thin LLP midi controller (monome), arduino powered
Posted: 04 June 2011 01:11 PM   [ Ignore ]
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here is my project, it’s a thin LLP setup that uses an array of phototransistors for IR sensing and an array of LEDs for the display:


http://vimeo.com/20521691

I’ve also found an interesting hack with the light sensitivity:


http://vimeo.com/20955724


http://vimeo.com/20694014

here is a parts list and sourcing info:

· 25milliwatt 780nm laser diodes with 89º line lens from Aixis (http://www.aixiz.com/store/product_info.php/cPath/23_37/products_id/76/osCsid/b34f5228b6e31ea138cab340f3de7528 and http://aixiz.com/store/product_info.php?cPath=40&products_id=38)

· ¼” glass pane

· Rosco Grey projection screen (http://www.rosebrand.com/product703/Rear-Projection-Screen.aspx?tid=2#x2b;Projection)

· 64x 800nm IR phototransistors (http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&WT.z_homepage_link=hp_go_button&KeyWords=511-1357-nd&x=0&y=0)

· 64x white wide angle LEDs (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=C535A-WJN-CS0V0231-ND)

· Arduino Duemilanove (now the Uno) (http://www.sparkfun.com/products/666)

· LED driver ic (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=MAX7219CNG+-ND)

· Shift registers for monitoring sensors (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=MM74HC164N-ND and http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=MM74HC165N-ND)

· 3x .10uf capacitor (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=P4910-ND)

· 1x 10uf capacitor (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=P828-ND)

· 10x 10K resistors 1/4 W

· 7219 resistor (value determined by http://www.arduino.cc/playground/Main/MAX72XXHardware)

Documentation on firmware and serial setup is given here:
http://flipmu.noisepages.com/work/arduinome/

One problem I’ve had is that one of the pins (pin 8 I think) on the 74hc165 drops to a lower voltage than the rest, this causes the sensitivity of one row to be less.  I’ve tried powering the arduino directly and changing the resistor value on that pin, but it didn’t help.  I’m planning on switching over to 4051’s (http://www.arduino.cc/playground/Learning/4051) to control the LEDs, but I’ve been having some trouble with cross talk between the pins.  It would be great if I could do that because then the sensitivity of the sensors could be tunable.  If anyone has any input, it would be great to hear.

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Posted: 04 June 2011 01:13 PM   [ Ignore ]   [ # 1 ]
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I forgot to mention, thanks for all the help!

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Posted: 06 June 2011 02:02 AM   [ Ignore ]   [ # 2 ]
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very nice project, yeah it is thin but it seems it detects on low accuracy because of the big distance between phototransistors
with using of more phototransistors the accuracy can be efficient, anyway i liked it and thank you for sharing.

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my 19” LCD setup ----> turned into new look
my 60” FTIR setup (old video)

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Posted: 06 June 2011 08:27 AM   [ Ignore ]   [ # 3 ]
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I like the sounds that it creates duing sunrise smile
The sound of the nature.
If one could manage to install one of these in major cities around the globe, it could become a CD rasberry

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Posted: 06 June 2011 10:01 AM   [ Ignore ]   [ # 4 ]
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This is similar to something i did with my OptoSensor but i have far more sensors… http://mtaha.wordpress.com/optosensor/

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