Punch in your secret key (or Jenny’s number) into these numeric matrix keypads. We got ‘em in two “flavors”!
First up, the 3×4!
This keypad has 12 buttons, arranged in a telephone-line 3×4 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 header 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.
There’s a great Matrix Keypad Arduino library that should work great with this item with minor adjustments. It’s basically a sturdier version of our Membrane 3×4 Matrix Keypad. Note that the rows and columns are intermixed. The order from left to right is COL2, ROW1, COL1, ROW4, COL3, ROW2, ROW1
This keypad has 16 buttons, arranged in a telephone-line 4×4 grid. The keys are connected into a matrix, so you only need 8 microcontroller pins (4-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 header 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.
There’s a great Matrix Keypad Arduino library that should work great with this item with minor adjustments. It’s basically a sturdier version of our Membrane 3×4 Matrix Keypad. Starting from the left there are four row pins, and then to the right are the four column pins.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
Python for Microcontrollers — Python on Microcontrollers Newsletter: Summer of Making, CircuitPython Day Announced and more! #Python #Adafruit #CircuitPython @circuitpython @micropython @ThePSF
Adafruit IoT Monthly — Repurposed Smart Home Displays, Open-Source 5G Networks, and more!
