nILS Posted August 25, 2003 Report Share Posted August 25, 2003 On the SID Step C there are some LEDs that display, which Oscillator, Filter, Envelope and LFO is enabled for editing. Could those be replaced by some 7-Segment-LEDs? If so, how much of a hassle would that be? Quote Link to comment Share on other sites More sharing options...
TK. Posted August 25, 2003 Report Share Posted August 25, 2003 This would be a job for somebody with programming skills who uses the same hardware. The implementation isn't so difficult.Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
nILS Posted August 26, 2003 Author Report Share Posted August 26, 2003 When I was fiddling around with that idea last night i noticed that it could be done quite easily with some additional hardware:All you'd have to do would be to run the power for the LEDs (for example the LFOs 6 LEDs) thru a dipswitch or hardwire it to the needed pins of the 7 segment LED. If you do that with all 6 LEDs you have a simple 7 Segment display for the numbers 1-6. Quote Link to comment Share on other sites More sharing options...
DriftZ Posted August 29, 2003 Report Share Posted August 29, 2003 hmm, just thinking..Under MIOS:Is it possible to use 7segment displays (3digit, 0-127)together with encoders instead of Ledrings?howmany of these could be used then with 1 DOUTX4?(7common wires for all digits + 1 per digit?makes..... 32-7=25... so 8 times 3digits, correct ?)& if it is possible, howmany per core ?thanks for any info on this :) Quote Link to comment Share on other sites More sharing options...
Kyo Posted August 29, 2003 Report Share Posted August 29, 2003 Just in case:http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=2554563945&category=4660 Quote Link to comment Share on other sites More sharing options...
DriftZ Posted August 30, 2003 Report Share Posted August 30, 2003 DriftZ:go read the download section at www.ucapps.deduh 8) Quote Link to comment Share on other sites More sharing options...
DriftZ Posted August 30, 2003 Report Share Posted August 30, 2003 Ok, so according to:http://www.ucapps.de/mios_download.htmlhttp://www.ucapps.de/mios/leddigits_16.pdfHow to drive 16 LED digits with a DOUTX4 module (schematic: leddigits_16.pdf). Up to 64 digits can be driven by a single core in this way.The MIOS intro says:http://www.ucapps.de/mios.htmlhandling of up to 128 LEDs, relays, Digital-Analog-Converters or similar output devices. In multiplex mode a nearly unlimited number of LEDs, LED rings and LED digits can be driven Hmm.... 64 is near unlimited ? :DI see that on the schematic that the digits are split in 2 groups of 8, each sharing the 8 wires...Could it be made to have 3 groups of 8 digits ?Does it have to be common anode displays, is this required by the software or the hardware ?Thanks for more light on this :) Quote Link to comment Share on other sites More sharing options...
TK. Posted August 30, 2003 Report Share Posted August 30, 2003 These are driver examples, the possibilities are unlimited, if you plan to use it with other configurations, you are able to change the code in order to adapt it to your hardware.If you want to connect more than 64 LED digits (512 LEDs by the way...), just time-multiplex 16 digits (makes 3 shift registers for 16 digits -> 80 digits = 640 LEDs) --- they won't be so bright like with the 8x8 configuration, but you shouldn't notice flickering.Another solution would be the use of an additional 7-segment decoder (idea by Pilo), so that one DOUT register can drive 2 patterns instead of 1. This would allow to drive 2*16 = 32 digits with 3 DOUT registers, makes 160 digits with a single core, makes 1280 LEDsAs I wrote: feel free to change the driver for your needs ;-)Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
DriftZ Posted August 30, 2003 Report Share Posted August 30, 2003 Cool, thanks for clearing this up, Mr. TK!I'll have to study MIOS a bit then. :)Not sure howto use extra hardware tho, but I think the basics (1 core & some DOUTs) should be adequate.cheers Quote Link to comment Share on other sites More sharing options...
DriftZ Posted September 4, 2003 Report Share Posted September 4, 2003 Another solution would be the use of an additional 7-segment decoder (idea by Pilo), so that one DOUT register can drive 2 patterns instead of 1. This would allow to drive 2*16 = 32 digits with 3 DOUT registers, makes 160 digits with a single core, makes 1280 LEDsHey Thorsten, for driving 7segment, can't we use an interface made with 74sn7447 (or 7448 )? It will use less DOUT pin... I have been thinking about this, but...these are BCD-2-7seg decoders, so actually they only would reduce the number of common lines, right ?like instead of 8linesx8digits one would get 4linesx8digits+4linesx8digits ?But would a 3 to 8 decoder (3^2=8 ) also work then ?or has it got to be a 'driver' IC ?(plz forgive my lack of knowledge of electronics terminology)best regards Quote Link to comment Share on other sites More sharing options...
TK. Posted September 4, 2003 Report Share Posted September 4, 2003 Hi,like instead of 8linesx8digits one would get 4linesx8digits+4linesx8digits ?no - you could use one DOUT register to select 2-of-16 digits at once (two digits selected at the same time), and another DOUT register (which drives the two 7-segment decoders) to send the patterns.But would a 3 to 8 decoder (3^2=8 ) also work then?Sure - this would increase the max. number of digits even more! It only requires some (small) modifications in the driver. Just begin to work with the digits and you will notice how easy they can be handled. :)It would be nice if you could write a report (could be uploaded to the MIDIbox portal) which describes your variations and gives some programming examples so that other people can don't have to re-invent the wheel. Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
DriftZ Posted September 4, 2003 Report Share Posted September 4, 2003 errr... i'm trying to understand it, meanwhile:3^2=9 (ofcourse) & 2^3=8 !i'm trying to pour these theories into schematics atm, we'll see if it makes sense to me 8) Quote Link to comment Share on other sites More sharing options...
DriftZ Posted September 10, 2003 Report Share Posted September 10, 2003 Hello,I still am struggling with certain aspects  :-/http://www.ucapps.de/mios/leddigits_16.pdfOn this schematic, we have 1 DOUT module with 4 shift registers; could we call the black lines 'scanlines'  and the green & blue lines 'datalines' ?Then my question is, *must* the scanlines & datalines be on different shiftregisters ? (like it is done here)or would it be possible to have like e.g. 5 datalines & already 3 scanlines on the 1st shiftregister(SR) ?Then 5 scanlines & 3 datalines on the second SR; 2 datalines & 6 scanlines on the 3rd SR etc...Thanks again Quote Link to comment Share on other sites More sharing options...
TK. Posted September 11, 2003 Report Share Posted September 11, 2003 Yes, this is possible by changing the addressing scheme (please do some experiments with the circuit first in order to understand how it is working... it took me 15 minutes to write this example, but I don't want to explain all variations, because this would take hours)Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
DriftZ Posted September 11, 2003 Report Share Posted September 11, 2003 OK, thanks for clearing this up :)I'll do some experimenting for sure but I was thinking about using 2-1/2digit LEDdisplays, they have a multiplexed connection (5+4wires) & I just wanted to know before I start building some hardware that perhaps would possibly never work with MIOS.MFGDriftZ Quote Link to comment Share on other sites More sharing options...
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