GerdW's post shows how you could approach it with an analog waveform. And that might be a good first step for you because you could use the built in square wave generator function 3 times to build up your overall waveform with 3 distinct duty cycles that each last for a little while. Here's what remains to be done:
- carefully think through the 'sampling info' input to that square wave generator. More on this below
- as shown, you'll get a square wave that transitions back and forth between +5 and -5 volts. You can easily change input parameters to make it vary between 0 and +5 volts
- you can also easily turn the analog data array from the waveform into a boolean array. That's something you can use if you want to convert over to a DO task.
On 'sampling info': For a 300 Hz square wave and a duty cycle *resolution* of 10%, you would need 10 samples per cycle. That means 3000 Hz sample rate. For a resolution of 1% on your duty cycle settings, you'll need 100 samples per cycle for a 30 kHz sample rate.
Then the # samples needs to representing the # cycles you want. For 10 cycles, you'll need 10 * (# samples per cycle).
-Kevin P
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