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Hello, friends.

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In today's lecture, I just show you how to control your AC appliances with the help of relay.

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And over here as a controller, I am using any USB 6001 DAC card and software.

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I am using Matlab and the input device over here is capacitive touch sensor.

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This is nearly same video as in my IR sensor and relay connections in my previous video as we see how

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to control the relay using IR sensor.

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So now I just change the only.

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There is a change in only in the sensor.

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So as you see this is my capacitive touch sensor This module have three pins.

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One is ground, one is VCC, one is signal that when I just put my hand over it, it will generate a

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signal, otherwise it will generate zero.

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So I am using digital pin for signal acquisition over here.

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This is my VCC.

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This one pin goes to over here to this sensor this capacitive touch sensor.

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One ground is connected and the blue one is my signal.

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That is from the touch sensor.

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On the other hand I am using analog output pin over here.

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I am using A0 zero to control the relay.

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Again, in the case of relay we have three pins, one is VCC, one is ground, one is signal pin that

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it requires to control the appliance.

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Over here on the output side in the relay we have three pins.

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One is normally open.

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This is normally open normally closed.

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This is phase.

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so one.

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This is my main AC in India.

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We have 220.

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So one wire goes to the holder, another wire goes to the face.

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Then this is the wire from main AC and I just use another wire.

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I just connect with the holder.

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Another pin as you see over here.

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Another wire to the end.

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This end and this wire goes to my normally closed pin.

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So over here when it is when relay is working, it just make a connection for this to this main AC face

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over here.

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Let's say this is my ground right now.

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This is my face.

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And this face just goes through from here to normally closed pin when it is closed.

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To this end, this bulb gets powered up.

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Okay, so right now I just go to the software part again.

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In this case I am just using digital input pin.

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I am using a port zero line one pin over here.

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Then I use a switch.

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And over here I am just using analog output.

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Just run it.

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Check.

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Let's check what happened when I just put my hand over the touch sensor.

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As you see.

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Turn on, turn off, turn on, turn off, turn on, turn off.

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Let's check what happened to it when I just put one, two, three over here.

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So just stop it.

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I just put one over here.

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Apply it.

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Okay.

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Run it.

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Let's check what happened to it.

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Initially it is on because threshold value is one over here.

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So I need to put two over here.

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Let's say.

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Or you can just change the threshold value.

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In this case let's say I just put threshold value 0.5.

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Let's check what happened.

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Again I just run it.

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Still it is in on condition.

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Stop it.

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Just put two over here.

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Run it

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Still it is in on condition.

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Let's put.

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Five.

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Over here.

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Now let's check what happened.

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Again.

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Run it!

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Now it is working.

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Let's do it for four.

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As you see right now, it is working.

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When your program is running this signal, acquisition and generation works.

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If your program stops, let's say I just stop my program, and then I just put my hand over it.

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It is not working because data acquisition and generation are Not happened in this case.

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

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What happened to it?

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Run it.

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It is continuous on, but some delay is there.

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So to control the relay you require a five volt signal.

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That's why I put over here five.

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So I just put five over here.

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In this case it is working as you see.

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Okay.

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So this is all about today's lecture how to control your AC appliance with touch sensor with the help

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of relay and Knee tech card and software as a Matlab.

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Thank you