update

MH-Z19/get_data.py

@@ -0,0 +1,87 @@
+'''
+Script to get CO2 values
+need parameter: CO2_port
+/usr/bin/python3 /var/www/moduleair_pro_4g/MH-Z19/get_data.py ttyAMA4
+'''
+
+import serial
+import requests
+import json
+import sys
+import subprocess
+import time
+
+parameter = sys.argv[1:]  # Exclude the script name
+#print("Parameters received:")
+port='/dev/'+parameter[0]
+
+ser = serial.Serial(
+    port=port,
+    baudrate=9600,
+    parity=serial.PARITY_NONE,
+    stopbits=serial.STOPBITS_ONE,
+    bytesize=serial.EIGHTBITS,
+    timeout = 1
+)
+
+
+# Command to read CO2 concentration
+# Contains 9 bytes (byte 0 ~ 8) 
+# FIRST byte:  fixed to 0xFF
+# SECOND byte:  sensor number (factory default is 0 x01)
+# THIRD byte:  0x86 Gas Concentration
+
+# end with proof test value Checksum 
+ 
+
+READ_CO2_COMMAND = b'\xFF\x01\x86\x00\x00\x00\x00\x00\x79'
+
+
+def read_co2():
+    # Send the read command to the MH-Z19
+    ser.write(READ_CO2_COMMAND)
+    
+    # Wait for the response from the sensor
+    time.sleep(2)  # Wait for the sensor to respond
+    
+    # Read the response from the sensor (9 bytes expected)
+    response = ser.read(9)
+
+    # Print the response to debug
+    # print(f"Response: {response}")
+
+    # Check if the response is valid (the first byte should be 0xFF)
+    if len(response) < 9:
+        print("Error: No data or incomplete data received.")
+        return None
+
+    if response[0] == 0xFF:
+        # Extract the CO2 concentration value (byte 2 and 3)
+        co2_concentration = response[2] * 256 + response[3]
+        return co2_concentration
+    else:
+        print("Error reading data from sensor.")
+        return None
+
+def main():
+    try:
+        co2 = read_co2()
+        if co2 is not None:
+           # Create a dictionary to store the data
+            data = {
+                "CO2": co2
+            }
+            
+            # Convert the dictionary to a JSON string
+            json_data = json.dumps(data)
+            print(json_data)  # Output the JSON string
+        else:
+            print("Failed to get CO2 data.")
+
+    except KeyboardInterrupt:
+        print("Program terminated.")
+    finally:
+        ser.close()
+
+if __name__ == '__main__':
+    main()

MH-Z19/write_data.py

@@ -0,0 +1,88 @@
+'''
+Script to get CO2 values and write it to text file
+need parameter: CO2_port
+/usr/bin/python3 /var/www/moduleair_pro_4g/MH-Z19/write_data.py ttyAMA4
+'''
+
+import serial
+import requests
+import json
+import sys
+import subprocess
+import time
+
+parameter = sys.argv[1:]  # Exclude the script name
+#print("Parameters received:")
+port='/dev/'+parameter[0]
+
+ser = serial.Serial(
+    port=port,
+    baudrate=9600,
+    parity=serial.PARITY_NONE,
+    stopbits=serial.STOPBITS_ONE,
+    bytesize=serial.EIGHTBITS,
+    timeout = 1
+)
+
+
+# Command to read CO2 concentration
+# Contains 9 bytes (byte 0 ~ 8) 
+# FIRST byte:  fixed to 0xFF
+# SECOND byte:  sensor number (factory default is 0 x01)
+# THIRD byte:  0x86 Gas Concentration
+
+# end with proof test value Checksum 
+ 
+
+READ_CO2_COMMAND = b'\xFF\x01\x86\x00\x00\x00\x00\x00\x79'
+
+file_path = "/var/www/moduleair_pro_4g/matrix/input.txt"
+
+
+def read_co2():
+    # Send the read command to the MH-Z19
+    ser.write(READ_CO2_COMMAND)
+    
+    # Wait for the response from the sensor
+    time.sleep(2)  # Wait for the sensor to respond
+    
+    # Read the response from the sensor (9 bytes expected)
+    response = ser.read(9)
+
+    # Print the response to debug
+    print(f"Response: {response}")
+
+    # Check if the response is valid (the first byte should be 0xFF)
+    if len(response) < 9:
+        print("Error: No data or incomplete data received.")
+        return None
+
+    if response[0] == 0xFF:
+        # Extract the CO2 concentration value (byte 2 and 3)
+        co2_concentration = response[2] * 256 + response[3]
+        return co2_concentration
+    else:
+        print("Error reading data from sensor.")
+        return None
+
+
+
+def main():
+    try:
+        co2 = read_co2()
+        if co2 is not None:
+            print(f"CO2 Concentration: {co2} ppm")
+            output_file = "/var/www/moduleair_pro_4g/matrix/input_MHZ16.txt"
+            with open(output_file, "w") as file:
+                file.write(f"{co2} \n")
+            print(f"Data written to {output_file}")
+        else:
+            print("Failed to get CO2 data.")
+
+    except KeyboardInterrupt:
+        print("Program terminated.")
+    finally:
+        ser.close()
+
+if __name__ == '__main__':
+    main()