Acquiring and Generating Data at the Same Time with Digilent Analog Discovery

Open Script

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

Discovery Digilent Device

Discover Digilent devices connected to your system usingdaqlist

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

Discover Digilent devices connected to your system usingdaqlist

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 using the listed Digilent device with IDAD1, channel ID1, and measurement typeVoltage.

addoutput(dq,"AD1","1","Voltage"); addoutput(dq,"AD1","2","Voltage"); ch_out = dq.Channels(1:2); ch_out(1).Name ="AD1_1_out"; ch_out(2).Name ="AD1_2_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" 2 "ao" "AD1" "2" "Voltage (SingleEnd)" "-5.0 to +5.0 Volts" "AD1_2_out"

Add an Analog Input Channel

Add an analog input channel with the same device and measurement typeVoltage.

addinput(dq,"AD1","1","Voltage"); addinput(dq,"AD1","2","Voltage"); ch_in = dq.Channels(3:4); ch_in(1).Name ="AD1_1_in"; ch_in(2).Name ="AD1_2_in"

ch_in =指数类型设备通道测量类型Range Name _____ ____ ______ _______ ________________ __________________ __________ 1 "ai" "AD1" "1" "Voltage (Diff)" "-25 to +25 Volts" "AD1_1_in" 2 "ai" "AD1" "2" "Voltage (Diff)" "-25 to +25 Volts" "AD1_2_in"

Set DataAcquisition Properties and Define an Output Waveform

Set the generation rate to 300 kHz.

rate = 300e3; dq.Rate = rate;% Specify a 10 Hz sine wave for 1 second.f = 10; totalduration = 1; n = totalduration * rate; t = (1:n)/rate; output = sin(2*pi*f*t)';

Generate and Acquire Data

Generate a sine wave with amplitude 1 V on channel 1 and amplitude 2 V on channel 2 and acquire timestamped data at the same rate.

[data, startTime] = readwrite(dq, [output 2*output]);

Plot Acquired Data

plot(data.Time, data.AD1_1_in, data.Time, data.AD1_2_in); xlabel('Time (s)'); ylabel('Voltage (V)'); title(['Clocked Data Triggered at: 'datestr(startTime)])