A class that simplifies controlling CD4094 CMOS 8-bit latched shift registers from a Raspberry Pi
$ sudo apt-get update; sudo apt-get install git python3-pip python3-pigpio pigpiod$ git clone https://github.com/phillipdavidstearns/rpi-cd4094.git$ cd rpi-cd4094$ sudo python3 -m pip install -e ./
#-----------------------------------------------------------------
# import the CD4094 class
from CD4094 import CD4094
#-----------------------------------------------------------------
# Quick initialization
# start new controller for CD4094
# defaults to a single chip w/ 8 output channels
# uses default pins for controlling the chip
controller = CD4094()
#-----------------------------------------------------------------
#Detailed initialization
# setup pins using BCM GPIO pin numbers (values below are default)
STROBE = 17 # latch strobe GPIO pin
DATA = 27 # data GPIO pin
CLOCK = 22 # clock GPIO pin
ENABLE = 23 # enable GPIO pin
#specify number of channels in the shift register chain (default 8)
channels = 8 #
#bundle pins
pins = [STROBE, DATA, CLOCK, ENABLE]
#initializes a new controller for CD4094
controller = CD4094(pins=pins, channels=channels)
# toggle output
controller.enable()
controller.disable()
# flush register
controller.reset()
# pre-exit cleanup. use before terminating parent application to flush output
controller.stop()
# load data into register
pin_states = [ 1, 0, 1, 0, 1, 0, 1, 0 ] #list of int values 0-1
data = 0
for i in range(len(pin_states)):
data |= pin_states[i] << i
controller.update(data)