Hello Thomas,
The good news is that you're actually doing what you want, the signal ramps up every 30 seconds. This would also work with DAQ hardware as long as the hardware you're using maintains whatever the last value written was.
The reason you're seeing a ramp on your Waveform Chart is that you're only plotting one point per iteration, so it looks like a ramp (you're writing one value every 30 seconds and nothing in-between). If you want to plot interim points, you'll need to add some logic that allows your loop to run faster than the increment rate and plots the same value multiple times. You'll also probably need to use something other than the loop iteration to determine the output, and you'll want an automatic stop condition of some sort- it seems unlikely that your voltage can continue increasing indefinitely!
Best Regards,
Tom L.
