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Sleep for (default: 0.1 seconds) between reads when distance sensor runs in 

continuous mode to prevent excessive CPU load
This commit is contained in:
Fabio Manganiello 2019-12-22 19:56:43 +01:00
parent 17d233b55d
commit b36a8095ab
1 changed files with 9 additions and 2 deletions
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11
platypush/plugins/gpio/sensor/distance/__init__.py
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@ -25,8 +25,8 @@ class GpioSensorDistancePlugin(GpioPlugin, GpioSensorPlugin):
"""
def __init__(self, trigger_pin: int, echo_pin: int,
timeout: float = 1.0, warmup_time: float = 2.0, *args, **kwargs):
def __init__(self, trigger_pin: int, echo_pin: int, measurement_interval: float = 0.1,
timeout: float = 2.0, warmup_time: float = 2.0, *args, **kwargs):
"""
:param trigger_pin: GPIO PIN where you connected your sensor trigger PIN (the one that triggers the
sensor to perform a measurement).
@ -34,6 +34,9 @@ class GpioSensorDistancePlugin(GpioPlugin, GpioSensorPlugin):
:param echo_pin: GPIO PIN where you connected your sensor echo PIN (the one that will listen for the
signal to bounce back and therefore trigger the distance calculation).
:param measurement_interval: When running in continuous mode (see
:func:`platypush.plugins.gpio.sensor.distance.GpioSensorDistancePlugin.start_measurement`) this parameter
indicates how long should be waited between two measurements (default: 0.1 seconds)
:param timeout: The echo-wait will terminate and the plugin will return null if no echo has been
received after this time (default: 1 second).
@ -45,6 +48,7 @@ class GpioSensorDistancePlugin(GpioPlugin, GpioSensorPlugin):
self.trigger_pin = trigger_pin
self.echo_pin = echo_pin
self.measurement_interval = measurement_interval
self.timeout = timeout
self.warmup_time = warmup_time
self._measurement_thread: Optional[threading.Thread] = None
@ -135,12 +139,15 @@ class GpioSensorDistancePlugin(GpioPlugin, GpioSensorPlugin):
def _get_measurement_thread(self, duration: float):
def _thread():
with self:
self.logger.info('Started distance measurement thread')
start_time = time.time()
try:
while self._measurement_thread_can_run and (
not duration or time.time() - start_time <= duration):
self.get_measurement()
if self.measurement_interval:
time.sleep(self.measurement_interval)
finally:
self._measurement_thread = None