Name: ArduinoのPIRセンサー（HC-SR501 (PIR Sensor on Arduino (HC-SR501))
Uploaded: 2021-01-14T10:44:03.000Z
Duration: 10 min 10 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

please go to the line the computer guy dot com In order to view schematics, code and Maur for the projects that you are learning about, welcome back.

So in today's a video, I'm going to show you how to connect a p i.

R a passive infrared sensor to an Arduino and be able to measure when it detects motion.

Sensors, these air generally called motion detection sensors in the real world.

And so basically, these sensors are a lot like the automatic lights security lights that you may have in your house.

So maybe on your garage or in your backyard, you have some big flood lights.

And under the flood lights is a little motion detector.

R sensor in order to detect movement within its range.

And then we can then trigger the art we know to do something.

So today, all we're going to be doing is we're going to be connecting the P I R sensor to the yard.

We know, and then we're going to be detecting when it sees motion and then simply printing out to the serial monitor that it sees motion.

So with that, let's go over the work, bitch.

So I can show you how to connect this to an Arduino, that I can show you the code and see how it all comes together.

Sensor and this is connected to our standard.

You know, board and we don't have anything else connected because we're simply going be printing out the results to serial monitor.

Now, when you're sitting here looking at this, you may run into a problem where you're not sure where the wires should go.

But then you may be asking yourself, I don't know where the sensor wire plugs and to the P I.

Well, all you have to do is actually just pop off this little housing here.

And if you pop off the little housing on this particular unit, you can see that ground is over here to the left, the output.

That's what we'll go to the digital pin is in the middle and then VCC is over to the right.

And then other times, basically all you have to do is peel off the cover and you'll see Okay, ground is to the left.

The sensor output is in the sensor in the center and in the V C.

We got plugged into five old we gotta plug it into ground, and then we have the censor censor pen and that is plugged into digital pen number eight on this are you know, and that's all you have to dio to assemble this particular project.

The first thing that we have to do is define the sensor pennants we're going to do pound and define.

And then I'm just simply going to call a p I R Sensor and attack that to digital pin number eight.

Then we're going to need a variable for the readings.

So basically, we're going to take a reading off of the P I.

So we're going to create a variable call reading, and that is simply going to be an end.

Then we're going to go down and we're going to set up the environment.

So the first thing that we're going to do to set up the environment is we're going to use PIN mode.

We're gonna call P I R Sensor and we're going to set it to input.

Remember, whenever you're dealing with digital pens, it can be input or output output sends energy out.

So we need to make sure that's that input.

And then, of course, we're going to do cereal that began at 9600.

So this starts the serial monitor so that we can receive an output from the Arduino.

We're simply going to go into the loop, and this is all the code we have.

So that reading a variable that were created, we're going to set the value of that to digital read function.

We're going to read what is coming in on the P I r Sensor so way bring in what's coming in on the P I.

R Sensor and we're going to set that value to the variable reading.

Then we're going to go down and we're simply going to do and if else statement.

And then we have equal equal signs so equals Hi.

So, basically, if the reading coming in from the minute motion detector is high, then we're going to serial dot print line.

We're simply going to say motion, so it's gonna print on a line motion and then go to the next line else.

So basically, if the reading is anything else, which would be a low, we're simply going to serial parent line zero.

So what'll happen is basically we're see.

We're seeing the stream go across a serial monitor when there's emotion.

Then we'll see that there's emotion, and then when there's not emotion, then it will go back to zero.

So this will give us kind of kind of a visual way of understanding when there's emotion and when there's not.

Now it is important, understand when you're using the P I.

Sensors that you've only got high or low as faras.

So a lot of the other sensors, when you're talking about the the ultrasonic, distant sensors, sometimes the infrared sensors you can actually bring in an analog value so you can get a variable so you can figure out like how far away something is.

You can get a little bit more information out of it.

R Sensor is that either detects motion or doesn't detect motion.

That's something that you have to be thinking about with your projects is it's a very, very crude sensor.

And so that may be good and things like turning on floodlights something like that.

But in other operations, you maybe you may want something that's a little bit more accurate, something that you can refine a little bit more.

So let me upload this code into the yard.

No, I've uploaded the code, and I've also let the motion sensor, the P I.

R Sensors is many times it actually takes a little while for their circuitry to warm up for them to do what they're supposed to.

So I would say, Whenever you're doing these projects, let the sensor warmup for atleast a minute before you start troubleshooting problems with your code.

Ultrasonic sensors, infrared sensors, literally.

As soon as you plug them in, upload the code and they're working at No problem with P.