How to detect and send digital I/O using matlab? (not simulink)

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Kelly 2013-12-5

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评论： Kelly 2013-12-12

How to use matlab to detect and generate digital input output form a NiDAQ using matlab?

I do not want to use simulink. Is that even possible? I have a sensor and a LED light. When I put my figure near the sensor the LED turn on, when I let go the LED will go off. IS that even possible in Matlab? I believe matlab don't run things continuously.

e.g while (true) If detect digital signal iniput from port 0 line 0 (Sensor) pause(.1) send digital signal output to port 0 line 1 (LED) pause(.1) send the inverse siganl to port 0 line 1 (turn off LED) end

end

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回答（2 个）

Walter Roberson 2013-12-5

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You already asked that three times before. Search the documentation for DIO

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Kelly 2013-12-10

编辑：Kelly 2013-12-10

在 MATLAB Online 中打开

er... I was given this http://sine.ni.com/nips/cds/view/p/lang/en/nid/10971 It is also selling in ebay for 185 http://www.ebay.com/itm/like/300920221791?lpid=82

I have daqmx 9.2.2 installed. I can turn on the lights when that program. Therefore it prove the daqmx is correctly connected to the computer.

When I try the following i get this.

    % code
DIO = digitalio('nidaq','Dev1')

Error using digitalio (line 117) Failure to find requested data acquisition device: nidaqmx.

Also In the daqmx, the device is indicated as NI PCI/PXI-6221 (68-pin).

Lastly, I tried the session base code. It works

% code
s = daq.createSession('ni');
s =

Data acquisition session using National Instruments hardware: Will run for 1 second (1000 scans) at 1000 scans/second. No channels have been added.

Properties, Methods, Events

However, the problem is the fact that I am more familiar with legacy base's codes. I am really clueless on how to send digital output and detect digital input with session base program. Also could anyone care to explain what session base means?

    % code
 ni: National Instruments PCI-6221 (Device ID: 'Dev2')
   Analog input subsystem supports:
      4 ranges supported
      Rates from 0.1 to 250000.0 scans/sec
      16 channels ('ai0' - 'ai15')
      'Voltage' measurement type
   Analog output subsystem supports:
      -10 to +10 Volts range
      Rates from 0.1 to 833333.3 scans/sec
      2 channels ('ao0','ao1')
      'Voltage' measurement type
   Digital subsystem supports:
      Rates from 0.1 to 1000000.0 scans/sec
      24 channels ('port0/line0' - 'port2/line7')
      'InputOnly','OutputOnly','Bidirectional' measurement types
   Counter input subsystem supports:
      Rates from 0.1 to 80000000.0 scans/sec
      2 channels ('ctr0','ctr1')
      'EdgeCount','PulseWidth','Frequency','Position' measurement types
   Counter output subsystem supports:
      Rates from 0.1 to 80000000.0 scans/sec
      2 channels ('ctr0','ctr1')
      'PulseGeneration' measurement type

Walter Roberson 2013-12-11

Legacy interface instead of Session-based interface should be fine. You will need at least R2011b for the session-based interface for that device, and I see noted some bugs for support of the device before R2011b (but I did not cross-check which interface that was for.)

Beyond that I will need to research more.

Kelly 2013-12-12

在 MATLAB Online 中打开

DIO = digitalio('nidaq','Dev1')

Error using digitalio (line 117) Failure to find requested data acquisition device: nidaqmx.

The legacy interface isn't working probably, but it doesn't matter to me anyways. I just want it to work. So to the question. how to do the following with session base interface?

    % code
If (digital output at port 0 line 1 == True) % sensor detection
       send digital output to port 0 line 2; turn on led
       send an inverse output to port 0 line 2; turn off led
end