WEBVTT

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And it's time for a new activity so you can practice with the new Pir sensor you have added to your

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circuit.

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And this activity will, if you manage to successfully do the previous ones, this activity is going

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to be quite easy.

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So what do we want to do?

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We want to do an automatic lighting control.

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Or it could be an alarm system.

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Well basically we want to turn on the LED if there is movement.

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So the LED whichever LED for example the first one we're going to turn on that LED if a movement is

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detected and turned off if no movement is detected okay.

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So it should be quite easy.

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You will need to import the different modules, initialize the components, and then find a way to do

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that.

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And that's the first part.

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As the second part we're going to do an improvement with the code because I'm going to give you a new

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function okay.

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To use as a challenge to try to use this new function.

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So what you have seen for now is that let's say we have initialized a Pir variable here.

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You can do Pir dot motion detected.

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Okay.

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This is going to give you true or false.

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But then there is something else that you can do.

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So in the code if you remember with the button we had something like button dot when pressed.

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Okay.

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And you would register a callback function.

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Well you have the same thing for the pi you can do pi r dot when motion like this.

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And pi r dot when no motion.

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Okay.

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So quite explicit.

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If a motion is detected then you can register a callback function.

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If you are not sure about callback function, please go back to the section where we plug the plus button.

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And then we do the activities.

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I explained all that in those activities.

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So basically when motion is detected you can give a function.

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So my for example you have defined a function my function.

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And make sure to not put any parentheses okay.

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And you can do the same with no motion.

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So when you do this you will also need to pause the execution after because it's just going to register

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a function to call later when this is happening.

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So I don't give you any more information right now.

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It's your time to practice and I will see you in the next video for the solution.