Lab 3 Mini Design Project: Spectrum Analyzer with Nokia LCD

Page last updated 28 Feb 2011, by Elliot Hernandez. 3 replies

Overview

This is a simple program that displays a spectrum analyzer on the Nokia LCD from an input through a 3.5mm audio jack. It uses FFT's to compute the fourier transform of the incoming audio signal and display the amplitudes across the screen at the different frequencies.

Components

mBed
mBed

Nokia Color LCD
Nokia LCD

3.5mm Audio Jack
3.5 jack

Audio Jack Breakout
jack breakout

Schematics

/media/uploads/gth646f/mobilelcdschematic1.png

DC Bias Circuit

circuit

Resources

Nokia LCD

Audio FFT

Spectrum Analyzer

main picture

Video

Code

Import programSpectrumAnalyzer

This is a simple program that displays a spectrum analyzer on the Nokia LCD from an input through a 3.5mm audio jack. It uses FFT\'s to compute the fourier transform of the incoming audio signal and display the amplitudes across the screen at the different frequencies.

Last commit 28 Feb 2011 by Elliot Hernandez

3 comments on Lab 3 Mini Design Project: Spectrum Analyzer with Nokia LCD:

Nathan Bennett
13 May 2011

Is it pausible to set it up for a larger band say 50khz to 500khz thanks

Anthony Mullen
20 Jun 2015

Hi I am thinking of doing a signal processing unit like the one you made for a college project I wanted to write my own FFT code to help me understand DSP more Did you write your own and if so was it difficult

BHAVIN DAVE
28 Oct 2017

How is 3.5 mm audio jack is interfaced with mbed ? and we need a mic to connect it with audio jack? Please share full schematics.

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