Marxon Posted March 15, 2013 Report Share Posted March 15, 2013 (edited) Hi MidiBoxers,first off all i want to thank TK for hisamazing MidiBox project.Spending all the time since over ten yearsand all this for free! Thats really impressive!Ucapps was thereason for me to learn more aboutelectronics and to live the d.i.y. way of life.THANK YOU TK!Ok finally here is my question:Does the button matrix latency only increase by adding rowsregardless the number of collums?Or does adding colums affect the latency too?I made a 7x4 matrix layout and wired them:7 rows (d-out lines) and4 colums (d-in lines).Now i wonder if it would be better to wire them "4x7 style"?But i guess 4x7 is better because all buttons in a rowcan be scanned together so there will be only 4 "row scans", right?Thanks for your advice!Best regardsMarxon Edited March 17, 2013 by Marxon Quote Link to comment Share on other sites More sharing options...
TK. Posted March 16, 2013 Report Share Posted March 16, 2013 The shift registers are scanned each 250 uS, means: with 4 rows the worst-case latency is 1 mS, with 8 rows 2 mS, with 16 rows 4 mS So - regardless of the row configuration, the latency is ignorable, you won't notice it. The number of columns don't increase the latency, because they are read during a single scan. Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Marxon Posted March 17, 2013 Author Report Share Posted March 17, 2013 Thanks for the info TK!Best regardsMarxon Quote Link to comment Share on other sites More sharing options...
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