I recently build 2 large 15x15 LED matrixes for which i want to write a spectrum analzer script using the MSGEQ7 chip.
I am currently in the process of getting everything to work properly and i've ran into a problem with my chip:
I only can seperate between 4 different frequency regions instead of 7.
When i open the plotter and connect my phone via an Audio Jack and a 10k resistor and then start playing a sinus wave, starting from 0Hz, and ending at 20kHz i get
the first "rise" is comleted at ~500Hz, the second at 1500, the third at 4500 and the third at 15000Hz.
Im getting nothing in the bass region (60Hz), and every line seems to be drawn twice.
I've also tried code from a different website with similar results.
What am i doing wrong ?
Did i get a knckoff chip ?
And also: If i cant get this to work, is there another way to do something like this without extra hardware (maybe a PC-Programm with serial interface) ?
Any help is aprechiated.