Foggy Mountain is an installation that reflect the life of ancient Chinese literati. The life that immerse in the nature and play string instrument towards foggy mountain. It is an universal feeling to experience relaxed mood and unified soul while being surround by nature. Breath in, Breath out. We are actually interacting with nature every second. Guqin, is a special traditional string instrument in China, it has been endowed with our infinite emotional conversation with nature. Every time you play a string, it vibrate its sound out to nature. Foggy Mountain vivid these abstract feelings by visualising the sense of nature vibrating back.
HOW IT WORKS______
By playing different strings, you will get rising fog from different areas according to the frequency of sound. The movement of pattern that being projected onto the fog is synced with the frequency of the string. The higher the frequency, the left the fog will show up, the faster the movement is.
Foggy Mountain use a guitar pickup as input, 50 fans to control the fog up and down and also a projector to project pattern.
At first, I played with different structure that can help my 50 fans to suck all the fog up. The first thing came to my mind was funnels. So I tried different funnels and tried to insert fan into it.
And then I found it might not be the best solution to assemble all the 50 fans as the funnel way. So I changed it to insert them into a box. I prototyped several versions of it and settle down to a box that has 50 holes.
Then I laser cut my acrylic board and assembled all the fans onto it. The fans are organized 5 a row. So it has 10 paralleled circuit signal output.
After this I assembled the box together and started to build my fog generator. It consists 6 Mist Maker
In the end, I got my controlable fog generator.
This project contains 2 main circuits. One is for controlling all the fans, the other is to amplify the signal from guitar pickup and transfer it to Arduino`s analog input.
Fan control circuit includes transistor TIP120 and an extra 9V 2A power supply. The current for each fan is 0.14A, because the maximum rows I need to be on at the same time is 3, that would be 3*5=15 fans need to be power at the same time. So I need 0.14*15=2.1A at the same time.
AMP circuit is followed a tutorial online.
The main part of this circuit is LM386, which do the amplify work.
After prototyping with breadboard, I soldered it to a small pcb board.
The project also contains 2 main code. One for Arduino the other for Processing.
The Arduino code mainly from Braulio Cancino and Aaron Montoya`s brilliant analyse algorithm to detect different frequency of note. Base on this, we will be able to know which string is playing which is not.
The processing code is to generate the pattern on the fog.