Acquire Data from Multiple Channels Using an MCC Device

This example shows how to acquire data from multiple analog input channels with an MCC device.

Hardware Setup

This example uses a Measurement Computing USB-1608FS-Plus device to log data from analog input channels 0 and 9, which are connected to the outputs of a function generator.

Display a List of Available Devices

Discover devices connected to your system using daqlist.

d = daqlist("mcc")

d =

  1×4 table

    DeviceID                     Description                           Model                 DeviceInfo       
    ________    _____________________________________________    _________________    ________________________

    "Board0"    "Measurement Computing Corp. USB-1608FS-Plus"    "USB-1608FS-Plus"    [1×1 daq.sdk.DeviceInfo]

Get Details About a Device

The daqlist function shows you the overview of devices available. You can find additional device details by reviewing the DeviceInfo field of the table.

deviceInfo = d{1, "DeviceInfo"}

deviceInfo = 

mcc: Measurement Computing Corp. USB-1608FS-Plus (Device ID: 'Board0')
   Analog input supports:
      4 ranges supported
      Rates from 0.1 to 100000.0 scans/sec
      8 channels ('Ai0' - 'Ai7')
      'Voltage' measurement type
   

Create a DataAcquisition and Add Input Channels

The daq function creates a DataAcquisition object. The DataAcquisition contains information describing hardware, scan rate, and other properties associated with the acquisition.

dq = daq("mcc")

% The |addinput| function adds an analog input channel to
% the DataAcquisition.  You can add more than one channel to a
% DataAcquisition.
ch1 = addinput(dq, "Board0", 0, "Voltage");
ch2 = addinput(dq, "Board0", 1, "Voltage");

dq = 

DataAcquisition using Measurement Computing Corp. hardware:

                     Running: 0
                        Rate: 1000
           NumScansAvailable: 0
            NumScansAcquired: 0
              NumScansQueued: 0
    NumScansOutputByHardware: 0
                   RateLimit: []

Show channels
Show properties and methods

Acquire Timestamped Data

The read function starts the acquisition and returns the results as a timetable.

data = read(dq, seconds(1));

Plot Acquired Data

plot(data.Time, data.Board0_Ai0, data.Time, data.Board0_Ai1);
xlabel('Time (s)');
ylabel('Voltage (V)');

Change Default Properties of the Acquisition

By default, acquisitions run for one second at 1000 scans per second. To acquire at a different rate, change the Rate property.

dq.Rate = 10000;
[data, startTime] = read(dq, seconds(1));
plot(data.Time, data.Board0_Ai0, data.Time, data.Board0_Ai1);
xlabel('Time (s)');
ylabel('Voltage (V)');