Raspberry Pi GPIO pins are Unprotected Ones.. So It is Preferred to use Arduino For IO interfacing and Rasperry pi for High Processing Power and Internet Connectivity
In this Project :
I send the Commands from Web Page to to the Raspberry Pi
and Raspberry Pi sends the Commands to the Arduino
according to the Received Command Arduino Will control the State and Brightness of LED
Code for Arduino
void setup(){
Serial.begin(9600);
pinMode(9,OUTPUT);
}
void loop()
{
if(Serial.available())
{
String inChar = Serial.readString();
if(inChar == "ON")
{
digitalWrite(9,HIGH);
Serial.println("LED is On...");
}else if(inChar == "OFF")
{
digitalWrite(9,LOW);
Serial.println("LED is Off...");
}else if(0 > inChar.toInt() < 1024)
{
analogWrite(9,inChar.toInt());
Serial.print("Led Brightness Value\t");
Serial.println(inChar.toInt());
}
}//end of available
}//end of loop
Python Code for the Raspberry Pi
import RPi.GPIO as GPIO
import time
import sys
import serial
from pubnub import Pubnub
ser = serial.Serial('/dev/ttyACM1',9600)
GPIO.setmode (GPIO.BCM)
LED_PIN = 4
GPIO.setup(LED_PIN,GPIO.OUT)
pubnub = Pubnub(publish_key='pub-c-9e022950-208f-49aa-9873-c560add30b41', subscribe_key='sub-c-9ddf7ad2-cfec-11e5-b522-0619f8945a4f')
channel = 'anil'
def _callback(m, channel):
print(m)
ser.write(m['led'])
def _error(m):
print(m)
pubnub.subscribe(channels=channel, callback=_callback, error=_error)
and HTML code is:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Getting data from a sensor</title>
</head>
<body>
<header>
<h1>Control LED from Web Interface</h1>
<p>ON and OFF and Brightness Control</p>
</header>
<section id="main" role="main">
<button id="ledOn">LED ON!</button>
<button id="ledOff">LED OFF!</button>
</section>
<section>
<form id="form1">
Enter the Brightness Value <input type="text" id="inputValue">
<input type="submit" value="submit">
</form>
</section>
<footer>
Done By Kunchala Anil.. Using PubNub Data Streams
</footer>
<!-- including the latest PubNub JavaScript SDK -->
<script src="http://cdn.pubnub.com/pubnub-3.7.1.min.js"></script>
<script>
(function() {
// DOM
var buttonOn = document.querySelector('#ledOn');
var buttonOff= document.querySelector('#ledOff');
// This is the channel name you are subscribing in remote-led.py
var channel = 'anil';
// Init - Get your own keys at admin.pubnub.com
var p = PUBNUB.init({
subscribe_key: 'sub-c-9ddf7ad2-cfec-11e5-b522-0619f8945a4f',
publish_key: 'pub-c-9e022950-208f-49aa-9873-c560add30b41'
});
// Sending data
function sendValue() {
p.publish({
channel : channel,
message : {led : document.getElementById("inputValue").value}
});
}
function lightOn() {
p.publish({
channel : channel,
message : {led : "ON"}
});
}
function lightOff() {
p.publish({
channel : channel,
message : {led : "OFF"}
});
}
// Click event
buttonOn.addEventListener("click",lightOn);
buttonOff.addEventListener("click",lightOff)
document.getElementById("form1").addEventListener("submit",sendValue);
})();
</script>
</body>
</html>
You can Download The Source Code In My GitHub Repositories Here
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