Guest Perka Posted September 12, 2002 Report Share Posted September 12, 2002 Hi everyone!Does anybody know where you can buy a ribbon controller? And is it possible to connect it to a MIDIBox64? Just curious! :)/Pär Quote Link to comment Share on other sites More sharing options...
Guest SK12 Posted September 12, 2002 Report Share Posted September 12, 2002 Hi,maybe you can use a pc touchpad.Sascha Quote Link to comment Share on other sites More sharing options...
Guest Perka Posted September 12, 2002 Report Share Posted September 12, 2002 Great idea!But i wonder if it's possible to connect it to the MIDIbox64?Does anybody know how a touchpad work? Quote Link to comment Share on other sites More sharing options...
TK. Posted September 13, 2002 Report Share Posted September 13, 2002 Rippon controllers can be connected like common pots and don't require special electronic parts; here an example:This controller is from an AN1x synthesizer (it can be ordered as replacement part from Yamaha). With no pressure it has a very high impedance, thats the reason why a 10k pull-down is connected between the output wire and ground in order to prevent floating values. With preasure the resistance varies from 0k to 13k from the left to the right side.Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Guest Perka Posted September 13, 2002 Report Share Posted September 13, 2002 Great! Thanks!I will probably implement one when i build my MIDIBox64.But i think i will wait for the new motor fader extention first! Quote Link to comment Share on other sites More sharing options...
Guest SK12 Posted September 13, 2002 Report Share Posted September 13, 2002 Just curious, is it also possible to use pc touchpads, since you can easily get them from gutted laptops(ebay or try a local computer store-I just asked & got one for free).And I´d like to know the price of the Yamaha ribbon controller?Sascha Quote Link to comment Share on other sites More sharing options...
TK. Posted September 15, 2002 Report Share Posted September 15, 2002 Just curious, is it also possible to use pc touchpads, since you can easily get them from gutted laptops(ebay or try a local computer store-I just asked & got one for free).I don't want to open my laptop just to test this ;-) but since touchpads are based on the same technology, it should work on the same way. And I´d like to know the price of the Yamaha ribbon controller?I'm not sure, but my experiences with the Yamaha service center are very good. Some years before I wanted to replace a damaged key; after I phoned with the german agency, I got a replacement in between 2 days for about 10 DM (= 5 EUR) (inclusive shipping!)Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Guest Perka Posted September 16, 2002 Report Share Posted September 16, 2002 Hi again, Found this when i did some search on PC touchpad'shttp://www.synaptics.com/decaf/utilities/tp-intf2-4.PDFIt's a PDF document on how to interface to a synaptics touchpad.Maybe this could help someone?/Pär Quote Link to comment Share on other sites More sharing options...
gillesdeshays Posted September 19, 2002 Report Share Posted September 19, 2002 It's a "measuring capacitance" system on a grid ...It's gonna be tricky to use it ...Any Ideas , Mad Scientists ? ;DGilles Quote Link to comment Share on other sites More sharing options...
Duggle Posted September 20, 2002 Report Share Posted September 20, 2002 hi,use the variable capacitances with a simple oscillator (using a gate from a 74hc00 for example) then have the resulting square wave feed a Frequency to voltage chip such as LM2907 (around $2 or less) . Set up the chip to provide 0 to 5V output range for the Ain. (Use series resistor and 5V1 zener to protect Ain against higher voltages!) Quote Link to comment Share on other sites More sharing options...
gillesdeshays Posted September 20, 2002 Report Share Posted September 20, 2002 I didn't find any mechanical schematic on these touchpad :'( ... I understood that's a grid ... but i dunno the resolution ... If there's is 256 values for X and 256 for Y... We cannot use a LM2907 for each line ... The PCB will be 1 m² !!! :DIf the grid is a lower resolution may we can do it ...But .. we have to control also the "Z" parameter : the pressure...I think, "say me if i'm wrong", it's too hard to convert this touchpad in the MBHP world... no ? ??? Quote Link to comment Share on other sites More sharing options...
Duggle Posted September 20, 2002 Report Share Posted September 20, 2002 yes, I am asuming that the touchpad has something like three terminals common,Xout and Yout, and that the touchpad provides a variable capacitance between common and Xout for x axis and between Yout and common for y axis. I'm only guessing and the reality may be quite different.So I suppose I should ask, How many connection pins are there on this touchpad? Quote Link to comment Share on other sites More sharing options...
Guest SK12 Posted September 20, 2002 Report Share Posted September 20, 2002 I disassembled my touch pad and the pcb is glued right onto the pad, so I think it´s useless.It´s a synaptics touchpad from a notebook, there are 24 connection pins on J1 & 8 on J2.Sascha Quote Link to comment Share on other sites More sharing options...
gillesdeshays Posted September 20, 2002 Report Share Posted September 20, 2002 Any chance to have a picture of theses connector and the pcb... ?a webcam capture ?Gilles Quote Link to comment Share on other sites More sharing options...
Guest SK12 Posted September 21, 2002 Report Share Posted September 21, 2002 I don´t have a web/digital cam.The touchpad is connected to another tiny pcb with the buttons & a plastic flat ribbon cable on it.There´s no J2 connector on this pcb and from J1 only only 6 pins are used.The are 5 connections on the plastic flat ribbon cable that goes to the motherboard(I guess). Sascha Quote Link to comment Share on other sites More sharing options...
Duggle Posted September 22, 2002 Report Share Posted September 22, 2002 Looking at the datasheet, I would assume that the 5 wire connection to the motherboard is a PS2 or similar connection. Writing the firmware mod to interface this to the MBHP is a big job with little RAM/ROM to work with.Converting a variable capacitance into 0-5V is quite simple using the method described earlier, I think. However the touchpad does not seem suited to this. :-/BTW, If one was very keen, one could use a dedicated MBHP core module to decode the PS2 touchpad data and produce X and Y 0-5V using the two channels of PWM on PortC! One could also use Port I/O pins to activate button closures! ;) Quote Link to comment Share on other sites More sharing options...
Guest stiffman Posted October 24, 2002 Report Share Posted October 24, 2002 I dunno if its more or less complicated, but i picked up a touch pad that plugs into the serial port of a PC, works like a normal com mouse.It also brings up the idea of using PC mice to controll things aswell Quote Link to comment Share on other sites More sharing options...
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