GPIO Zero also provides several “internal” devices which represent facilities provided by the operating system itself. These can be used to react to things like the time of day, or whether a server is available on the network.
Warning
These devices are experimental and their API is not yet considered stable. We welcome any comments from testers, especially regarding new “internal devices” that you’d find useful!
Extends InternalDevice to provide a device which is active when the computer’s clock indicates that the current time is between start_time and end_time (inclusive) which are time instances.
The following example turns on a lamp attached to an Energenie plug between 7 and 8 AM:
from gpiozero import TimeOfDay, Energenie
from datetime import time
from signal import pause
lamp = Energenie(0)
morning = TimeOfDay(time(7), time(8))
lamp.source = morning.values
pause()
Parameters: |
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Extends InternalDevice to provide a device which is active when a host on the network can be pinged.
The following example lights an LED while a server is reachable (note the use of source_delay to ensure the server is not flooded with pings):
from gpiozero import PingServer, LED
from signal import pause
google = PingServer('google.com')
led = LED(4)
led.source_delay = 60 # check once per minute
led.source = google.values
pause()
Parameters: | host (str) – The hostname or IP address to attempt to ping. |
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Extends InternalDevice to provide a device which is active when the CPU temperature exceeds the threshold value.
The following example plots the CPU’s temperature on an LED bar graph:
from gpiozero import LEDBarGraph, CPUTemperature
from signal import pause
# Use minimums and maximums that are closer to "normal" usage so the
# bar graph is a bit more "lively"
cpu = CPUTemperature(min_temp=50, max_temp=90)
print('Initial temperature: {}C'.format(cpu.temperature))
graph = LEDBarGraph(5, 6, 13, 19, 25, pwm=True)
graph.source = cpu.values
pause()
Parameters: |
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Returns the current CPU temperature in degrees celsius.
Returns True when the CPU temperature exceeds the threshold.
The classes in the sections above are derived from a series of base classes, some of which are effectively abstract. The classes form the (partial) hierarchy displayed in the graph below (abstract classes are shaded lighter than concrete classes):
The following sections document these base classes for advanced users that wish to construct classes for their own devices.