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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, def __init__(self, trigger_pin: int, echo_pin: int, measurement_interval: float = 0.1,
timeout: float = 1.0, warmup_time: float = 2.0, *args, **kwargs): 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 :param trigger_pin: GPIO PIN where you connected your sensor trigger PIN (the one that triggers the
sensor to perform a measurement). 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 :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). 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 :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). received after this time (default: 1 second).
@ -45,6 +48,7 @@ class GpioSensorDistancePlugin(GpioPlugin, GpioSensorPlugin):
self.trigger_pin = trigger_pin self.trigger_pin = trigger_pin
self.echo_pin = echo_pin self.echo_pin = echo_pin
self.measurement_interval = measurement_interval
self.timeout = timeout self.timeout = timeout
self.warmup_time = warmup_time self.warmup_time = warmup_time
self._measurement_thread: Optional[threading.Thread] = None self._measurement_thread: Optional[threading.Thread] = None
@ -135,12 +139,15 @@ class GpioSensorDistancePlugin(GpioPlugin, GpioSensorPlugin):
def _get_measurement_thread(self, duration: float): def _get_measurement_thread(self, duration: float):
def _thread(): def _thread():
with self: with self:
self.logger.info('Started distance measurement thread')
start_time = time.time() start_time = time.time()
try: try:
while self._measurement_thread_can_run and ( while self._measurement_thread_can_run and (
not duration or time.time() - start_time <= duration): not duration or time.time() - start_time <= duration):
self.get_measurement() self.get_measurement()
if self.measurement_interval:
time.sleep(self.measurement_interval)
finally: finally:
self._measurement_thread = None self._measurement_thread = None