Yes I've been using an opto-isolator, but it was a 6n137. Does it make any difference with the 138 ?
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Yes I've been using an opto-isolator, but it was a 6n137. Does it make any difference with the 138 ?
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It may.Originally Posted by novino
The 137 has a higher input current requirement than the 138.
And I think MIDI uses a 5mA current loop for it's signal, which is right at the absolute minimum specified for the 137.
It may not be creating a good signal on the other side.
Can't say for sure though.
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DT
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it works at last
Ok, thanks to you I found the problem ! The 6n138 and 137 don't have the same wiring . I got it working with by correcting the connection of the opto isolator
(basically, it's pin 5 to ground, 6 to Rx , 1,5kO res between 6and 7, and 7,8 to +5Vcc, the other pins are the same as 138)
I still have speed issues. The datas are received, but at a very slow pace(about a good midi pack by second). Do you see any way to improve the speed, to get a more "real-time" application ?
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