how to generate positive only sawtooth waveform?

[LV_Enthu]

hello, i want to generate a positive only sawtooth waveform, starting from zero, and ramping up to 3.3V, and coming back down only up to zero value, and not swinging to -3.3V. is it possible to do that in labview 11? 

something like below. 

[johnsold]

If you are using the Waveform signal generation VIs, they have an offset input. If you are using the array output signal generation VIs, they have an offset input. If you are using the array output signal generation VIs, use Array Max & Min to find the minimum value in an array and add the negative of that to the array.

Lynn

[Dennis_Knutson · Accepted solution]

Of course. What have you tried? Have you looked at the Ramp Pattern function?

[LV_Enthu]

that worked! thx

[LV_Enthu]

i had a follow up question, how can i control the ramp rate both going up and going down?

[GerdW]

Hi LV_Enthu,

how can i control the ramp rate both going up and going down?

Maybe by setting the correct parameters for the ramp function?

Again the same question: What have you tried so far? Where exactly do you have problems?

[Dennis_Knutson]

I would hope that you are using two ramp functions if you want different rates.

[LV_Enthu]

hello,

i have tried out the ramp function, for going up and going down, i varied the number of samples as well which seems to change the ramp rate, but i am not sure if I can confidently say that the positive ramp is going from 0 to 1 V in lets say 20ms, or 40ms, or whatever the user specifies?

attached a snapshot of the vi that i have developed

[crossrulz]

Your ramp time is determined by the number of samples per ramp and the dt.  Right now, since your dt is just the reciprical of the number of samples, you get a ramp is 1 second.  You need to make your dt be the desired time of the ramp divided by the number of samples.  So in this case, you want dt = 40ms/16 = .0025 seconds/sample.