75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
import machine
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import onewire
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import ds18x20
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import time
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class TemperatureSensor:
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def __init__(self, pin=10):
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"""Initialize DS18X20 temperature sensor on the specified pin."""
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self.ds_pin = machine.Pin(pin)
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self.ds_sensor = ds18x20.DS18X20(onewire.OneWire(self.ds_pin))
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self.roms = []
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self.scan_sensors()
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def scan_sensors(self):
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"""Scan for connected DS18X20 sensors."""
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try:
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# Convert bytearray to bytes so they can be used as dict keys
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self.roms = [bytes(rom) for rom in self.ds_sensor.scan()]
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print(f'Found {len(self.roms)} DS18X20 sensor(s)')
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return self.roms
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except Exception as e:
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print(f'Error scanning sensors: {e}')
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return []
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def read_temp_c(self, rom=None):
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"""Read temperature in Celsius. If rom=None, reads first sensor."""
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try:
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self.ds_sensor.convert_temp()
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time.sleep_ms(750)
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if rom is None and self.roms:
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rom = self.roms[0]
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if rom:
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return self.ds_sensor.read_temp(rom)
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return None
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except Exception as e:
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print(f'Error reading temperature: {e}')
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return None
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def read_temp_f(self, rom=None):
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"""Read temperature in Fahrenheit."""
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temp_c = self.read_temp_c(rom)
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if temp_c is not None:
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return temp_c * (9/5) + 32
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return None
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def read_all_temps(self, unit='F'):
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"""Read all connected sensors. Returns dict of {rom: temp}."""
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results = {}
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try:
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self.ds_sensor.convert_temp()
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time.sleep_ms(750)
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for rom in self.roms:
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temp_c = self.ds_sensor.read_temp(rom)
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if unit.upper() == 'F':
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results[rom] = temp_c * (9/5) + 32
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else:
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results[rom] = temp_c
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except Exception as e:
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print(f'Error reading temperatures: {e}')
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return results
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# Example usage / test code
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if __name__ == "__main__":
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sensor = TemperatureSensor(pin=10)
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while True:
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temps = sensor.read_all_temps(unit='F')
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for rom, temp in temps.items():
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print(f'Sensor {rom.hex()}: {temp:.2f}°F')
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print()
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time.sleep(5) |