Getting Started Generating Data with Digilent Analog Discovery

This example shows you how to generate voltage data at a rate of 300 kHz.

Discovery Devices

Discover Digilent devices connected to your system using daqlist

daqlist("digilent")

ans =

  1×4 table

    DeviceID                     Description                            Model                  DeviceInfo       
    ________    _____________________________________________    ____________________    _______________________

     "AD1"      "Digilent Inc. Analog Discovery 2 Kit Rev. C"    "Analog Discovery 2"    [1×1 daq.di.DeviceInfo]

Create a DataAcquisition for a Digilent Device

dq = daq("digilent")

dq = 

DataAcquisition using Digilent Inc. hardware:

                     Running: 0
                        Rate: 10000
           NumScansAvailable: 0
            NumScansAcquired: 0
              NumScansQueued: 0
    NumScansOutputByHardware: 0
                   RateLimit: []

Show channels
Show properties and methods

Add an Analog Output Channel

Add an analog output channel with device ID AD1 and channel ID 1. Set the measurement type to Voltage. By default, the voltage range of the output signal is -5.0 to +5.0 volts.

ch_out = addoutput(dq, "AD1", "1", "Voltage");
ch_out.Name = "AD1_1_out"

ch_out = 

    Index    Type    Device    Channel      Measurement Type              Range               Name    
    _____    ____    ______    _______    _____________________    ____________________    ___________

      1      "ao"    "AD1"       "1"      "Voltage (SingleEnd)"    "-5.0 to +5.0 Volts"    "AD1_1_out"

Generate a Single Sample

Generate a single scan on-demand.

outVal = 2;
write(dq, outVal);

Set DataAcquisition Properties and Define the Output Waveform

Set the output scan rate to 300 kHz.

rate = 300e3;
dq.Rate = rate;

% Generate a 10 Hz sine-wave for half a second. The length of the
% output waveform and the specified output rate define the duration of
% the waveform (totalduration = numscans / rate).

f = 10;
totalduration = 1;
n = totalduration * rate;
t = (1:n)/rate;
output = sin(2*pi*f*t)';

Generate Data

write(dq, output);