eptheca Posted January 28, 2013 Report Share Posted January 28, 2013 I'm building a MB64 controller for a synth. The synth is controlled with a Teensy ( similar to arduino) ATmega 32U4 I'm sending MIDI from my sequencer to the MB64 that merges the notes from the sequencer and the CC data from the pots connected to the Core My question: Do I need another optocoupler circuit between the Core and the Teensy? Or can just connect the PIC's TX to the Teensy RX? They are both powered by the same 5V circuit It just seams a bit "overkill" with the MIDI OUT resistors + MIDI IN circuit between them when they are powered by the same source. Quote Link to comment Share on other sites More sharing options...
nILS Posted January 28, 2013 Report Share Posted January 28, 2013 Within the same system you do not need another opto coupler. Quote Link to comment Share on other sites More sharing options...
eptheca Posted January 28, 2013 Author Report Share Posted January 28, 2013 thanks nILS I thought I had read that somewhere, but I needed to get it confirmed by a Guru :) Quote Link to comment Share on other sites More sharing options...
eptheca Posted January 28, 2013 Author Report Share Posted January 28, 2013 What about the 220 ohm resistor between pic's TX and MIDI OUT? Quote Link to comment Share on other sites More sharing options...
unuldinei Posted January 28, 2013 Report Share Posted January 28, 2013 is to protect the TX circuits from inside of uC ... Quote Link to comment Share on other sites More sharing options...
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