HIYA We need the frequencies for the notes from middle c throgh to c1 ie C D E F G A B C D inorder to complete a Science project. Anyone know them or wher to get them A google search has not helped thus far Thanks
Is it a picaxe 08 or a picaxe 08-M version? (or something elese)
picaxe -M can support a proper "play"command whereas the original could only generate tones. (you can sweep them using step commands, generate PWM noises and a pseudo white noise by increasing the variable beyond "limits", use lookup tables and the like but this is getting a bit advanced) I made a funky little beat machine once using 3 sound generators off the axe as tone, PWM, noise and filtered it using analog stuff switched by a further ouput..
Middle "C" (C4) is about 262 Hz, C1 is about 32 Hz C2 is about 66Hz , C3 is about 130Hz
I cheated and just went log Octal, 32, 64, 128, 256, 512 etc, the notes were a little "flat" but nobody really cared if the notes from some squarking device were slightly off key.
I developed and built a light following buggy which used the picaex 08, as a programming exercise for my students.
We had a play with the sound command. I had a list of frequencies and their associated notes. The students were given the task of firstly getting the chip to play the national anthem and then to come up with a tune of thier own. Needless to say there were the expected Smoke on the water attempts SMILES..
However I have since misplaced my list.
The list was generated by running a for next loop to play a slowly increaing tone. We debugged the variable. The notes was played into a piano tuner. When a "pure" note was reached we noted down the frequency from the debug table. Thius a list of quite accurate frequencies and thier associated notes was generated.
I used a students' piano tuner for this, else I woudl just repeat the exercise again myself.
I am now developing a project with my son, using the picaxe 28, for his science fair, and need the notes played to be as accurate as possible.