WEBVTT 00:00.110 --> 00:00.530 All right. 00:00.530 --> 00:04.130 And let's finish this section with a servo motor. 00:04.130 --> 00:09.920 And just after that, we are going to practice with the Arduino components, the serial communication 00:09.920 --> 00:11.630 and the Raspberry Pi. 00:11.660 --> 00:14.720 So I'm going to add a servo here. 00:14.840 --> 00:16.970 So a micro servo. 00:17.000 --> 00:19.820 Okay, let's actually flip it. 00:21.040 --> 00:22.400 Like that. 00:22.420 --> 00:31.000 Okay, So on a classic hobby servo motor you will have here, you will see three different pins, okay? 00:31.060 --> 00:32.590 And three wires. 00:32.590 --> 00:38.020 So you will have a brown one, a red one and an orange one or something that is similar. 00:38.020 --> 00:41.110 So the brown one corresponds to the ground. 00:41.110 --> 00:47.230 So we are going to first connect the ground to the ground of the Arduino. 00:47.230 --> 00:50.470 So let's connect to the common ground here. 00:50.500 --> 00:54.340 Let's put that in black and then we have power. 00:54.460 --> 01:01.300 So power we can give five volt here and let's go here. 01:03.280 --> 01:05.610 That's going to be red. 01:05.630 --> 01:07.220 And then we have the signal. 01:07.220 --> 01:13.550 So the signal is basically to be connected to a digital pin. 01:13.550 --> 01:14.720 I'm going to use 12. 01:14.750 --> 01:23.780 So for this digital pin, you don't need any pin or any special pin, just any digital pin will do. 01:24.080 --> 01:26.420 And let's use a different color. 01:26.420 --> 01:28.430 Let's use brown. 01:29.860 --> 01:30.130 Okay. 01:30.130 --> 01:31.420 And that's it for the servo motor. 01:31.420 --> 01:34.180 But I'm going to explain you something a bit extra here. 01:34.180 --> 01:38.580 So here what you're doing is you're going to control the servo motor with PIN number 12. 01:38.590 --> 01:40.960 So that's going to give the command to the servo. 01:40.990 --> 01:42.550 But the servo is powered. 01:42.550 --> 01:42.870 Okay. 01:42.970 --> 01:43.990 From the Arduino. 01:43.990 --> 01:49.420 Also, the thing is that the servo motor, so if you use a hobby one, a standard one, it's completely 01:49.420 --> 01:49.870 fine. 01:49.870 --> 01:52.330 It's going to be powered on from the Arduino. 01:52.330 --> 01:52.750 Okay. 01:52.750 --> 01:53.980 That's obvious here. 01:53.980 --> 01:58.780 But the servo may draw more power than other components. 01:58.780 --> 02:06.070 So if you want to add multiple servers or give more strength to the servo, you may also want to add 02:06.070 --> 02:07.750 an external power supply. 02:07.750 --> 02:09.400 So I'm just going to show you. 02:09.670 --> 02:14.560 So I'm just going to use this nine volt battery here just as an example. 02:14.560 --> 02:19.030 So yours is not going to be that one that can be any other power supply. 02:19.060 --> 02:24.280 But basically what you can do is you can see when you have an external power supply, you have a negative 02:24.280 --> 02:25.330 and a positive. 02:25.330 --> 02:33.110 So let's actually connect these two to this side of the breadboard. 02:34.250 --> 02:38.510 Okay, So I'm going to put that in black and that in red. 02:38.960 --> 02:45.860 So now we have this side of the breadboard with the ground connected to the Arduino here, the line 02:45.860 --> 02:49.520 with five volts and now the other side here. 02:49.520 --> 02:53.540 So the, the piezo here is not in this. 02:53.540 --> 02:53.750 Okay? 02:53.750 --> 02:56.120 It's just on top, but it's just a visual. 02:56.420 --> 03:02.330 So you have another line with another ground and another plus line, which is this time the external 03:02.330 --> 03:03.200 power supply. 03:03.200 --> 03:09.800 And what you can do is that instead you can just power on the servo. 03:09.950 --> 03:11.660 So I'm just going to do this. 03:15.520 --> 03:22.360 So put the ground here and then the power supply is going to come from. 03:23.750 --> 03:24.350 The. 03:27.310 --> 03:29.110 External power supply. 03:30.290 --> 03:30.670 Okay. 03:30.670 --> 03:37.420 And one very important thing to do is to actually connect the grounds of everything, okay? 03:37.420 --> 03:42.520 Because if you don't connect the ground of everything, then the comment you're going to send here on 03:42.520 --> 03:44.380 PIN number 12 is not going to work. 03:44.410 --> 03:46.150 It's going to be some garbage comment. 