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LO
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how to split in subplot real time analog input monitoring (scope)

Asked by LO
on 12 Jul 2018
Hi, I have this script which I am trying to use to visualize data input from multiple analog channels (from 2 niDAQ USB 6211 devices, 16 channels in total). I would like to visualize channels separately at least for the two DAQs (best would be to be able to set groups). Thanks for your help
clear, clc, close all; daq.reset; %% Create Data Acquisition Session % Create a session for the specified vendor. s = daq.createSession('ni');
%% Set Session Properties % Set properties that are not using default values. s.Rate = 20000; s.IsContinuous = true; n_channels = 16
%% Add Channels to Session % Add channels and set channel properties, if any. addAnalogInputChannel(s,'Dev1','ai0','Voltage'); addAnalogInputChannel(s,'Dev1','ai1','Voltage'); addAnalogInputChannel(s,'Dev1','ai2','Voltage'); addAnalogInputChannel(s,'Dev1','ai3','Voltage'); addAnalogInputChannel(s,'Dev1','ai4','Voltage'); addAnalogInputChannel(s,'Dev1','ai5','Voltage'); addAnalogInputChannel(s,'Dev1','ai6','Voltage'); addAnalogInputChannel(s,'Dev1','ai7','Voltage'); addAnalogInputChannel(s,'Dev2','ai0','Voltage'); addAnalogInputChannel(s,'Dev2','ai1','Voltage'); addAnalogInputChannel(s,'Dev2','ai2','Voltage'); addAnalogInputChannel(s,'Dev2','ai3','Voltage'); addAnalogInputChannel(s,'Dev2','ai4','Voltage'); addAnalogInputChannel(s,'Dev2','ai5','Voltage'); addAnalogInputChannel(s,'Dev2','ai6','Voltage'); addAnalogInputChannel(s,'Dev2','ai7','Voltage');
%% Initialize Session UserData Property % Initialize the custom fields for managing the acquired data across callbacks. s.UserData.Data = []; s.UserData.TimeStamps = []; s.UserData.StartTime = [];
%% Add Listeners % Add listeners to session for available data and error events. lh1 = addlistener(s, 'DataAvailable', @recordData); lh2 = addlistener(s, 'ErrorOccurred', @(~,eventData) disp(getReport(eventData.Error)));
%% Acquire Data % Start the session in the background. startBackground(s) pause(5) % Increase or decrease the pause duration to fit your needs. stop(s)
%% Log Data % Convert the acquired data and timestamps to a timetable in a workspace variable. ai0 = s.UserData.Data(:,1); ai1 = s.UserData.Data(:,2); ai2 = s.UserData.Data(:,3); ai3 = s.UserData.Data(:,4); ai4 = s.UserData.Data(:,5); ai5 = s.UserData.Data(:,6); ai6 = s.UserData.Data(:,7); ai7 = s.UserData.Data(:,8); ai8 = s.UserData.Data(:,9); ai9 = s.UserData.Data(:,10); ai10 = s.UserData.Data(:,11); ai11 = s.UserData.Data(:,12); ai12 = s.UserData.Data(:,13); ai13 = s.UserData.Data(:,14); ai14 = s.UserData.Data(:,15); ai15 = s.UserData.Data(:,16); DAQ_1 = timetable(seconds(s.UserData.TimeStamps),ai0,ai1,ai2,ai3,ai4,ai5,ai6,ai7); DAQ_2 = timetable(seconds(s.UserData.TimeStamps),ai8,ai9,ai10,ai11,ai12,ai13,ai14,ai15);
%% Clean Up % Remove event listeners and clear the session and channels, if any. delete(lh1) delete(lh2) clear s lh1 lh2
%% Callback Function % Define the callback function for the 'DataAvailable' event. function recordData(src, DAQ_1) src.UserData.Data = [src.UserData.Data; DAQ_1.Data]; src.UserData.TimeStamps = [src.UserData.TimeStamps; DAQ_1.TimeStamps];
if isempty(src.UserData.StartTime) src.UserData.StartTime = DAQ_1.TriggerTime; end
plot(DAQ_1.TimeStamps, DAQ_1.Data)
subplot(2,1,2)
plot(DAQ_2.TimeStamps, DAQ_2.Data)
xlabel('Time (s)')
ylabel('Amplitude (V)')
legend('ai0','ai1','ai2','ai3','ai4','ai5','ai6','ai7','ai8','ai9','ai10','ai11','ai12','ai13','ai14','ai15')
end

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