Python code for digital inputs

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Code:

import smbus2
import time

# I2C device address
I2C_ADDR = 0x20

# MCP23017 register addresses
IODIRA = 0x00  # Port A direction register (1 = input, 0 = output)
IODIRB = 0x01  # Port B direction register
IPOLA = 0x02   # Port A polarity inversion register
IPOLB = 0x03   # Port B polarity inversion register
GPIOA = 0x12   # Port A data register
GPIOB = 0x13   # Port B data register

# Initialize I2C bus
bus = smbus2.SMBus(1)  # Raspberry Pi default I2C-1

# Configure MCP23017 as input and enable polarity inversion
bus.write_byte_data(I2C_ADDR, IODIRA, 0xFF)  # Set all Port A pins as input
bus.write_byte_data(I2C_ADDR, IODIRB, 0xFF)  # Set all Port B pins as input
bus.write_byte_data(I2C_ADDR, IPOLA, 0xFF)  # Invert polarity for Port A (1->0, 0->1)
bus.write_byte_data(I2C_ADDR, IPOLB, 0xFF)  # Invert polarity for Port B

# Define pin names
pins = [
    "Button_1", "Button_2", "Button_3", "Button_4",
    "Button_5", "Button_6", "Button_7", "Button_8",
    "Button_9", "Button_10", "Button_11", "Button_12",
    "Button_13", "Button_14", "Button_15", "Button_16"
]

def read_inputs():
    """Read GPIOA and GPIOB from MCP23017 and parse button states"""
    gpio_a = bus.read_byte_data(I2C_ADDR, GPIOA)  # Read Port A
    gpio_b = bus.read_byte_data(I2C_ADDR, GPIOB)  # Read Port B
   
    # Parse button states
    states = [(gpio_a >> i) & 1 for i in range(8)] + [(gpio_b >> i) & 1 for i in range(8)]
   
    return {pins[i]: states[i] for i in range(16)}

# Main loop: Read and display button states
try:
    while True:
        button_states = read_inputs()
        print("Button States:", button_states)
        time.sleep(0.5)
except KeyboardInterrupt:
    print("\nProgram terminated")
    bus.close()