test mcp23017 - 9 of the 16 pins

mcp23017.py

#!/usr/bin/python3
import pprint
import board
import busio
from digitalio import Direction
from time import sleep

from adafruit_mcp230xx.mcp23017 import MCP23017
i2c = busio.I2C(board.SCL, board.SDA)

pp = pprint.PrettyPrinter(indent=4)

mcp = MCP23017(i2c)

pins = {}
for x in range(0,8):
    pins[x]=mcp.get_pin(x)
    pins[x].direction = Direction.OUTPUT

for x in range(0,8):
    pins[x].value = True
    print(x, pins[x].value)
    sleep(.1)

for x in range(0,8):
    pins[x].value = False
    print(x, pins[x].value)
    sleep(.1)

for x in range(0,99):
    for x in range(0,8):
        pins[x].value = True
        print(x, pins[x].value)
    sleep(.4)
    for x in range(0,8):
        pins[x].value = False
        print(x, pins[x].value)
    sleep(2)

sleep(1)

# the old twinkle loop
'''
while True:
    for x in range(0,8):
        pins[x].value = True
        print(x, pins[x].value)
        sleep(.1)
        pins[x].value = False
        sleep(.1)
'''

# pp.pprint(pins)