Linux Battery and Power Usage Monitoring Script

power-usage

#!/usr/bin/env python2
import os

def readfile(path):
  f = open(path, 'r')
  if not f:
    return false
  val = f.read()
  f.close()
  return val

status = readfile('/sys/class/power_supply/BAT0/status').rstrip('\n');

if os.path.isfile('/sys/class/power_supply/BAT0/power_now'):
  power = readfile('/sys/class/power_supply/BAT0/power_now')
  power = float(power) / 1000000
elif os.path.isfile('/sys/class/power_supply/BAT0/current_now') and os.path.isfile('/sys/class/power_supply/BAT0/voltage_now'):
  current = readfile('/sys/class/power_supply/BAT0/current_now')
  current = float(current) / 1000000
  voltage = readfile('/sys/class/power_supply/BAT0/voltage_now')
  voltage = float(voltage) / 1000000
  power = current * voltage
else:
  print("Not Supported")
  exit(1)

charge_now = float(readfile('/sys/class/power_supply/BAT0/charge_now'))
charge_full = float(readfile('/sys/class/power_supply/BAT0/charge_full'))
charge_full_design = float(readfile('/sys/class/power_supply/BAT0/charge_full_design'))
charge_percent = round((charge_now / charge_full) * 100)
charge_percent_design = round((charge_now / charge_full_design) * 100)

print status + ': ' + str(round(power, 2)) + " W (" + str(charge_percent) + "%) design(" + str(charge_percent_design) + "%) " + str(round(charge_now / 100000, 1)) + " Wh remaining"