Control LED Via Website

Step 1: What Are We Going to Do in This Project

I've been working with the Raspberry Pi 2 for about a month now, and when I got it I knew I want to control it, via a website from a mobile phone or computer.

I finally got the chance to find the easiest way to do this, it only needs a Raspberry Pi 2 (of course), resistor, led and an internet connection.

Let's get into it!

Step 2: Connecting the Raspberry Pi, Resistor, LED

When you get the resources, you sit down, and start connecting.

I have attached an image so it's easier for you.

As I mentioned in the previous step, the breadboard is there just for testing, it's okay if you just attach the LED and the resistor to the pins. (Do it on your own risk)

How do we attach a simple LED to our Raspberry Pi?

It's very easy.

First!

You need to determine the + and - of your LED. This is very IMPORTANT

To determine which is + and which is - you look at the length of the "legs" of the LED.

The LONGER is the + and the SHORTER is the -

Find more about this on: https://learn.sparkfun.com/tutorials/polarity/diod...

Now, get your LED and put it in your breadboard and with a jumper cable, connect the + to a GPIO (in the code I'm using GPIO 21, but you can use another GPIO, but don't forget to change it in the code later)

Connect the resistor on the - on your LED and the other side in a free slot of the breadboard.

!!!WARNING!!!

As you can see on the picture, a resistor has color codes, and at the end is a golden color code.

The golden color code goes into the breadboard, NOT into the - of the LED.


Now connect the resistor to a GND (ground) pin on your Raspberry Pi to close the circuit as shown on the picture!

Congrats, you connected an LED and a resistor to your Raspberry Pi

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    24 Discussions

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    jamills99

    3 years ago on Introduction

    there is an error in your code???

    exec("sudo python /home/pi/lightoff_1.py");#if the button is pressed we execute led2.py which turns off the light

    should read:

    exec("sudo python /home/pi/led2.py");#if the button is pressed we execute led2.py which turns off the light

    1 reply
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    DanielL58

    3 years ago on Introduction

    This is an outstanding tutorial gproduct! been working with computers for years and ive only recently started my treck with python. I really appreciate the well maintained and structured approach on this raspberry pi tutorial. Had mine up and running in no time. you really helped me feel extremely comfortable in my new environment here. thank you sir. well done!!!

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    noel.kuck

    3 years ago on Introduction

    The controller.php code is looking for file names different than the led1.py and led2.py. Need to be corrected to work.

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    noel.kuck

    3 years ago on Introduction

    I created a brief html file and it shows up when I direct my browser to the pi IP. So php is running.

    4 replies
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    gproductnoel.kuck

    Reply 3 years ago

    I think that you only copied the code on the instructable not from the fike, thats why its not showing

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    noel.kuckgproduct

    Reply 3 years ago

    I'm too much of a noob to know what I should have done differently. What is a "fike"? Where do I get the proper code? Thanks for all of your help.

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    noel.kuckgproduct

    Reply 3 years ago on Introduction

    Also, fyi, the controller.php file is not accessible from the Instructables page by anyone other than the administrator (you). That is what I typed it in.

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    noel.kuckgproduct

    Reply 3 years ago

    This is what I keep getting. Can you explain where the files need to be placed? I followed your instructions, at least I think so. Thank you.
     

    php.tiff
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    gproductnoel.kuck

    Reply 3 years ago on Introduction

    Well I think you should click on controller.php, if the buttons don't pop up you did something wrong.

    Check if you have php installed.

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    gproductgproduct

    Reply 3 years ago

    Did you download the php file and paste the code in? or did you write #this is the php part

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    noel.kuckgproduct

    Reply 3 years ago on Introduction

    i actually typed it in from the instructions one time, and copied and pasted another time. Same results. The "#this is the php part" is from your instructables code.

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    noel.kuckgproduct

    Reply 3 years ago on Introduction

    Did the complete install twice, per your instructions. Clicking on "controller.php" gives: "#this is the php part"

    No idea what could have been done incorrectly.

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    noel.kuckgproduct

    Reply 3 years ago

    Can you confirm the directory locations for the ledx.py and controller.php files?

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    gproductnoel.kuck

    Reply 3 years ago on Introduction

    You put the controller.php into the apache servers directory and the ledx.py into your main directory (cd ~)

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    noel.kuckgproduct

    Reply 3 years ago on Introduction

    Thanks. That is where they are located. The controller.php is in /var/www and the ledx.py(s) are in the cd ~ directory.