MIDI out with Labview and windows 7

[yatang]

Hi there,

I'm currently doing a simple project in Labview.

Reading the voltage from DAQ, if voltage in channel 1 > 0.5V, laptop plays "do",

                                                         if voltage in channel 2 >0.5V, laptop plays "re"

                                                         if voltage in channel 3 >0.5V, laptop plays "Mi" 

I know how to deal with DAQ, but I have no experience in MIDI, I don't know how to make laptop play musical note.

Could anyone give me some references or examples in this field? Thank you so much!

[GerdW · Accepted solution]

Hi yatang,

if voltage in channel 1 > 0.5V, laptop plays "do",

if voltage in channel 2 >0.5V, laptop plays "re"

if voltage in channel 3 >0.5V, laptop plays "Mi" 

LabVIEW has functions to play WAVE files. You could supply wavefiles for your DoReMi notes and play them as needed…

but I have no experience in MIDI, I don't know how to make laptop play musical note.

Do you have a MIDI interface?

Do you have a driver for that interface?

Do you have a LabVIEW driver for that interface?

It's the same as with any other interface/device you want to control programmatically: you need a suitable driver accessable from your programming language!

[zou]

You can use ActiveX to call Windows Media Player for MIDI files.

[yatang]

wow great idea! I can play "doremi.wav" as needed!! That's much easier than MIDI.

Thank you so much!

[alexderjuengere]

hi,

do you use your vi within a windows system? If you do so, you could use the winmm.dll to play midi notes on your speakers,

as shown in this projec by jallen88 :

https://decibel.ni.com/content/docs/DOC-19902

 but I agree, as Gerd pointed, using .wav files is much easier in this context