WEBVTT 00:00.080 --> 00:04.190 Let's start with the hardware setup for serial communication. 00:04.190 --> 00:08.870 So you have your Raspberry Pi here and you can see it's already powered on for me. 00:08.900 --> 00:09.290 Okay. 00:09.290 --> 00:12.170 And you have your Arduino and the USB cable. 00:12.200 --> 00:19.390 So what you're simply going to do is connect the Arduino to the Raspberry Pi with the USB cable. 00:19.400 --> 00:25.400 As you can see, you can do that when the Raspberry Pi is powered on or powered off, it doesn't really 00:25.400 --> 00:26.040 matter. 00:26.060 --> 00:27.470 And that's pretty much it. 00:27.500 --> 00:32.060 Now, you can see also on the Arduino here, I'm going to unplug it here. 00:32.060 --> 00:35.450 You can see you have some pins here on the Arduino Uno. 00:35.480 --> 00:43.280 You have zero and one which are X and X, and those are also pins for serial communication. 00:43.280 --> 00:47.300 So you could use those eventually with some Gpio on the Raspberry Pi. 00:47.330 --> 00:49.940 But this is much more complex. 00:49.940 --> 00:50.180 Okay. 00:50.180 --> 00:54.800 You need a voltage level shifter between five volt and 3.3V. 00:54.830 --> 01:01.110 It's also less robust, less reliable and well, USB cables are really working well. 01:01.140 --> 01:01.410 Okay. 01:01.440 --> 01:05.270 I've never had any problem with serial communication that way. 01:05.280 --> 01:06.690 And one more thing is that. 01:06.690 --> 01:08.460 So here I have an Arduino Uno. 01:08.490 --> 01:11.160 You may have a different kind of board. 01:11.190 --> 01:11.490 Okay. 01:11.490 --> 01:15.120 And depending on the board, the USB connector here may be different. 01:15.120 --> 01:20.220 So here I have like a standard classic one, but you may have a micro USB. 01:20.490 --> 01:26.610 Well, it doesn't really matter as long as you can connect the USB connector here to the USB connector 01:26.640 --> 01:27.870 here on the Raspberry Pi. 01:27.900 --> 01:30.390 Everything is going to work correctly. 01:31.260 --> 01:37.110 Now that the hardware setup is down, let's do the software setup and for that you go to your Raspberry 01:37.110 --> 01:38.580 Pi desktop. 01:38.580 --> 01:44.100 So make sure, of course, that you have correctly plugged your Arduino board to the Raspberry Pi using 01:44.100 --> 01:45.360 the USB cable. 01:45.480 --> 01:48.900 And so for the Arduino side, there is nothing to do. 01:48.930 --> 01:56.280 Serial is already configured and ready to be used with the serial library on the Raspberry Pi board. 01:56.280 --> 01:59.100 We will need to do a few setup steps. 01:59.100 --> 02:03.180 So first of all, you can open a terminal here. 02:04.190 --> 02:16.130 I'll click on the terminal icon and do ls dash dev dash t and then this so we can list all of the stuff 02:16.130 --> 02:22.400 that starts with slash dev slash t, you press enter and you can see all of that. 02:22.400 --> 02:23.480 So what is this? 02:23.510 --> 02:29.630 Well, basically we are going to try to find the port of the Arduino on the Raspberry Pi. 02:29.660 --> 02:30.200 Okay. 02:30.380 --> 02:37.070 So the port is basically the name that is given to the port here so that we can recognize it and then 02:37.070 --> 02:38.660 we can connect to it. 02:38.780 --> 02:39.320 And. 02:39.320 --> 02:40.820 Well, you have quite a few. 02:41.360 --> 02:42.590 I'm going to give you the answer. 02:42.620 --> 02:44.030 The port is that one. 02:44.030 --> 02:44.240 Okay. 02:44.270 --> 02:47.300 Slash dev slash t ACM zero. 02:47.300 --> 02:49.340 So you should have something like this. 02:50.000 --> 02:56.060 ACM or USB depends with a number that can be 0 or 1. 02:56.090 --> 02:58.970 Well, usually you will start with this. 02:59.000 --> 03:02.330 Now how to be sure you have this port. 03:02.360 --> 03:05.820 Well, you simply disconnect your Arduino. 03:05.820 --> 03:08.940 So I just unplugged my Arduino board. 