“Getting Familiar with Lab view & Speedy-33”

Introduction:

The hardware used in this lab is speedy-33 DSP Board and the software support the hardware is Lab View 8.6.

Lab View Main Tasks:

                                           

• Instrument Simulation of real world
• Data Acquisition
• Data Analysis
• Data Manipulation
• Hardware Interaction

  

• The First Step is to connect the speedy-33 device with PC and then we launched lab view two windows opened block diagram window and a front panel
• In the control panel >control pallet>switches>toggling switch>right click>properties>change the name>Boolean>toggling switch>indicator>Indicator>LED>label changed>properties>LED name >OK.
• In the block diagram we implement the circuit and then we saved it and then we clicked on the RUN button and it run one time, for continuously running a while loop is used.

Implementing an LED blinking circuit:

Goal is to ADC & DAC:

Implementation:

We launched Lab View8.6>target>DSP project>next>next>Target Type>Speedy-33>Finish by click on finish two windows opened Block Diagram and Front Panel

• Block diagram>Right Click>elementary I/o’s>analog>input>right click>properties>sample rate=48000>gain=4>analog output>properties>and the save it>run>preparing to download.

For continuous running a while loop is used which can be applied as block diagram/view/function pallet/structure/while loop/save/run

• Now the turn for Front panel to be used, right click on front panel>graph>wave form graph>block diagram>connect with input.
• As shown in snapshots.

                                   

 

 

Variable gain and fixed sampling rate=48000

Gain= 10, Sampling rate= 48000

Gain= 4, Sampling rate= 48000     

   Gain= 1, Sampling rate =48

 

Comment:

It is clear from the above graphs that by changing gain while setting the sampling rate same the amplitude changes randomly at every point so gain effects frequency.

 

2^nd signal with variable sampling rate and sampling frequency=36000

Fs=36000, gain=1

Fs=36000, sampling rate=256, gain=1

Fs=36000,sampling rate=1024,gain=1

                                

Comment:

By changing sampling rate we are approaching towards original signal which is sampled.