update

NPM/get_data_modbus.py

@@ -14,7 +14,7 @@ Request
 \x01        Slave Address (slave device address)
 \x03        Function code (read multiple holding registers)
 \x00\x80    Starting Address (The request starts reading from holding register address 0x80 or 128)
-\x00\x0A    Quantity of Registers (Requests to read 0x0A or 10 consecutive registers starting from address 50)
+\x00\x0A    Quantity of Registers (Requests to read 0x0A or 10 consecutive registers starting from address 128)
 \xE4\x1E    Cyclic Redundancy Check (checksum )
 
 '''

NPM/get_data_modbus_loop.py

@@ -0,0 +1,122 @@
+'''
+Loop to run every minutes
+* * * * * /usr/bin/python3 /var/www/nebuleair_pro_4g/NPM/get_data_modbus_loop.py
+
+saves data to a json file /var/www/nebuleair_pro_4g/NPM/data/data.json
+'''
+
+import serial
+import sys
+import crcmod
+import time
+import json
+import os
+
+# Ensure a port argument is provided
+if len(sys.argv) < 2:
+    print("Usage: python3 get_data_modbus.py <serial_port>")
+    sys.exit(1)
+
+port = '/dev/' + sys.argv[1]
+
+# Initialize serial communication
+try:
+    ser = serial.Serial(
+        port=port,
+        baudrate=115200,
+        parity=serial.PARITY_EVEN,
+        stopbits=serial.STOPBITS_ONE,
+        bytesize=serial.EIGHTBITS,
+        timeout=0.5
+    )
+except Exception as e:
+    print(f"Error opening serial port {port}: {e}")
+    sys.exit(1)
+
+# Define Modbus CRC-16 function
+crc16 = crcmod.predefined.mkPredefinedCrcFun('modbus')
+
+# Request frame without CRC
+data = b'\x01\x03\x00\x80\x00\x0A'
+
+# Calculate CRC
+crc = crc16(data)
+crc_low = crc & 0xFF
+crc_high = (crc >> 8) & 0xFF
+
+# Append CRC to the frame
+request = data + bytes([crc_low, crc_high])
+
+# Log request frame
+print(f"Request frame: {request.hex()}")
+
+# Initialize storage for averaging
+num_samples = 6
+channel_sums = [0] * 5  # 5 channels
+
+# Loop 6 times to collect data every 10 seconds
+for i in range(num_samples):
+    print(f"\nIteration {i+1}/{num_samples}")
+    ser.write(request)
+
+    try:
+        byte_data = ser.readline()
+        formatted = ''.join(f'\\x{byte:02x}' for byte in byte_data)
+        print(f"Raw Response: {formatted}")
+
+        if len(byte_data) < 23:
+            print("Incomplete response, skipping this sample.")
+            time.sleep(10)
+            continue
+
+        # Extract and process the 5 channels
+        channels = []
+        for j in range(5):
+            lsw = int.from_bytes(byte_data[3 + j*4 : 5 + j*4], byteorder='little')
+            msw = int.from_bytes(byte_data[5 + j*4 : 7 + j*4], byteorder='little')
+            raw_value = (msw << 16) | lsw
+            channels.append(raw_value)
+
+        # Accumulate sum for each channel
+        for j in range(5):
+            channel_sums[j] += channels[j]
+
+        # Print collected values
+        for j in range(5):
+            print(f"Channel {j+1}: {channels[j]}")
+
+    except Exception as e:
+        print(f"Error reading data: {e}")
+
+    # Wait 10 seconds before next reading
+    time.sleep(10)
+
+# Compute the average values
+channel_means = [int(s / num_samples) for s in channel_sums]
+
+# Create JSON structure
+data_json = {
+    "channel_1": channel_means[0],
+    "channel_2": channel_means[1],
+    "channel_3": channel_means[2],
+    "channel_4": channel_means[3],
+    "channel_5": channel_means[4]
+}
+
+# Print final JSON data
+print("\nFinal JSON Data (Averaged over 6 readings):")
+print(json.dumps(data_json, indent=4))
+
+# Define JSON file path
+output_file = "/var/www/nebuleair_pro_4g/NPM/data/data.json"
+
+# Write results to a JSON file
+try:
+    with open(output_file, "w") as f:
+        json.dump(data_json, f, indent=4)
+    print(f"\nAveraged JSON data saved to {output_file}")
+except Exception as e:
+    print(f"Error writing to file: {e}")
+
+# Close serial connection
+ser.close()