Hi. I have made a system with O Pi Lite and Armbian to automate an aquarium from where to control the light, the bubbles and with a webcam I can see the system through the web, everything automated from Cron. From a web page I can turn on and off the lights and bubbles from web buttons. Everything is fine.

The problem arises when I want to put some phisical buttons for 3 things: turn off the system, change the state of light and bubbles. I have used a code in Python and the PYA20 library. This is the code. It works very well, but when I start it with the system, the program stop working soon and the buttons stop to work.

 

#!/usr/bin/env python
from pyA20.gpio import gpio
from pyA20.gpio import port
import subprocess
import time
import os

# PIN 29 - IN Light (luz)
onoff = port.PA7
# PIN 7  - IN Bubbles (burbujas)
luzboton = port.PA6
# PIN 8  - IN Shutdown
burbujasboton = port.PA13
# OUT Pins
luzvivo = port.PA8
burbujasvivo = port.PA9

gpio.init()
#Button ON-OFF
gpio.setcfg(onoff, gpio.INPUT)
gpio.pullup(onoff, gpio.PULLUP)
#Button light
gpio.setcfg(luzboton, gpio.INPUT)
gpio.pullup(luzboton, gpio.PULLUP)
#Button bubbles
gpio.setcfg(burbujasboton, gpio.INPUT)
gpio.pullup(burbujasboton, gpio.PULLUP)
# OUT
gpio.setcfg(luzvivo, gpio.OUTPUT)
gpio.setcfg(burbujasvivo, gpio.OUTPUT)

while True:
    # PROCESS ON-OFF need 5 seconds to avoid mistaken shutdowns
    if gpio.input(onoff) == 0:
        #start counting pressed time
        print ("pulsado")
        time.sleep(5)
        if gpio.input(onoff) == 0 :
            os.system("shutdown now -h")

    # PROCESS LIGHT
    if gpio.input(luzboton) == 0:
        print ("pulsado luz")
        estadoluz = gpio.input(luzvivo)
        gpio.output(luzvivo, not estadoluz)
        time.sleep(1)

    # PROCESS bubbles
    if gpio.input(burbujasboton) == 0:
        print ("pulsado bubbles")
        estadoburbujas = gpio.input(burbujasvivo)
        gpio.output(burbujasvivo, not estadoburbujas)
        # To avoid bounce
        time.sleep(1)

If i check the procces, i can see it, but i can also see that consumes a lot of CPU:

 

ps aux | grep botones
root       652 95.1  0.6   8552  3412 ?        Rs   10:53   2:36 python /etc/init.d/botones.py start

What i am doing wrong?

 

Thank you in advance.

You need to add a "time.sleep(0.1)"  in your "while" loop ...

 

Well, now the consume of CPU lower to 0,1%... thank you very much.

 

BUT... still dying. The file is in /etc/init.d/ and have +x permission. The file starts but after a while dies.... The Python file is called "botones.py". In syslog:

 

Nov  7 16:31:03 localhost systemd[1]: botones.py.service start operation timed out. Terminating.
Nov  7 16:31:03 localhost rsyslogd-2007: action 'action 17' suspended, next retry is Tue Nov  7 16:31:33 2017 [try http://www.rsyslog.com/e/2007 ]
Nov  7 16:31:03 localhost systemd[1]: Failed to start (null).
Nov  7 16:31:03 localhost systemd[1]: Unit botones.py.service entered failed state.

If i run from the monitor, never dies....

Scripts in /etc/init.d should double fork, for launching long running processes like this start-stop-daemon, rc.local or systemd "simple" service type should be used.

I can not make it work from rc.local... i tried to launch with:

 

nohup python /home/orangepi/scripts/botones.py &

and with and without sudo but nothing never runs. I tried too to run from /etc/init.d/....

 

What am i lossing?

 

If it is running fine at the command line, I don't see why it is not running in /etc/rc.local ...

try adding " > /tmp/botones.log 2>&1" before the ampersand, maybe this log will provide you hints !

With:

nohup python /home/orangepi/scripts/botones.py > /tmp/botones.log 2>&1

in rc.local, nothing in /tmp folder..... And the script does not run at boot.

By the way, in my rc.local i have other scripts that runs normally:

 

#!/bin/sh -e

# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

/etc/init.d/entrehoras.sh
# CÁMARA HP
/etc/init.d/runmjpg.sh
# Cámara GEMBIRD
#/etc/init.d/runmjpgGEMBIRD.sh
nohup python /home/orangepi/scripts/botones.py > /tmp/botones.log 2>&1
#/etc/init.d/botones.sh
exit 0

 

BTW, you have an ampersand missing :

nohup python /home/orangepi/scripts/botones.py > /tmp/botones.log 2>&1 &

And you don't have any /tmp/botones.log created ? Strange  ! Add some print() in the python script ...

 

Try also to change the first line from " #!/usr/bin/env python" to " #!/usr/bin/python"

If previous scripts in /etc/rc.local don't return execution (they have no ampersands either and no "start" parameter that suggests that they are a proper LSB init.d scripts) then the 3rd script simply won't be executed.

Yes!. It was the "&" at the end of the calls to the scripts. The 3 of them... Now i have too a "/tmp/botones.log".

 

With that and the "sleep.time(0.1)" at the end of the while, all works fine.

 

Thank you both!!!