Difference between revisions of "DAQ/Basic/Analog input and output using PCI 1711/English"
(Created page with ''''Title of script''': Analog input and output using PCI 1711 and Scilab in Linux '''Author: Rakhi ''' '''Keywords: Analog input, output, Scilab, PCI 1711''' {| style="borde…') |
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Latest revision as of 15:04, 15 February 2013
Title of script: Analog input and output using PCI 1711 and Scilab in Linux
Author: Rakhi
Keywords: Analog input, output, Scilab, PCI 1711
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| Show Slide 1 | Hello and welcome to the Spoken Tutorial on Analog input and output using PCI 1711 and Scilab in Linux. |
| Show Slide 2 | The objectives of this tutorial are:
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| Point 2 in Slide 2 | To acquire an analog input and display it |
| Point 3 in Slide 2 | To generate an analog output and measure it |
| Show Slide 3 | The pre-requisites for this tutorial are:
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| Point 2 in Slide 3 | Basic knowledge of Linux shell commands and |
| Point 3 in Slide 3 | Your PC is configured as per the Spoken tutorial on Installation and Configuration of PC/Laptop to use DAQ with Scilab |
| Show Slide 4 | The hardware used for this tutorial are:
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| Point 2 in Slide 4 | ADAM module 3968 SCSI 68P Terminal Board |
| Point 3 in Slide 4 | A variable voltage supply 0-5V and |
| Point 4 in Slide 4 | A multimeter |
| Point 5 in Slide 4 | Note that you need a PC with a PCI slot on the motherboard to practise this tutorial. |
| Show Slide 5 | To begin with, let us connect the hardware |
| Point 2 in Slide 5 | To do this, shut down your PC |
| Pont 3 in Slide 5 | Remove the side cover of the CPU |
| Point 4 in Slide 5 | Insert the PCI 1711 card into the PCI slot |
| Show Slide 6 | Here is how it will look like after inserting the card into the PCI slot |
| Show Slide 7 | Here is a much closer picture.
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| Show Slide 7 | Connect the cable and the Terminal board as shown in this picture |
| Show Slide 8 | Set 5 V in the voltage supply
Switch off the supply |
| Point 2 in Slide 8 | Connect the positive terminal of the supply to pin number 68 in the terminal board |
| Point 3 in Slide 8 | And the negative terminal to pin number 60 |
| Point 4 in Slide 8 | Now we have connected an analog input to channel 0 of the DAQ card
Switch ON your PC |
| Point 5 in Slide 8 | It is better to have a printout of the pinout details of the PCI card connector ready while practising this tutorial. |
| Open firefox and go to the URL:
Click on Datasheet and save the file. |
You can download the same from the Advantech website |
| Show Slide 9 | Let us now check if the card has been detected by the PC as a COMEDI device |
| Point 2 in Slide 9 | I am using Kernel 2.6.32-31 |
| Open the terminal and type:
Press Enter |
We can see that the PCI card has been recognised as device comedi0
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| Point 3 in Slide 9 | If your kernel version is older than 2.6.30, you have to first load the COMEDI module for the DAQ card |
| Open the terminal and type:
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This can de done by the command modprobe |
| Open the terminal and type:
Press Enter |
Now check if the card is detected as a COMEDI device using the dmesg command explained before
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| Point 4 in Slide 9 | I would like to remind you that your PC must be configured with all the software as per the Spoken tutorial on DAQ installation.
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| Point 5 in Slide 9 | Now let us use Scilab to read the analog input. |
| Open Scilab.
Click on Toolboxes and then click on hart_0.4.3. |
Open Scilab and load the HART toolbox |
| Open Xcos.
Click on Hart from the Pallette browser. Click on Comedi |
Open Xcos and go to the Hart comedi palette |
| Let us create a new Xcos diagram to acquire an analog input | |
| Choose hart_comedi_datain block from Hart comedi palette.
