Julian Posted February 15, 2006 Report Share Posted February 15, 2006 hi :)maybe anyone has more info how it works?would be a very nice controller!http://mrl.nyu.edu/~jhan/ledtouch/index.htmljulian Quote Link to comment Share on other sites More sharing options...
stryd_one Posted February 15, 2006 Report Share Posted February 15, 2006 W :o WI'm googling as you read this Quote Link to comment Share on other sites More sharing options...
stryd_one Posted February 15, 2006 Report Share Posted February 15, 2006 http://www.sensorsynergy.com/helpfulhints.htmThere ya go :)Edit: While you're at it guys: http://mrl.nyu.edu/~jhan/ check out this fella's other toys! Brilliant! Quote Link to comment Share on other sites More sharing options...
NorthernLightX Posted February 15, 2006 Report Share Posted February 15, 2006 If I read correctly, this is not going to work with blue LEDs, right?Ill have to build myself some sort of f8ilter/effect unit then, with red LEDs. Oh well, let's finish the SID first. Quote Link to comment Share on other sites More sharing options...
Dr_Nick Posted February 15, 2006 Report Share Posted February 15, 2006 You might want to check out the following threads as well:Topic: Any good ideas for implementing the following.....? LED array:http://www.midibox.org/forum/index.php?topic=5560.0Topic: led's as touch sensors:http://www.midibox.org/forum/index.php?topic=5709.0 Quote Link to comment Share on other sites More sharing options...
pay_c Posted February 15, 2006 Report Share Posted February 15, 2006 @northernlightX: It should work with any LED. As every LED is a photodiode for it´s own emitted frequency of light, the backscattered light is always the perfect one. So it should theoretically work with any LED.I only can´t imagine that a controller based on this baby can consist of one PIC. I more think you will need more than one controller. One for the matrix scanning and one for the LCD/MIDI/comm etc. Or you would have to use a DSP (I guess they have in the video, or?).Anyhow: It would be *** T O O O C O O O O L *** to have something like that controlling your stuff. Possibilities for such a device are HUGE, I think. :D Quote Link to comment Share on other sites More sharing options...
pay_c Posted March 2, 2006 Report Share Posted March 2, 2006 :/Like I thought: Here somebody really went deep in there and managed to get up to 30 LEDs running, but only with a master/slave solution: http://projects.dimension-x.net/archives/35 (In this pic only 8 LEDs are up)Here is his (not fully implemented) idea of the 30 LED matrix: http://forums.linear1.org/index.php/topic,469.15.html (last page)This guy uses 2 slaves and 1 master and states out that appr. 4 slaves can be used for appr. 60 LEDs (let´s say 64 just for coolness ;) ). So to have an full 8x8 LED touchpad you are very likely to need 4 slave-PICs (and NOT the cheap ones) and one master PIC for connecting the outer world (MIDI, LCD, perhaps RS232, comm to the slaves and stuff). btw: Funny thing is that the "slave" PICs have not one NOP operation to do as the master PIC has a NOP cycle of appr. 20-50 ms (!!!). ;)I really really don´t know if this is worth the effort, if you know what I mean. :/ :/ :/Anyhow STILL very interesting, perhaps there´ll be some solution nobody thought of in the next time... *peeeeerhaps* ...Greetz for now! :) Quote Link to comment Share on other sites More sharing options...
NorthernLightX Posted March 4, 2006 Report Share Posted March 4, 2006 I tried to read the article, but I don't understand most of it. Why does he need so much PICs? Does this toy need that much processing power? Quote Link to comment Share on other sites More sharing options...
pay_c Posted March 5, 2006 Report Share Posted March 5, 2006 Easy: Yep. At least at the moment.The human eye appr. has a scanning velocity of 40 ms (25 pics/second). So to bring up a "good" optical result, let's say maximum of 10 ms for a full scanning cycle is ok. For one LED he needs apr. 600 us, so eight LEDs use about 4,8 ms to get scanned.He stated out to get some 16 ch bi-directional multiplexers in there, the only question is if this does not ruin the scanning speed (16 LEDs would be theoratically 10 ms without the communication with the multiplexer). This salve/master combination actually is something to get it running, but certainly not the last step. A multiplexer will just be more complex to implement, that's the reason it's not there yet. There'll be more, I think & hope.Man, just thinking about getting in there, too... :) :) :DI think I will get in touch with him. This topic just got me... Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 8, 2006 Report Share Posted March 8, 2006 I was considering the use of a single-dimension LED sensor, EG just a line, not a grid.Doesn't have to be a straight line either... It could be really useful, think of it for replacement of pots/encoders and LEDrings... You could just have the LEDrings... Quote Link to comment Share on other sites More sharing options...
NorthernLightX Posted March 8, 2006 Report Share Posted March 8, 2006 I was considering the use of a single-dimension LED sensor, EG just a line, not a grid.Doesn't have to be a straight line either... It could be really useful, think of it for replacement of pots/encoders and LEDrings... You could just have the LEDrings...Wow, that's a pretty cool idea! I have a digital dashboard in my old car, and it would be awesome to recreate the rev-curve in leds on a midibox, which you could operate bij hovering your finger over it! Now I know what I'm going to do with my spare 5mm LED's 8) Quote Link to comment Share on other sites More sharing options...
pay_c Posted March 13, 2006 Report Share Posted March 13, 2006 Good news! I just got to know that the whole tuochpad programm was written in Protel Basic up to now!! That means when you go back to pure assembler there are high chances that the time for scanning the matrix will be much less (even with a multiplexer)! Cewl!So: "LED Touchpad" attached to the "ToDo" list. ;D Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 14, 2006 Report Share Posted March 14, 2006 So: "LED Touchpad" attached to the "ToDo" list. ;DNice :) Let me know if I can help with anything... I'm really keen to get a single line version of this working. Quote Link to comment Share on other sites More sharing options...
pay_c Posted March 14, 2006 Report Share Posted March 14, 2006 To be honest the last device I programmed was a 8051 one from Siemens (NOT Infineon - right). So that´s quite some time ago. I gotta get back to that and this can take a while. But as I really got many ideas and 80% of them are only functional with a microcontroller, this is a real BIG point for me.As soon as there are updates, I´ll let you know (can take a while anyhow).Greetz! Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 14, 2006 Report Share Posted March 14, 2006 As soon as there are updates, I´ll let you know (can take a while anyhow).No rush mate, I'm patient :) Quote Link to comment Share on other sites More sharing options...
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