There is a small amount of assumed knowledge for this project - To save repeating myself, please familiarise yourself with the MSGEQ7 spectrum analyzer IC tutorial in Chapter 48 of our Arduino tutorials. And learn more about the LED cube from our review and the product page.
You can get the bare MSGEQ7 ICs from Sparkfun and the other usual suspects. It never hurts to have a spare one, so order two and matching IC sockets. Finally you should be able to translate a simple circuit to prototyping board.
Step 1: The circuit
For the purposes of this project our spectrum analyzer will only display the results from one channel of audio – if you want stereo, you’ll need two! And note that the strobe, reset and DCOUT pins on the MSGEQ7 are labelled with the connections to the cube PCB. Furthermore the pinouts for the MSGEQ7 don’t match the physical reality, so compare them against the pinouts in the second image.
The circuit itself will be quite small and fit on a small amount of stripboard or veroboard. There is plenty of room underneath the cube to fit the circuit if so desired.