LED-INTERFACE

import sys sys.path.append('/home/pi/Adafruit-Raspberry-Pi-Python-Code�legacy/Adafruit_CircuitPython_MCP230xx-main') # LIBRARY import time import board import busio from digitalio import Direction, Pull from adafruit_mcp230xx.mcp23017 import MCP23017

Initialize the I2C bus:

i2c = busio.I2C(board.SCL, board.SDA)

Initialize the MCP23017 chip on the bonnet

mcp = MCP23017(i2c)

Optionally change the address of the device if you set any of the A0, A1, A2

pins. Specify the new address with a keyword parameter:

mcp = MCP23017(i2c, address=0x20) # MCP23017

Make a list of all the port A pins (Refer User Manual page no 14)

PortA = [ ] for pin in range(0, 8): PortA.append(mcp.get_pin(pin))

Make a list of all the port B pins (Refer User Manual page no 14)

PortB = [ ] for pin in range(8, 16): PortB.append(mcp.get_pin(pin)) for pin in range(0,8): # CLEARING ALL THE PORT A PINS PortA[pin].value=False for pin in range(0,8): # CLEARING ALL PORT B PINS PortB[pin].value=False PortA[0].direction = Direction.OUTPUT PortA[1].direction = Direction.OUTPUT PortA[2].direction = Direction.OUTPUT PortA[3].direction = Direction.OUTPUT PortA[4].direction = Direction.OUTPUT PortA[5].direction = Direction.OUTPUT PortA[6].direction = Direction.OUTPUT PortA[7].direction = Direction.OUTPUT PortB[0].direction = Direction.OUTPUT try: while True: print("RED LED ON") PortA[0].value = True PortA[3].value = True PortA[6].value = True time.sleep(2) print("GREEN LED ON") PortA[1].value = True PortA[4].value = True PortA[7].value = True time.sleep(2) print("BLUE LED ON") PortA[2].value = True PortA[5].value = True PortB[0].value = True time.sleep(2) print("RED LED OFF") PortA[0].value = False PortA[3].value = False PortA[6].value = False time.sleep(2) print("GREEN LED OFF") PortA[1].value = False PortA[4].value = False PortA[7].value = False time.sleep(2) print("BLUE LED OFF") PortA[2].value = False PortA[5].value = False PortB[0].value = False time.sleep(2) except KeyboardInterrupt: # CLEAR ALL PORT PINS Press CTRL+C for pin in range(0,8): PortA[pin].value=False for pin in range(0,8): PortB[pin].value=False