PIC18F 16-bit FFT Real-Time Audio Spectrum Analyser

http://www.waitingforfriday.com/index.php/Real-Time_Audio_Spectrum_Analyser

This project is a real-time audio spectrum analyser based on the PIC18F4550 8-bit microcontroller. It implements a 16-bit FFT with a Nyquist frequency of 10Khz programmed entirely in C. The output is a 128x64 graphical LCD showing 31 frequency buckets from 312Hz to 10Khz.

Complete project details are available on my website in the projects section.

Category:

Science & Technology

Tags:

• PIC
• PIC18F
• FFT
• real-time
• audio
• spectrum
• analyser

[lolerus]

Hey,

looks nice do you use a kind of an AGC circuit or anything like that, to be "independent" from the inputsignal value???

greetings

[simoninns]

@lolerus - There is no AGC, the circuit is designed to work from a standard 1-1V Peak-to-peak signal such as a standard line-out or mp3 player headphone output.

[zinkws]

Wooww

Nice job simoninns!

I saw you website 1 month ago and find a project I liked. It is the RGB VU. I download the source and I am studing it to try to made a version of the TLC5940 library in PCW CCS, because I do not know very much about C18. Maybe I can do this....

About this video, hum...

I can not beleave that a simple PIC can do a FFT with quality like this one.

You coment early that the original ideia was do the FFT in C#. Do you have any materials that can help us in this way?

Bye

[simoninns]

@zinkws - The C code for this project should be very portable and easy to move to a compiler other than Hitech picc 18. The code was originally developed in C# to make it easy to debug. You simply use the maths library to create a sine wave which can be fed to the FFT routine to test the output. Once it's working you can then move the FFT routine to any compiler you like; although you should be able to port directly between the two PIC compilers without too much trouble.

[abidibrahim]

You did awesome job Simon thanks

can i ask about the name of MP3 music that you used in your demonstration?

[simoninns]

@abidibrahim - It's by FantomenK, you can find the link at the end of the video.

[vapgames]

Yay FantomenK!

[energy27uk]

Just built a couple of these, fantastic project!! Thanks for taking the time to document it and making it so easy to follow.

[wilmar88]

Nice work! thanks!

[frankbuss]

@simoninns Using a hardware interface and developing on PC is a good idea. I do this, too, but usually I write a hardware layer and simulate all the hardware on PC, too, so I don't need any hardware. Then just implementing the hardware layer for the target microcontroller and usually it works :-)

BTW: see my latest video for a nice and easy to use OLED.