chapelier fou Posted April 2, 2013 Report Posted April 2, 2013 Hi ! I want to connect 8 pots to my Midi I/O core. When i edit a preset file within a table editor, it displays inputs 0 to 5. I would imagine it going from 0 to 7. Can i simply add 2 lines in the table ? thanks ! Quote
chapelier fou Posted April 2, 2013 Author Report Posted April 2, 2013 As a side note, i've got a lot of parasites when sending a CC. My Pots are 4.7 KOhm with 100 nF capacitors. it looks like the capacitors are not filtering anything. By parasites i mean many occasional drops to 127, or constant flow of +/- 1 in the CC's value. Any idea ? Quote
TK. Posted April 2, 2013 Report Posted April 2, 2013 Hi, J5B.A6 and J5B.A7 are allocated by the third MIDI IN/OUT port, therefore these pins can't be used as analog inputs. And the "parasites" (jittering values) are unfortunately normal - there is no way to fix this properly. The LPC17 has bad ADCs, and they are only working at 3.3V which means that the s/n ratio is lower than for ADC working at 5V. Therefore the usage of the AINSER64 module is recommended. In future, also an inexpensive AINSER8 module for 8 inputs will be available: http://www.ucapps.de/mbhp/mbhp_ainser8.pdf (prototypes are ordered). Due to the simplicity, this "module" could also be built on veroboard (cheapest solution). Best Regards, Thorsten. Quote
chapelier fou Posted April 2, 2013 Author Report Posted April 2, 2013 i see ! Makes sense ! Well, i'll go for an AINSER 64 then ! Thank you very much for your answer. MidiBox is so great... awesome community as well. Quote
folly Posted May 7, 2013 Report Posted May 7, 2013 HISolved the problem of parasites with Ainser64?thank! Quote
chapelier fou Posted May 7, 2013 Author Report Posted May 7, 2013 Hi folly ! i'm still waiting for my AINSER64 kit, it should arrive shortly. I'll let you know, but i'm pretty confident, since TK. recommended it precisely for this reason. I'll post back here. Quote
folly Posted October 1, 2014 Report Posted October 1, 2014 I have not yet solved the problems with jitter even though I tried with ainser64. with STM32F DISCOVERY you solve this problem? Quote
chapelier fou Posted October 1, 2014 Author Report Posted October 1, 2014 Very sorry, i've used midibox only once, and since i broke my AINSER chip, i ended up using an arduino for pots. Quote
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