39 lines
1.1 KiB
Python
Executable File
39 lines
1.1 KiB
Python
Executable File
'''
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Read data from sensor (only once)
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/usr/bin/python3 /var/www/moduleair_pro_4g/sensirion/SFA30_read.py
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'''
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import time
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import json
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from sensirion_shdlc_driver import ShdlcSerialPort, ShdlcConnection
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from sensirion_shdlc_sfa3x import Sfa3xShdlcDevice
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# Connect to the device with default settings:
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# - baudrate: 115200
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# - slave address: 0
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with ShdlcSerialPort(port='/dev/ttyAMA5', baudrate=115200) as port:
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device = Sfa3xShdlcDevice(ShdlcConnection(port), slave_address=0)
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device.device_reset()
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# Print device information
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#print("Device Marking: {}".format(device.get_device_marking()))
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# Start measurement
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device.start_measurement()
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#print("Measurement started... ")
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time.sleep(5.)
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hcho, humidity, temperature = device.read_measured_values()
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# Prepare data as a JSON object
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data = {
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"formaldehyde_ppb": hcho.ppb,
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"humidity_percent": humidity.percent_rh,
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"temperature_celsius": temperature.degrees_celsius,
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}
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# Convert the dictionary to a JSON string
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json_output = json.dumps(data, indent=4)
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print(json_output)
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