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Hello. In this video tutorial today we

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are going to learn how to control

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a temperature sensor with the arduino board

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okay we have our board and the

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first thing we need is a temperature

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sensor

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you will find it in the library

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the basic components library down here

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there it is so click and drag

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like always onto the protoboard

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and this temperature sensor has three connectors

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the first one has to be connected

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to five volts the third one or

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the other one on the end is

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connected to the ground using the black

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wire to the ground connector on the

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arduino board

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and the second one or this one

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in the middle is going to be

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connected to analog input a zero for

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instance like today and it's the one

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that's going to read the voltage from

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the sensor and the arduino board will

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read the temperature using this wire and

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this voltage

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so the connection is really easy but

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how do we program it

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so let's open the code

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and for now just forget about the

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second part the important thing here is

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this purple one this one is a

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specific input for a temperature sensor and

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what it means is that we are

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reading from this connector we can read

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from a one a two a three

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a four or a five and we're

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choosing a zero

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just for this example

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and the unit we want is degrees

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in Celsius

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so the moment we have this block

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we can store the reading in a

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variable called temperature and then we can

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send it to the serial monitor using

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the block we have already used in

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several other exercises

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so the connection and the programming are

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both very simple now let's look at

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the simulation

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so if I start the simulation

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nothing happens at first but the reading

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is here in the serial monitor

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right now the sensor is reading twenty

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four degrees why because if we click

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on the sensor

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this bar will appear and we can

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decide what the temperature it is reading

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from outside

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so if we go up to forty

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nine here then that means the arduino

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board will read forty nine in the

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monitor

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we go up to seventy six or

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seventy eight then the board will read

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the same seventy eight so the simulation

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works your exercise will be a little

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bit more complicated but just a little

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bit I'm going to show you the

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program in real life

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so here's the program and I have

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my arduino board here and the temperature

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sensor

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is over here it's very small over

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here so it's hard to see but

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we're reading it now you can see

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the measurements here in the serial monitor

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right now it says the room is

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twenty two degrees

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now if I touch it with my

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fingers

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the temperature will rise will go up

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that makes sense

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now it's reading twenty four so the

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device is working

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now I've had to make a modification

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because this reading is slightly different if

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we have a look at the text

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taken from the code on the computer

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let me show you the text

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this line here is different temperature equals

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minus forty plus number multiply by analog

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read minus twenty this line is not

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the same as this one here now

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this is because I have a different

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temperature sensor but it's not a problem

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because if you look for information

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can you look up the type for

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instance and the sensor I'm using is

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the l m thirty five so if

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I look this up online I will

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find how to connect it and I

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will find out how to read it

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using the arduino board

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all the information is here so this

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is the only line that i have

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modified now there's another modification too because

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I have added something to control a

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buzzer do remember

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now the buzzer is over here

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on my screen this is the buzzer

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and if you remember the buzzer makes

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sound you already know how to program

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it and if you don't remember you

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can go back to the exercise when

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we used it

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so we have a specific output just

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to remind you there's a specific output

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in the library so let me take

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you back to the output library

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we have a block here

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we use this block and then a

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wait block so you can control the

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buzzer

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now back to my real circuit so

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I have the arduino board here

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I have a buzzer

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and I have my temperature sensor here

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so let's have a look at how

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my sensor works

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right now we're reading twenty two

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if I touch it like before

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the temperature will rise

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and I've programmed the circuit so that

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if the temperature is higher than twenty

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five the buzzer will produce sound so

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I will touch it twenty twenty two

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twenty three twenty four twenty five twenty

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six

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do you have

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can you hear it?

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the buzzer okay so my circuit is

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working now if I remove my hand

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from the device the moment the temperature

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becomes lower it doesn't buzz anymore so

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this is the exercise you will have

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to program using the simulator you only

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need to click and drag the buzzer

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you need to connect it to ground

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and to one of the digital devices

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and using this block for sound and

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the weight block remember adding them together

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here

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and you will also need the condition

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the conditional the if block if and

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a temperature so for example if the

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temperature is higher than twenty five or

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fifty or whatever you want

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then the buzzer will produce sound now

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you should already know all the blocks

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you need and your simulation will work

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the same way my real circuit has

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worked so think about how to program

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this and good luck