8106af624f
Le script get_data.py retourne maintenant toujours du JSON, meme en cas d'erreur (port serie, absence de donnees). Cote web, les erreurs sont affichees proprement dans la carte capteur. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
54 lines
1.3 KiB
Python
54 lines
1.3 KiB
Python
'''
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Script to get CO2 values from MH-Z19 sensor
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need parameter: CO2_port
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/usr/bin/python3 /var/www/nebuleair_pro_4g/MH-Z19/get_data.py ttyAMA4
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'''
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import serial
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import json
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import sys
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import time
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parameter = sys.argv[1:]
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port = '/dev/' + parameter[0]
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def read_co2():
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try:
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ser = serial.Serial(
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port=port,
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baudrate=9600,
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parity=serial.PARITY_NONE,
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stopbits=serial.STOPBITS_ONE,
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bytesize=serial.EIGHTBITS,
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timeout=1
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)
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except serial.SerialException as e:
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print(json.dumps({"error": f"Serial port error: {e}"}))
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return
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READ_CO2_COMMAND = b'\xFF\x01\x86\x00\x00\x00\x00\x00\x79'
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try:
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ser.write(READ_CO2_COMMAND)
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time.sleep(2)
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response = ser.read(9)
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if len(response) < 9:
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print(json.dumps({"error": "No data or incomplete data received from sensor"}))
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return
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if response[0] == 0xFF:
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co2_concentration = response[2] * 256 + response[3]
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print(json.dumps({"CO2": co2_concentration}))
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else:
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print(json.dumps({"error": "Invalid response from sensor"}))
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except Exception as e:
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print(json.dumps({"error": str(e)}))
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finally:
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ser.close()
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if __name__ == '__main__':
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read_co2()
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