We will create a new PushButton class to represent a pushbutton connected to our board that can use either a pull-up or a pull-down resistor. The following lines show the code for the new PushButton class that works with the mraa library. The code file for the sample is iot_python_chapter_05_01.py.
import mraa
import time
from datetime import date
class PushButton:
def __init__(self, pin, pull_up=True):
self.pin = pin
self.pull_up = pull_up
self.gpio = mraa.Gpio(pin)
self.gpio.dir(mraa.DIR_IN)
@property
def is_pressed(self):
push_button_status = self.gpio.read()
if self.pull_up:
# Pull-up resistor connected
return push_button_status == 0
else:
# Pull-down resistor connected
return push_button_status == 1
@property
def is_released(self):
return not self.is_pressedWe have to specify the pin...