Control Raspberry Pi GPIO Using an App

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Introduction: Control Raspberry Pi GPIO Using an App

Many people have asked for a tutorial on how to control the Raspberry pi GPIO pins using a app(you made yourself).

So here is a quick tutorial on how to do this. It will be mostly based on previous tutorials I made.

Let's get started!

Step 1: Parts

For this tutorial, you don't need many parts. You'll need:

  • A raspberry pi (any model should work, as long as it's connected to your network)
  • An android phone
  • A computer to put the app on the phone.

Step 2: The App

For the app, you can use the app from this tutorial I made. Just change the IP address in the app to the IP address of your raspberry pi.

So this app should do it just fine and you can change it to how you like it the most.

Step 3: Raspberry Pi

On the raspberry pi, you should install 2 things.

  • Wiring pi
  • apache2 with php5

Wiring pi is used to control the GPIO pins from the php page. Here you can see how to install siring pi.

Follow these instructions to install apache2 on a raspberry pi and also follow 'ADDITIONAL - INSTALL PHP' lower on the page.

Now the only thing you need to do is in '/var/www/html' remove index.html and make a new file index.php.

In index.php you add:

<?php 
exec("gpio mode 0 out");
exec("gpio mode 2 out");
exec("gpio mode 3 out");
if (isset($_GET['led1'])) {	
	if($_GET['led1'] == 1) {
		exec("gpio write 0 1");// pin 0 in wiring pi is gpio 17
	} else {
		exec("gpio write 0 0");
	}
}
if(isset($_GET['led2'])) {
	if($_GET['led2'] == 1) {
		exec("gpio write 2 1");// pin 2 in wiring pi is gpio 27
	} else {
		exec("gpio write 2 0");
	}
}
if(isset($_GET['led3'])) {
	if($_GET['led3'] == 1) {
		exec("gpio write 3 1");// pin 3 in wiring pi is gpio 22
	} else {
		exec("gpio write 3 0");
	}
}
?>

That's it. Now you should be able to control the GPIO pins of your raspberry pi using an app.

Step 4: Resume

That's it. I hope you liked it.

If you have any question whatsoever feel free to ask. If you have something you would like to see done, please let me know in the comments.

Laurens

3 People Made This Project!

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64 Comments

Is there a way to read also GPIOs pins using only PHP?

Great work. I've download the whole package (Android Studio) to see how it works but unfortunately I got around 19 errors while compiling :O Is it the code obsolete?

Hi there. Great work. Is code for Android Studio still valid? I've downloaded the whole files and it showed me a lot of errors. Thanks in advance

is there any way to receive the request using python??

Hafiz did you found anything on the Python side? to receive the request using python from android java.

There is a way to use $ Put to get some information from an input of raspberry pi and use that information in android studio?

pleaaaaaaaaseeeee

can you explain same with android things.......................

Awesome! Just learned a ton fumbling my way through this one! Question: I tried using my public IPaddress in the hopes that I could control the rpi from anywhere using the app. No dice. It brings me to an optimum login (testing it in my browser with the PublicIP/?led1=1). Is there anyway to do this or will this app only work if my phone is on the same wifi network as the rpi?

Hello,

I'm glad you liked it.
To use this app with your external IP, you have to open port 80 of your router, but as you get a 'site' already, your router is probably using port 80 for his own configuration page, you could try to change the port of the app and the port of the server. But you than have to open this port to use it.

This app + server aren't very safe, so there are risks connecting it to the internet.

Laurens

Hello Laurens,

Thank you so much for
such a wonderful and easy tutorial.This helped me a lot in understanding
the basics and also learn new things.I'm glad that i was able to get
this done in the first time.

Now,I'm trying to control servo motor
applying the same concept, but I'm not able to write php code for
controlling servo.It will be very thankful if somebody can help me on
this