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Yet another Portal-related instructable , but Different !
This one shows you how to :  
1)Build a very cheap device that plays an 8-bit version of Still Alive from Portal
2)On the same hardware , but with a different chip , play the "radio tune"

Here are both projects , in the same video (I hope the video quality does not affect how this entry is rated.I filmed it with a phone camera) :
Move on to the next step for the parts list for each of the two projects

Step 1: Parts List

As mentioned in the intro , the parts required for this project are really cheap.
What do you need ?
You need to know how to program AVR microcontrollers
Here's the parts list :
1)A 16 MHz crystal oscillator
2)A 75 Ohm (Or something around that value) resistor
3)An audio jack connector , so you can connect the device to speakers
4)A 7805 5Volt voltage regulator
5)For the 8 bit version of still alive you will need an ATMega16.For the second project , you will need an ATMega644.The parts above are common for both projects.
And the tools list :
1)An AVR programmer
...and that's it.You really don't need any tools , IF you have a breadboard and some wires .
But in case you don't have a breadboard , grab a perfboard , a 40 pin DIP socket for the microcontroller , a soldering gun , and solder everything on the board,according to the schematic (Which is in the next step).

Step 2: Build the Beast

This is extremely easy to build , as it uses a very small amout of parts.
The schematic is common , for both projects.You will only need to change the chip.
For the 8 bit version of Still Alive , use ATMega16
For the radio tune , use ATMega644

Both chips have the same pinout , so in case you are soldering everything to a perfboard , if you want it to ,make both projects on the same board, use a 40 pin DIP socket and swap the chips when you want.
The schematic is attached to this step.

Here are the firmware files for the AVRs:
1)8-bit Still Alive , for ATMega16 : https://sourceforge.net/projects/avrsa/files/StillAliveATMega16.hex/download
2)The radio tune , for ATMega644 : https://sourceforge.net/projects/avrsa/files/RadioTuneATMega644.hex/download

Step 3: Troubleshooting

The hardware is so simple , that you can't really have problems with it as long as you follow the schematic.The only problem that you may encounter is this one :
If the song sounds very slowed down compared to the video
Are you sure you configured your AVR to run on an external crystal ? Try to remove the 16 MHz oscillator.If it still works , it means it's running on the internal 8 MHz oscilaltor , and that's why it is so slow. Configure the fuse bits for External Crystal Oscillator (Leave all CKSEL bits unprogrammed).

Step 4: This Was a Triumph !

If you successfully built it and it works , then congratulations , the enrichment center is very proud of your huge success ! We are throwing a party in honor of your success.The companion cube is also there (Portal joke.Couldn't resist.)

Anyway , I hope you liked this instructable :)
<p>Looking over your design, you've used 6 pins, including vcc and 2 ground pins. Could this be done on the Attiny, which has 8 pins (1 ground, 1 vcc and 1 reset)?</p><p>I reckon 8 pins would be more than enough, and sure enough, <a href="https://www.instructables.com/id/Marioman/" rel="nofollow">https://www.instructables.com/id/Marioman/ </a> has got a similar application working.</p><p>Just wondering</p>
Is it bad that I know all the lyrics for &quot;Still Alive&quot;?
Can you provide source code in C or ASM? I just want to understand how to generate MIDI of song? What are the tools I need to cover other songs? Thanks for the post :)
Where did you get the microcontrollers I can#t find anyhere in my area (UK) that sells them ore ships for a reasonable price.. help?
I bought them online. There has to be an online shop in your country that sells cheap microcontrollers. just google Electronics shop. Good luck :)
how would a beginer in programing approach the 8 bit version??? <br>EPIC INSTRUCTABLE!!!!!!! <br> <br>THE CAKE IS A LIE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
i'm GLaD you like it<br>however this is not a beginner project<br>you need to know how to set up timer interrupt routines,how to generate waveforms,and you need to create your own music format in order to make this.<br>If you like it and wanna build one,just download the hex and get an atmega16.
ok then what would be the far easeist approach for the 8 bit?. if i can build it, it would be a triumph
sorry for the late reply<br>the easiest approach for the 8 bit song is what I already did.it's a very simple waveform generator that reads a song and modifies the frequencies
Great Instructable! <br> <br>One question: How did you program the songs? I'm trying to figure out how to duplicate your project with an Arduino. <br> <br>Thanks
Duplicating the radio song part of the project is easy<br>You just need to cut a part of the song that you will loop , and make a RAW file @ 6KHz out of it.Then make it an array in the program memory , and have an interrupt , which at each 1/6000 part of a second , outputs the next value in the array , or , if it reached the end , play it again from 0.<br><br>The 8-bit still alive , is rather difficult to make.Here is how it works : <br>It uses a sound engine which i used in a previous project, called Penguin Sound Engine.This sound engine has the same channels you would find on a NES : 2 Square channels , 1 triangle channel , and 1 noise channel.If you want to learn about how it works , go to my other instructables and have a look at penguin.You wanna check the soundfx.h header file , where there are the sound playing functions ,and the main.c file , under Void Interrupt() , where i put the play routine.<br>About the music file : it is converted from a .MOD file i found on the web.I have a program that takes the mod file and then converts it to an array that will be interpreted as music data by the microcontroller.The converter , however , is so slow and buggy , that i didn't even post it on the internet.If i find a way to make one that will work , maybe I will upload it.Anyway , you also have in the soundfx.c file the info about the file format , so , if you want more info about the sound engine , go check the Penguin instructable.

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Bio: I make electronic stuff.Because I Can.
More by Vladmakesstuff:Portal "Still Alive" on AVR microcontrollers Build the Penguin game system Change the led's from your keyboard 
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