#!/usr/bin/env python3 # demo will drive multiple MCP23017 devices at different addresses # see http://quick2wire.com/2012/12/see-the-new-boards-at-work-with-blinken-bars/ for demo from time import sleep from itertools import cycle import sys import quick2wire.i2c as i2c from quick2wire.parts.mcp23017 import Registers as MCP23017Registers from quick2wire.parts.mcp23x17 import IODIRB, GPIO offset = int(sys.argv[1]) if len(sys.argv) > 1 else 0 address = 0x20 + offset with i2c.I2CMaster() as bus: chip = MCP23017Registers(bus, address) chip.reset() chip.write_register(IODIRB, 0x00) try: for count in cycle(range(256)): chip.write_banked_register(1, GPIO, count) sleep(0.1) finally: chip.reset()