Place it on the new Xcos diagram. |
Place a hart_comedi_datain block from the comedi palette |
| Choose AFFICH_m block from Sinks palette and CLOCK_c from Sources palette.
Place them on the new Xcos diagram. |
Place an AFFICH_m block from the Sinks palette and a CLOCK_c block from the Sources palette |
| Xcos window | Connect them as shown |
| Right click on the comedi block and select Block help
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The hart comedi datain block (shown as COMEDI A/D) represents the comedi device.
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| Right click on comedi block.
Click on block parameters. |
Right click on the comedi block to set the parameters
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| Enter 0 in the field Channel | We have connected analog input to channel 0.
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| Enter comedi0 in the field Device | The device is recognised as comedi0.
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| Enter 0 in the fields Range and Aref
Press OK |
Give 0 for the fields Range and Aref |
| Double click on Clock block.
Set Period as 1 Set Init time as 0 Click OK |
You can set the clock period to say 1s and Initial time as 0
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| Go to the menu bar and click on Simulation .
Choose Setup. Set Final integration time as 1000 Set Real time scaling to 1 Click OK |
Set the simulation parameters by going to the Setup tab under simualtion.
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| Switch ON the voltage supply and start the simulation.
You can see 5 being displayed in the Affich block | |
| Vary the voltage supply | You can vary the supply voltage and see the corresponding variation in the display. |
| Show Slide 10 | Note that you should not give voltage input more than 10V to the PCI card |
| Point 2 in Slide 10 | You can connect the input to a different channel and repeat this experiment. |
| Show Slide 11 | Let us now learn to output an analog voltage through Scilab |
| Point 1 in Slide 11 | Let us output 5 V on analog output channel 0 of the device |
| Point 2 in Slide 11 | Note that you can only output 0 to 5V in this device |
| Open a new Xcos window | Let us create a new Xcos diagram for this. |
| Choose hart_comedi_dataout block from Hart comedi palette.
Place it on the new Xcos diagram. |
Place the block hart_comedi_dataout (shown as COMEDI D/A) from the hart comedi palette.
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| Choose CONST_m block and CLOCK_c from Sources palette.
Place them on the new Xcos diagram. |
Place a constant block and Clock block from Sources.
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| Right click on comedi block.
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Right click on the comedi block to set the parameters
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| Enter 0 in the field Channel | The channel is 0 |
| Enter comedi0 in the field Device | The device field has to be comedi0 |
| Enter 0 in the fields Range and Aref
Press OK |
Give 0 for the fields Range and Aref |
| Double click on Constant block.
Set constant as 5. Click OK |
Set 5 in the constant block |
| Double click on Clock block.
Set Period as 1. Set Init time as 0. Click OK |
You can set the clock period to say 1s and Initial time as 0
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| Go to the menu bar and click on Simulation .
Choose Setup. Set Final integration time as 1000 Set Real time scaling to 1 Click OK |
Set Final integration time to 1000s and real time scaling to 1
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| Press the Play button to start simulation | Start the simulation |
| Point 3 in Slide 11 | Check the output voltage using a multimeter. |
| Point 4 in Slide 11 | Place the positive probe on pin number 58 and negative probe on pin number 57 |
| Go to Xcos diagram.
Vary the constant value in the constant block |
You can vary the constant values and see the corresponding variation in the multimeter readings |
| Point 5 in Slide 11 | You can also repeat this experiment for channel 1 |
| Point 1 in Slide 11 | So in this tutorial, we have learnt how to :
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| Point 2 in Slide 12 | Generate an analog output using Scilab and measure it |
| Show Slide 13 | Spoken tutorial is a part of Talk to a Teacher project.
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| Point 2 in slide 13 | This is supported by National Mission on Education
through ICT, MHRD, Govt of India. |
| Point 3 in slide 13 | More information on this mission is available at : |
| Hope you found this tutorial useful.
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