Piezo frequencies

skewedToTheLeft

I'm trying to find out what the frequencies are for a couple of chords that I play on the guitar. In the "What's a Microcontroller" book·they give the frequencies for c6,c6# - c8 range, but I'm looking for the frequencies for Em7and Cmaj7. These chords are not the same as E7 and C7. Does anyone know where I can find the frequencies for these chords? Or where a good reference might be located on the web? I did a google search and I found a couple of references, but they did not show the frequencies for the chords I'm looking for.

Thanks

Mike Green

Remember that these are chords, not notes. They're made up of individual notes whose frequencies are all mixed together. The FREQOUT statement is limited to two frequencies that are mixed together and these chords require 4 notes played at the same time.

Here's a link from the Wikipedia for the diminished 7th chord: en.wikipedia.org/wiki/Half-diminished_seventh_chord
and here for the major 7th: en.wikipedia.org/wiki/Seventh_chord

Use any frequency chart for the notes including the half tones and you can lay out the frequencies needed starting at the E or C (see en.wikipedia.org/wiki/Major_seventh_chord)

For Cmaj7, you need C, E, G, B

skewedToTheLeft

I might try sending 1 note at a time with a very brief pause between the four notes that make up the chords. It seems that this might work.

Thanks