Matrix Keypad
Project description
Introduction
Python Library for Matrix Keypads. Written and tested on a Model B Raspberry Pi. Supports both a 3x4 and 4x4 keypad included
Version
- v0.1:
May 2013
Initial Scripts
- v1.0:
August 2013
Initial package build
Prerequisites
If the I2C Port expander MCP23017 or MCP23008 is being used, the Adafruit Python library for I2C and the MCP will need to be installed.
- You can clone the whole library like so,
git clone https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code.git
or the two files needed can be pulled out, Adafruit_I2C.py & Adafruit_MCP230xx.py.
Install
Files Included
README.txt LICENSE.txt setup.py matrix_keypad/ __init__.py matrix_keypad_RPi_GPIO.py matrix_keypad_MCP230xx.py matrix_keypad_demo.py matrix_keypad_demo2.py
Usage
See the demo scripts included to see this all in action.
To call the library select which one you intend to use and use the correct line:
>> from matrixKeypad_MCP230xx import keypad
or:
>> from matrixKeypad_RPi_GPIO import keypad
Then name the library so it is easier to reference later:
>> kp = keypad()
It is possible to just check to see if a digit is currently pressed.:
>> checkKeypad = kp.getKey()
Or a simple function to call the keypad library and loop through it waiting for a digit press
def digit(): # Loop while waiting for a keypress digitPressed = None while digitPressed == None: digitPressed = kp.getKey() return digitPressed
References
Column and Row scanning adapted from Bandono’s matrixQPI which is wiringPi based.
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