NotAShelf/air-quality-monitor
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handle serial port unavailable

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raf 2023-11-29 03:36:33 +03:00
commit 5c7691ba6b
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1 changed files with 6 additions and 1 deletions
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7
src/monitor.py
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@ -17,7 +17,12 @@ class AirQualityMonitor:
SERIAL_DEVICE = os.environ.get("SERIAL_DEVICE", "/dev/ttyUSB0") SERIAL_DEVICE = os.environ.get("SERIAL_DEVICE", "/dev/ttyUSB0")
def __init__(self): def __init__(self):
self.ser = serial.Serial(self.SERIAL_DEVICE) # if path does not exist, error and exit
if not os.path.exists(self.SERIAL_DEVICE):
raise RuntimeError(f"Serial device {self.SERIAL_DEVICE} not found.")
else:
print(f"Serial device {self.SERIAL_DEVICE} found.")
self.ser = serial.Serial(self.SERIAL_DEVICE)
def get_measurement(self): def get_measurement(self):
"""Fetches a measurement from the sensor and returns it.""" """Fetches a measurement from the sensor and returns it."""