If you enjoy building electronic circuits, projects and devices, you might be interested in a new component launched by Adafruit this week in the form of the new Adafruit 4×4 elastomer keypad.
The Adafruit 4×4 elastomer keypad combines with the Adafruit Trellis Monochrome Driver PCB which is also new, to provide users with an open source backlight keypad driver system. Which is easy to setup and works with 3mm LEDs.
Adafruit explains a little more: “This PCB is specially made to match the Adafruit 4×4 elastomer keypad. Each Trellis PCB has 4×4 pads and 4×4 matching spots for 3mm LEDs. The circuitry on-board handles the background key-presses and LED lighting for the 4×4 tile. However, it does not have any microcontroller or other ‘brains’ – an Arduino (or similar microcontroller) is required to control the Trellis to read the keypress data and let it know when to light up LEDs as desired.
Each tile has an I2C-controlled LED sequencer and keypad reader already on it. The chip can control all 16 LEDs individually, turning them on or off. It cannot do grayscale or dimming. The same chip also reads any keypresses made with the rubber keypad. The connections are ‘diode multiplexed’ so you do not have to worry about “ghosting” when pressing multiple keys, each key is uniquely addressed.”
For more information on the new Adafruit Trellis Monochrome Driver PCB and Adafruit 4×4 elastomer keypad jump over to the Adafruit website for details.