buttons, header etc.). 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 if you have any doubts! We have designed a case for the Adafruit 16x2 LCD kits and Raspberry Pi B+/2/3 here!
These LCDs do require quite a few digital pins, 6 to control the LCD and then another 3 to control the RGB backlight for a total of 9 pins. That's nearly all the GPIO available on a Pi! With this in mind, Adafruit wanted to make it easier for people to get these LCD into their projects so devised a Pi plate (included) 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 Raspberry Pi! 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 Pi plate 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 Pi plate has also been recently updated so that the buttons are on the right hand side – making it more mechanically stable.
The plate is designed for both Revision 1 and Revision 2 Raspberry Pi's. It uses the I2C (SDA/SCL) pins and includes a special extra-tall 26-pin header so the plate sits above the USB and Ethernet jacks.
We also have some handy Python code to help you talk to the LCD and buttons. 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 code and plate 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 plate can't do that (the I2C expander does not have PWM output).