def __init__(self, spi, latch, columns, lines, backlight_inverted=False):
# pylint: disable=too-many-arguments
"""Initialize character LCD connected to backpack using SPI connection
on the specified SPI bus and latch line with the specified number of
columns and lines on the display. Optionally specify if backlight is
inverted.
"""
# pylint: enable=too-many-arguments
import adafruit_74hc595
self._shift_register = adafruit_74hc595.ShiftRegister74HC595(
spi, latch)
reset = self._shift_register.get_pin(1)
enable = self._shift_register.get_pin(2)
db4 = self._shift_register.get_pin(6)
db5 = self._shift_register.get_pin(5)
db6 = self._shift_register.get_pin(4)
db7 = self._shift_register.get_pin(3)
backlight_pin = self._shift_register.get_pin(7)
super().__init__(reset,
enable,
db4,
db5,
db6,
db7,
columns,
lines,
backlight_pin=backlight_pin,
backlight_inverted=backlight_inverted)
import time
import board
import digitalio
import adafruit_74hc595
latch_pin = digitalio.DigitalInOut(board.D5)
sr = adafruit_74hc595.ShiftRegister74HC595(board.SPI(), latch_pin)
# Create the pin objects in a list
pins = [sr.get_pin(n) for n in range(8)]
while True:
for _ in range(2): # Run the chase animation twice
for enabled_pin in range(len(pins)):
for pin_number, pin in enumerate(pins):
if pin_number == enabled_pin:
pin.value = True
else:
pin.value = False
time.sleep(0.01)
for _ in range(3): # Run the blink animation three times
for pin in pins:
pin.value = True
time.sleep(0.5)
for pin in pins:
pin.value = False
time.sleep(0.5)
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
import time
import board
import busio
import digitalio
import adafruit_74hc595
spi = busio.SPI(board.SCK, MOSI=board.MOSI)
latch_pin = digitalio.DigitalInOut(board.D5)
sr = adafruit_74hc595.ShiftRegister74HC595(spi, latch_pin)
pin1 = sr.get_pin(1)
while True:
pin1.value = True
time.sleep(1)
pin1.value = False
time.sleep(1)
