nas_led/main_2.py

import subprocess
import re
import time
import serial

serial_port = serial.Serial('/dev/ttyACM0', 115200, timeout=1)

disks = ['sda', 'sdb', 'sdc', 'sdd']  # List of disks to monitor

def read_diskstats():
    with open('/proc/diskstats', 'r') as file:
        lines = file.readlines()

    disk_stats = {}
    for line in lines:
        data = line.split()
        if len(data) >= 14:
            if data[2] in disks:
                disk_stats[data[2]] = {
                    'reads': int(data[3]),
                    'writes': int(data[7])
                }
    return disk_stats
prev_stats = read_diskstats()
current_stats = read_diskstats()
print(current_stats)

while True:
    current_stats = read_diskstats()
    byte_array = bytearray()
    counter = 0
    for disk in disks:
        read_diff = current_stats[disk]['reads'] - prev_stats[disk]['reads']
        write_diff = current_stats[disk]['writes'] - prev_stats[disk]['writes']
        if read_diff > 0:
#            print(counter)
            byte_array.append(counter)
        else:
 #           print(counter+1)
            byte_array.append(counter+1)
        if write_diff > 0:
  #          print(counter+2)
            byte_array.append(counter+2)
        else:
   #         print(counter+3)
            byte_array.append(counter+3)
        counter += 4
    serial_port.write(byte_array)
    time.sleep(0.1)  # Adjust the frequency of checking disk activity (1 second in this example)
    prev_stats = current_stats