Plug the power supply and switch from position 0 to position 1. The relay GPIO.14 turn on few seconds and turn off again.

45 to 60 seconds later, the routine script trigger the first lap.

Wire the fans as show in the picture.

routine.sh is active at the boot sequence.

crontab -e

@reboot option

you can change the range of the trigger simply by changing the two variables l.9 and l.10 :

mindel=540
maxdel=660

Each .wav file as a .txt score and .py script. The score was extracted from the midi files (midi folder). Due to the silence in the start of each track, i put a sleep() (l.52) to resynchronise a bit better with the sound.

Basicly, after analysis of each track, there is a list of note. eache fans will be trigger by certain note of this list. The number depend of the track and the length of the list.

We can easily change with rangeof[] list of in findGoodFan() function.

After parsing the .txt score, we look for :

• the last char of note_on/note_offto trigger ON or OFF
• the pitch of note=xx
• the duration call time=xxxx

There is a little offset we can adjust in ###TRIGGER NOTES part to avoid the note when the duration is below n millis l.67

We use RaleyPin=[14, 16, 8, 7, 12]
Le diagramme renseigne l'emplacement physique des relais.

Certains GPIO sont occupés par le DAC+ (iqaudio.pdf)