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This keyboard has 12 keys arranged according to the matrix of phones on a 3 X 4 grid. It is made with a thin, flexible membrane and with a support stickers on the back, simply remove the protective film to hang it anywhere. The keys are connected by a matrix, so just 7 pins of a microcontroller to use it (3 columns and 4 rows)
A 7 connector pins Male/Male is provided to easily use it on a breadboard.
- Weight: 7.5 grams
- Dimensions: 70mm x 77mm x 1 mm (2.75 "x 3" x 0.035")
- Cable and connector length: 85mm
- Connector: 7 female pins on 2.54 mm pitch
Arduino library: playground.arduino.cc/Code/Keypad