LED-Control-Python-Script/led.py

#!/usr/bin/python
import sys #reconocer lo que hay en la terminal
LED_PATH = "/sys/class/leds/beaglebone:green:usr3"

def writeLED(fileName, value, path=LED_PATH):
    """
    Ayuda de la rutina
    writeLED(fileName, value, path=LED_PATH)
    """
    fo = open(path + fileName, "w")
    fo.write(value)
    fo.close()
    return

def removeTrigger():
    writeLED("/trigger","none")
    return

print("Starting App")

if len(sys.argv)!=2:
    print("Incorrect number of arguments")
    sys.exit(2)
    
if sys.argv[1] == "on":
    print("LED on \n")
    removeTrigger()
    writeLED("/brightness", "1")
    print("LED3 on \n")
elif sys.argv[1] == "off":
    print("LED off \n")
    removeTrigger()
    writeLED("/brightness", "0")
    print("LED3 off \n")
elif sys.argv[1] == "blink":
    print("LED blinking \n")
    writeLED("/trigger", "timer")
    writeLED("/delay_on", "500")
    writeLED("/delay_off", "500")
elif sys.argv[1] == "help":
    print("This is an application to control User LED 3")
	print("List of commands: ")
    print("on - Powers on the LED")
	print("off - Powers off the LED")
	print("blink - Makes the LED blink")
else:
    print("Error: This is not a command for this application")
    print("These are the commands you can use: ")
    print("on - Powers on the LED")
	print("off - Powers off the LED")
	print("blink - Makes the LED blink")
    
print("Script done")