I have read through a bunch of forums and still no luck.. I have a php file that executes a python file (liveSensor.py). It runs the py file once and stops, how to I keep the file open in the background? If I run sudo python liveSensor.py in the command line it just runs once as well but if I put sudo python -i liveSensor.py it stays open. How to I do this in php?
php file -
<?php
$try = exec('python sensor.py');
print_r ($try);
?>
In the liveSensor.py file I have 2 vibration sensors that are being detected and then passing that info into sqlite, then my php file retrieves that data and using ajax I can display it. All of this works great except launching the py file continually..
py script -
#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
import sqlite3
KnockPin = 12
ShockPin = 13
inning = 1
runs = 0
strikes = 0
balls = 0
print ("Welcome to Bases Loaded")
def setstr():
global strikes
strikes = 0
global balls
balls = 0
def setup():
GPIO.setmode(GPIO.BOARD)
GPIO.setup(KnockPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(ShockPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
def knock(ev=None):
with sqlite3.connect('basesLoaded.db') as conn:
global strikes
global inning
strikes += 1
if strikes ==0:
pass
elif strikes == 1:
conn.execute("UPDATE bl set STRIKE = 1 WHERE ID =1");
print ("Strike 1 :", conn.total_changes);
elif strikes == 2:
conn.execute("UPDATE bl set STRIKE = 2 WHERE ID=1");
print ("Strike 2 :", conn.total_changes);
elif strikes == 3:
global inning
inning +=1
conn.execute("UPDATE bl set STRIKE = 0 WHERE ID=1");
conn.execute("UPDATE bl set INNING = inning WHERE ID=1");
print ("Strike 3 Your Out :", conn.total_changes);
setstr()
print ("Inning Number :", inning);
def shock(ev=None):
with sqlite3.connect('basesLoaded.db') as conn:
global balls
balls += 1
if balls ==0:
pass
elif balls == 1:
conn.execute("UPDATE bl set BALL = 1 WHERE ID=1");
conn.commit()
print ("Ball 1 :", conn.total_changes);
elif balls == 2:
conn.execute("UPDATE bl set BALL = 2 WHERE ID=1");
conn.commit()
print ("Ball 2 :", conn.total_changes);
elif balls == 3:
conn.execute("UPDATE bl set BALL = 3 WHERE ID=1");
conn.commit()
print ("Ball 3 :", conn.total_changes);
elif balls == 4:
global runs
runs += 1
conn.execute("UPDATE bl set BALL = 0 WHERE ID=1");
conn.execute("UPDATE bl set RUN = 'runs' WHERE ID=1");
conn.commit()
print ("Run Scored! score is :", runs);
setstr()
def register_callbacks():
GPIO.add_event_detect(ShockPin, GPIO.FALLING, callback=shock, bouncetime=2500)
GPIO.add_event_detect(KnockPin, GPIO.FALLING, callback=knock, bouncetime=2500)
if __name__ == '__main__':
try:
setup()
register_callbacks()
except KeyboardInterrupt:
destroy()
This returns my 'Welcome to Bases Loaded' message in the browser but the py file wont stay open to detect the sensors.
For that kind of interaction you need to build a server script that runs in a separate process and uses a communication protocol, like a database for instance. If you think about it, the PHP runtime has no control about the python script: it can run it and provide you with the output, but how is the PHP runtime going to know when and how you may need results from the script?
A better approach would be to make a REST service with Python that provides the sensor data on demand and use Javascript to make AJAX requests and get the data as needed.