03:46.150 --> 03:51.010 So you're going to connect the ground of this to the ground of the. 03:52.170 --> 03:52.560 Arduino. 03:52.560 --> 03:53.970 Make sure you connect the ground, okay. 03:53.970 --> 03:58.740 And not the ground to the VCC because you may have some problems. 03:59.680 --> 04:00.280 Okay. 04:00.990 --> 04:02.690 And now you have the same servomotor. 04:02.700 --> 04:10.210 You can give the same command, but it's externally powered by another battery or another power supply. 04:10.230 --> 04:12.210 So all the grounds are connected. 04:12.210 --> 04:14.610 Everything here is powered by the Arduino. 04:14.730 --> 04:16.950 The servo motor is powered by this. 04:17.100 --> 04:17.580 Okay. 04:17.580 --> 04:22.230 And then we still have the command from PIN number 12 that goes to the servo motor. 04:22.230 --> 04:29.730 And just one last thing is don't use PIN number 13 here on the Arduino Uno because PIN number 13 is 04:29.730 --> 04:32.430 also connected to the built in Led. 04:32.640 --> 04:39.000 And if you connect anything to that, well, you may have some unexpected behavior because this pin 04:39.000 --> 04:42.540 is going to be triggered automatically at some point. 04:42.540 --> 04:45.360 So just don't use the PIN number 13. 04:45.360 --> 04:51.660 So you can use PIN 2 to 12 on Arduino Uno because those ones are reserved. 04:51.690 --> 04:56.310 Better to reserve them for serial communication and this for the built in Led. 04:57.120 --> 04:57.540 All right. 04:57.540 --> 04:58.980 And that's it for the circuit. 05:00.060 --> 05:03.150 Then here is the real circuit with the servo motor. 05:03.180 --> 05:09.240 You can see here, I use a very small one and the gear is in a plastic here. 05:09.280 --> 05:13.180 Okay, that's very low quality one, but that's going to do for this course. 05:13.200 --> 05:19.170 That's basically the standard one, the cheapest you can find and maybe the one you have on your Arduino 05:19.170 --> 05:19.560 kit. 05:19.560 --> 05:25.770 And you can see I have some kind of stuff like this that I'm going to use on the servo for the final 05:25.770 --> 05:26.340 project. 05:26.340 --> 05:29.790 So you can see we have this wire here. 05:29.790 --> 05:37.800 So this cable with a brown, red and orange, So brown and red are connected here to ground and five 05:37.800 --> 05:38.970 volt of the Arduino. 05:39.000 --> 05:40.830 I'm not going to use an external power supply. 05:40.830 --> 05:43.200 I'm just going to power the servo from the Arduino. 05:43.230 --> 05:44.510 This is completely fine. 05:44.520 --> 05:44.760 Okay. 05:44.760 --> 05:46.740 For this circuit. 05:46.770 --> 05:52.530 It's just that if you want more servo or if you want to use that in a real application where you need 05:52.530 --> 05:54.780 to put a lot of torque. 05:54.810 --> 05:55.260 Okay. 05:55.260 --> 05:56.610 On the servo. 05:56.610 --> 05:58.200 So a lot of force on the servo. 05:58.230 --> 06:00.160 Maybe use an external power supply. 06:00.280 --> 06:07.720 So here I've just moved a bit the ground and the five volt line here on the right so I can put the servo 06:07.750 --> 06:08.770 here on the left. 06:08.950 --> 06:13.090 And then this is connected to PIN number 12. 06:13.390 --> 06:13.630 Okay. 06:13.630 --> 06:20.350 Just to show you, I have another servo so you can see that's completely different here about another 06:20.350 --> 06:20.740 one. 06:20.740 --> 06:23.170 And the gear here is in metal. 06:23.170 --> 06:27.790 And you can see when you buy a servo, usually you have stuff like this that comes with it. 06:27.820 --> 06:36.430 Okay, So you can just plug this to the servo so you can basically plug the servo to something mechanical, 06:36.430 --> 06:41.800 for example, a door mechanism or anything like a camera, anything that you want. 06:41.800 --> 06:47.950 So you can plug the servo here with the mechanical part with those tools here and you can see any hobby. 06:47.980 --> 06:50.200 Servo Well has the same. 06:50.320 --> 06:51.850 Okay, same connector. 06:51.850 --> 06:58.090 So I'm maybe going to use that one for the rest of the course, but that's the exact same servo.