Mdthbs

This involves a raspberry pi and apache2 so I thought the question would be good to go here..

have never used web sockets and things like that before so I'm pretty lost and hoping for some guidance...

I have a python script that gives me two pieces of data...the angle of a servo motor and the distance of an object from the ultrasonic sensor.

I need this data to be sent to my website which has a radar imsge. As the angle changes the sweep on the radar image should change, and where there is an obstacle it should show on my radar.

My question is how can I get this data to the website in a continuous way? I have apache2 running on my website. Right now I'm already using Ajax requests to make motors run on my raspberry pi (it's like an RC car).

import RPi.GPIO as GPIO

import time



GPIO.setmode(GPIO.BOARD)

TRIG = 22

ECHO =18

GPIO.setup(TRIG, GPIO.OUT)

GPIO.output(TRIG,0)

GPIO.setup(ECHO, GPIO.IN)

GPIO.setup(33, GPIO.OUT)

pwm=GPIO.PWM(33,100)

pwm.start(5)

time.sleep(0.1)



class rotateRead():

    def To180andBackRead():



        angle=0

        for angle in range(0, 180, 1):

            GPIO.setmode(GPIO.BOARD)

            duty=float(angle)/10+2.5

            pwm.ChangeDutyCycle(duty)

            print angle

            time.sleep(0.1)

            GPIO.output(TRIG,1)

            time.sleep(0.00001)

            GPIO.output(TRIG,0)

            while GPIO.input(ECHO) ==0:

                pass

            start =time.time()



            while GPIO.input(ECHO) ==1:

                pass

            stop=time.time()



            print (stop-start) *17000







        angle=180

        for angle in range(180, 0, -1):

            GPIO.setmode(GPIO.BOARD)

            duty=float(angle)/10+2.5

            pwm.ChangeDutyCycle(duty)

            print angle

            time.sleep(0.1)

            GPIO.output(TRIG,1)

            time.sleep(0.00001)

            GPIO.output(TRIG,0)

            while GPIO.input(ECHO) ==0:

                pass

            start =time.time()



            while GPIO.input(ECHO) ==1:

                pass

            stop=time.time()



            print (stop-start) *17000





    for x in range(0,1,1):

        To180andBackRead()



GPIO.cleanup()

First of all you'll need to create an endpoint in your website.
The simpliest way is to create a file called robot_update.php with the following content.

<?php

$input_data = file_get_contents('php://input');

$decoded_data = json_decode($input_data);

//Do something with $decoded_data, update image or write it to the database.

?>

Next,
Send your data via http from python like so

import json

import urllib2



def update_robot(angle, distance):

    data = {

        'angle' : angle,

        'distance' : distance

    }

    req = urllib2.Request('http://yourwebsite.com/robot_update.php')

    req.add_header('Content-Type', 'application/json')

    res = urllib2.urlopen(req, json.dumps(data))

    res.read() 

Call this function in place where your angle and distance is calculated.
This will work just fine but remember to add proper restrictions to your robot_update.php.