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In today's lecture, I will just show you how to control a DC motor using National instruments.

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Dec 6001 with the help of Matlab.

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So first how to interface this Dec card.

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I already told you in my previous videos in today's lecture I just use as you see analog output pin

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A0 to control the motor.

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So right now one is ground, one is positive signal that is A0 zero.

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So Now I just go to the software part over here.

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I just drag analog output, double click over here.

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I just select analog output zero and apply it.

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Okay.

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Now I just need a constant value.

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How much value I need to send to the outer world through this analog output.

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So just connect it.

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Let's check what happened to it.

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Right now it is in infinite running phase.

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As you see over here time goes.

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But motor is not running.

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So let's say I just put over here three ply still.

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Now I just put five five volt signal to the outer world.

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It is not running.

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Let's say six.

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Still, it is not running.

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This is the problem because in the datasheet of this DAC card, it is not providing sufficient current

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to run this motor.

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Okay.

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Or you can say minimum torque is not provided by the current.

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So minimum current requirement to provide to fill up the minimum current requirement.

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We just use Darlington pair over here.

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I just use a transistor.

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Step.

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This is where I just tell you the number.

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It is Bc547.

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It is bc547.

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As you see over here, I just use two transistors.

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These are connected in Darlington pair.

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So to run this particular motor I just use this ground.

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Ground is over here.

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Now I just put VCC to the collector.

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As you see over here collector is given.

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Now I just need to put value zero over here initially in the software part.

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So this is the output signal I just give it to the base.

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And over here this is my signal for the motor I just connect It to the over here.

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Let's check what happened now.

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I just put three.

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As you see, motor is running in this case because using this we just amplify the current.

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And this current goes to the motor which will provide sufficient torque to the motor.

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So let's say I just put over here two.

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Right now it is running in less speed.

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As you see.

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Let's say I just put 1.5 over here.

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Now it is stopped okay.

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So again I just put let's say 2.5.

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It is running.

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1.9 let's check.

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Still it is running with very less speed.

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As you see I just show you over here.

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Running speed of this motor.

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Now it is stopped.

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Maybe lose connections.

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So let's say it is.

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I put three over here.

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Right now it is running.

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When you put four over here, basically when you put three over here, you provide three volt signal.

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Now I just put four.

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Speed is high in this case.

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Again I just put let's say.

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Five over here.

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More speed is there.

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Okay.

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So this is how you can control the speed of this DC motor using any USB 6001 deck card.

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Thank you