MonkeyListen uses the FRDM-K20D50 board (which has a Cortex M4 core with DSP instructions) with the FRDM-OLED shield so you can make your very
own spectrum analyzer display The end result will be a functional DSP system that will analyze incoming audio content via an electret microphone on FRDM-OLED board and display the spectral content. The example code will also show you how to plot time domain data (a simple audio scope!), Frequency domain data (via an FFT) and a time-frequency plot (spectrogram). Extra I/O are provided to hack the code and create your own DMM or oscilloscope. The FRDM-OLED shield also has an optional RS-485 interface for doing cool things like driving a DMX lighting system!
You can order raw PCBs yourself from OSHPark or your favorite PCB vendor. The bill of materials for the FRDM-OLED is included with the build package on the FRDM-OLED page. Please let us know if you are interested in a pre-assembled version. If there is enough demand we will get some built via a Kickstarter campaign Don't be afraid to build it yourself, Soldering is fun! There is plenty of good stuff on the web on how to do SMT soldering. All of the parts on the board are fairly simply once you get the hang of it and everything can be hand soldered The key is having some decent tools.
Step 2: Put it Together
Attach The FRDM-OLED to the FRDM-K20D50. The FRDM-K20D50 comes with female headers that you can solder on so the boards can be easily separated.
Step 3: Download
Download the example software. The video "Loading and Configuring the MonkeyListen Example Software" will step you though downloading the program and doing some basic configuration.
Step 4: Say Something
Speak, Sing and Yell....
Step 5: Hack!
Do something else cool..... Make a DMM, or an o-scope....