03:08.970 --> 03:09.530 Okay. 03:09.540 --> 03:14.130 I just unplugged the USB cable and now I'm going to run this command again. 03:15.470 --> 03:22.250 And you can see that here we don't have the T zero anymore. 03:22.700 --> 03:25.250 I'm going to replug the Arduino. 03:25.730 --> 03:27.140 The Arduino is plugged. 03:27.740 --> 03:28.610 I run the command. 03:28.610 --> 03:30.260 You can see now we have this. 03:30.260 --> 03:35.360 So basically, you just disconnect your Arduino, you run that command, you connect your Arduino, 03:35.360 --> 03:38.980 and you just find what is the new port that is here. 03:38.990 --> 03:41.330 So now we know that this is the name of the port. 03:41.360 --> 03:46.850 What you could also do is if you have the Arduino IDE installed. 03:49.180 --> 03:49.450 Okay. 03:49.450 --> 03:55.680 You can see here on Tools and Port, we can find also the same name. 03:55.690 --> 03:56.410 All right. 03:58.870 --> 04:00.270 So now we have the port. 04:00.280 --> 04:02.380 I'm going to do clear on the terminal. 04:02.410 --> 04:08.860 The second step we need to do is to make sure that our user so the Pi user, which is here, you can 04:08.860 --> 04:13.780 see, has the permission to access to serial communication. 04:14.050 --> 04:18.430 So we are going to do groups to see all the groups we are in. 04:18.430 --> 04:18.700 Okay. 04:18.700 --> 04:26.290 So as the Pi user, you can see we are already in the dial out group and this is the one that gives 04:26.290 --> 04:28.660 you access to serial communication. 04:28.660 --> 04:33.310 So if you don't have this when you type groups, so what you can do is sudo. 04:34.720 --> 04:37.690 Add user and then the name of your user. 04:37.690 --> 04:41.110 So here it's Pi and the name of the group. 04:41.350 --> 04:46.780 You press enter and you can see here the user Pi is already a member of dial out. 04:46.780 --> 04:51.370 But if it was not the case, it would add you to dialogue group. 04:51.790 --> 04:52.030 Okay. 04:52.030 --> 04:56.320 If you just added your user to the dialogue, you need to log out and log in. 04:56.320 --> 05:01.030 So what you can do is log out, log in, or you can also reboot your Raspberry Pi so you can be sure. 05:01.060 --> 05:01.480 All right. 05:01.480 --> 05:02.770 That was the second step. 05:02.770 --> 05:07.030 The third step is to install a python library. 05:07.150 --> 05:12.760 So on the Arduino side, we have the C plus plus library called soil, which is already installed on 05:12.760 --> 05:13.330 the Arduino. 05:13.330 --> 05:20.950 But on the Raspberry Pi side, we need a python module and this python module is pi soil. 05:20.980 --> 05:21.220 Okay. 05:21.220 --> 05:24.910 So we are going to use the Pi serial module and to install it. 05:24.910 --> 05:27.520 So first make sure you have pip3. 05:27.550 --> 05:35.150 So if you don't have pip3 sudo apt install python three dash pip. 05:37.110 --> 05:37.410 Okay. 05:37.410 --> 05:38.550 It's already here. 05:38.550 --> 05:45.150 And then pip3 install py serial like that. 05:45.180 --> 05:45.720 Okay. 05:45.930 --> 05:47.220 Press enter. 05:49.230 --> 05:50.730 And already installed. 05:50.730 --> 05:54.960 So actually it may already be installed on your Raspberry Pi. 05:54.990 --> 05:57.120 So if that's the case, that's wonderful. 05:57.120 --> 06:02.050 And then you can do Pip3 show pi serial. 06:02.500 --> 06:02.880 Okay. 06:04.380 --> 06:10.150 To see the version, to see more details and maybe the page with documentation and everything. 06:10.170 --> 06:12.420 For this library. 06:12.540 --> 06:14.400 And that's pretty much it. 06:14.550 --> 06:15.300 Okay, great. 06:15.300 --> 06:17.790 So now everything is correctly set up. 06:17.820 --> 06:21.900 The Arduino board is plugged to the Raspberry Pi with the USB cable. 06:21.930 --> 06:28.650 You have the correct permission on the Raspberry Pi and you also have a serial library ready to be used 06:28.650 --> 06:30.340 on both sides. 06:30.360 --> 06:33.000 Let's now initiate the communication.