3x4 Matrix Keypad
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Punch in your secret key (or Jenny's number ) into this numeric matrix keypad. This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. The keys are connected into a matrix, so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad. Check the tutorials tab for links to an Arduino library and example code.
We include some headers so you can plug this into a breadboard with ease, some light soldering is required to attach it. Or you can use plain wires if you like. It's basically a sturdier version of our Membrane 3x4 Matrix Keypad . Note that the rows and columns are intermixed. The order from left to right is COL2, ROW1, COL1, ROW4, COL3, ROW3, ROW2.
We also have a 4x4 version of this matrix keypad and a version that has phone-styling with letters printed over the numbers
If you dig our demo, check out the Adafruit FeatherWing OLED - 128x32 OLED