update

sensirion/SFA30_read.py

@@ -0,0 +1,38 @@
+'''
+Read data from sensor (only once)
+/usr/bin/python3 /var/www/moduleair_pro_4g/sensirion/SFA30_read.py
+'''
+
+import time
+import json
+
+from sensirion_shdlc_driver import ShdlcSerialPort, ShdlcConnection
+from sensirion_shdlc_sfa3x import Sfa3xShdlcDevice
+
+# Connect to the device with default settings:
+#  - baudrate:      115200
+#  - slave address: 0
+with ShdlcSerialPort(port='/dev/ttyAMA5', baudrate=115200) as port:
+    device = Sfa3xShdlcDevice(ShdlcConnection(port), slave_address=0)
+    device.device_reset()
+
+    # Print device information
+    #print("Device Marking: {}".format(device.get_device_marking()))
+
+    # Start measurement
+    device.start_measurement()
+    #print("Measurement started... ")
+    
+    time.sleep(5.)
+    hcho, humidity, temperature = device.read_measured_values()
+
+    # Prepare data as a JSON object
+    data = {
+        "formaldehyde_ppb": hcho.ppb,
+        "humidity_percent": humidity.percent_rh,
+        "temperature_celsius": temperature.degrees_celsius,
+    }
+        
+    # Convert the dictionary to a JSON string
+    json_output = json.dumps(data, indent=4)
+    print(json_output)