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41 lines
972 B
41 lines
972 B
3 weeks ago
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from machine import Pin
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SENSOR_READ_PERIOD = const(1)
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import onewire, ds18x20, time
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class Sensor:
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last_read_time: int
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last_result: int
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sensor: ds18x20.DS18X20
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rom: Any
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def __init__(self, sensor_data_pin: Pin) -> None:
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self.last_read_time = time.time()
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self.last_result = 28
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self.sensor = ds18x20.DS18X20(onewire.OneWire(sensor_data_pin))
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roms = self.sensor.scan()
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assert len(roms) == 1, "Not (only) one sensor on the bus"
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self.rom = roms[0]
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def __should_read_data(self) -> bool:
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return (time.time() - self.last_read_time) > SENSOR_READ_PERIOD
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def read(self) -> int:
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if not self.__should_read_data():
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return self.last_result
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sensor = self.sensor
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try:
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sensor.convert_temp()
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result = sensor.read_temp(self.rom)
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self.last_result = result
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self.last_read_time = time.time()
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except OSError as e:
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print("err reading sensor", e)
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return self.last_result
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return result
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