Page 6 of 13
Page 98
from gpiozero import Button
from signal import pause
button = Button(4, bounce_time=0.25)
def pressed():
print(“Button pressed”)
def released():
print(“Button released”)
button.when_pressed = pressed
button.when_released = released
pause()
Page 102
from gpiozero import Button
from gpiozero import LED
from time import sleep
button = Button(4)
led1 = LED(17, initial_value=True)
led2 = LED(27)
led3 = LED(22)
state = 0
buttonState = button.value
while True:
buttonNow = button.value
buttonDelta = buttonNow-buttonState
buttonState = buttonNow
if state == 0:
if buttonDelta == 1:
state = 1
led1.off()
led2.on()
led3.off()
continue
if state == 1:
if buttonDelta == 1:
state = 2
led1.off()
led2.on()
led3.off()
continue
if state == 2:
if buttonDelta == 1:
state = 0
led1.on()
led2.off()
led3.off()
continue
sleep(0.1)
Page 103
from gpiozero import Button
from time import perf_counter_ns
button = Button(4)
while True:
button.wait_for_press()
button.wait_for_release()
t1 = perf_counter_ns()
button.wait_for_press()
t2 = perf_counter_ns()
print((t2-t1)/1000000)
Page 104
from gpiozero import Button
from time import perf_counter_ns
button = Button(4)
while True:
while not button.value:
pass
while button.value:
pass
t1 = perf_counter_ns()
while not button.value:
pass
t2 = perf_counter_ns()
print((t2-t1)/1000000)
Page 104
from gpiozero import DigitalInputDevice
from time import perf_counter_ns
pulse = DigitalInputDevice(4)
while True:
while not pulse.value:
pass
while pulse.value:
pass
t1 = perf_counter_ns()
while not pulse.value:
pass
t2 = perf_counter_ns()
print((t2-t1)/1000000)
Page 105
from gpiozero import Device
from time import perf_counter_ns
Device()
pulse = Device.pin_factory.pin(4)
pulse.input_with_pull("up")
while True:
while not pulse.state:
pass
while pulse.state:
pass
t1 = perf_counter_ns()
while not pulse.state:
pass
t2 = perf_counter_ns()
print((t2-t1)/1000000)
Page 105
from gpiozero import DigitalInputDevice
class Door(DigitalInputDevice):
def __init__(self, pin=None, pull_up=True, active_state=None,
bounce_time=None, pin_factory=None):
super(Door, self).__init__(
pin, pull_up=pull_up, active_state=active_state,
bounce_time=bounce_time, pin_factory=pin_factory)
@property
def value(self):
return super(Door, self).value
Door.is_closed = Door.is_active
Door.when_open = Door.when_deactivated
Door.when_closed = Door.when_activated
Door.wait_for_open = Door.wait_for_inactive
Door.wait_for_close = Door.wait_for_active
