4x4 Matrix 16 Key Membrane Switch Keypad Keyboard for Arduino/AVR/PIC/ARM New

4x4 Matrix 16 Key Membrane Switch Keypad Keyboard for Arduino/AVR/PIC/ARM New

 

4x4 Matrix 16 Key Membrane Switch Keypad Keyboard for Arduino/AVR/PIC/ARM New

Using 3x4 matrix keypad with the Raspberry Pi 
Written by Chris Crumpacker
Another module of my alarm interface is done. I picked up a 3x4 matrix keypad but couldn't find any good python code examples for it's use. I was able to find a few examples that lead me down the right path in terms of scanning rows first as inputs and then swaping pins to scan the columns. I wrote two libraries, the first just uses 7 of the Raspberry Pi's GPIO pins then I also wrote one that works for the MCP23008 chip since I'm really in a mode of saving pins when I can :) Then also just wrote a demo script to show calling the libraries and their useHere is the code as it stands now, I have some ideas on how to change it to be better but this is fully working for now.

Python Code for 3×4 Matrix Keypad with Raspberry Pi #piday #raspberrypi @Raspberry_Pi
Also see -  WiringPI
 

 
 
Features:
  • Brand new and high quality
  • Max circuit rating: DC 35V, 100mA
  • Insulation resistance: 100M Ohm, 100V
  • Dielectric withstand: 250VRms (50-60Hz, 1 min)
  • Contact bounce: <=5ms
  • Life expectancy: 1 million closures
  • Operating temperature: -40 ~ +80°C
  • Operating humidity: 40°C, 90% ~ 95%
  • Connector type: 8 pin
  • Mount type: self-adhesive
  • Total length: 160 mm
  • Cable length (inc connector):88mm
  • Size: 70 x 77 x 1mm


Package Included:

1 X Matrix 16 Key Membrane 

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  • Views: 9914
  • Product Code: 4x4 Matrix 16 Key Membrane Switch Keypad Keyboard
  • Availability: In Stock
  • AUD $9.95

Tags: 4x4 Matrix, 16 Key, Membrane, Switch, Keypad, Keyboard