Midipal help no midi input !?

Discontinued DIY products MIDIpal
#1

Hello Mutable Instruments users

I have just finished to build my wonderful Midipal :slight_smile: BUT I dont have any midi input message comming in,

the red led is not blinkin & no data is viewed in the midi monitor
the 2 led is working when I reset the device and also the sequencer is outputing data, I am not able to use any of the app with midi input e.g arp chord memory ect…

Would like to mention that I have only test it with a 9v battery.

Any help will be appreciated

Best regards,

Dave

#2

Hey guys

Thank you all for the support! It is working correctly, the problem was indeed the diode that was not solder the right way :slight_smile:

Best regards from Montreal

Rqckmounted

#3

Which voltage do you have at pin 6 of the optocoupler, at rest and when sending a dense MIDI stream? If you have a scope you should see logic pulse (+3.3V at rest) for the MIDI messages.

#4

Check the diode is the right way around and the resistors are the correct values in the MIDI in area.