# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
# SPDX-FileCopyrightText: Copyright (c) 2022 ladyada for Adafruit Industries
#
# SPDX-License-Identifier: Unlicense

import time

import board

import adafruit_pcf8574

print("PCF8574 8 input button test")

i2c = board.I2C()  # uses board.SCL and board.SDA
# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
pcf = adafruit_pcf8574.PCF8574(i2c)


# turn on all 8 weak pullups
pcf.write_gpio(0xFF)

while True:
    vals = pcf.read_gpio()
    for b in range(8):
        if not vals & (1 << b):
            print(f"button #{b} pressed")
    time.sleep(0.01)  # debounce delay