Week 13



I decided to do a multitouched pad based on Matt Keeter's work. I redesigned the pad layout for afterwords creating a multitouck synth. You can check how Matt did it hereusing processing.

The schematic remained the same:

I milled the top side of the board and changed the board bottom side to afterwords do a piano (I'm aware I will have to change the processing code for that.)

I the realized we did not have the required components and changed the assignement to a board with a phototransistor as input (bechellor #2).


Since I have started milling the board. Fisrt I started to do the multitouch and the realized we did not have 20 10k resistors I had to change my scope.

Thanks to Xavifor his caring and self explanatory FabLab website.

Back to the phototransistor board I milled, and afterwords programmed, here's the component datasheet.


I won't bore you with the step by step solding, however you can check my solding strenght on the fouth week.Here's the final board:

After testing it s trace wasn't properly milled so minor cable solding needed to be made:

I spotted this not with the wiring test but afterwords when I tryed to connect the board to my PC. All set.


I programmed the board with fabISP. See connection below:

And run Neil's makefile

sudo make -f hello.light.45.make program-usbtiny

Then pluged the phototransistor's board to teh computer as it follows:

Then run Neil's python file

python hello.light.45.py/dev/tty.usbserial-FT94S6V5

Note: If you want to know the usb port name type the following code in your terminal:

ls /dev/tty.*

You can see further programming tests with processing on the 15th week where I use this board for communication and networking tests.

Code explenation

Since I used Neil's basic code, find below the code explenation. You can also check my 16th week in which I did over 5 differents test using the very same phototransistor and several codes using mainly processing even if I did also give it a try to phyton.

For the phyton basics I really recommend the codeacademy basic tutorial, It takes a while but it's worth the time. You can aldso check this < a href="https://wiki.python.org/moin/PointsAndRectangles">that gives a less detailed but quicker insight on rect commands. Tkinter needs to be read which can be on the former link or using Lynda's tutorial. I did both but I recommend Lynd'as GUI development tutorial you can find < a href="https://www.lynda.com/Tkinter-tutorials/Python-GUI-Development-Tkinter/163607-2.html">here.

The code establishes an amount of time and frequency in which values will be gathered, then a threshols for value data representation (meaning how a variation of the phototransistor value will be represented into the screen, what's the corresponance between value gathering and teh bar variation)

Remember I developed this code further on my < a href="../htm/W16.htm">week # 16 using a tree, an elypse and a basic rectangle.

Hello visitor. You can download all the working files of this week here.

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