WEBVTT 00:00.080 --> 00:04.460 This is the two of the final project of the intercom system. 00:04.610 --> 00:08.840 And in this step, we are going to start to write the Arduino code. 00:08.870 --> 00:14.690 I'm going to write the Arduino code in three steps, first to initialize all the components and then 00:14.690 --> 00:16.250 to focus on the output. 00:16.250 --> 00:20.780 So what we send from the Arduino to the Raspberry Pi. 00:20.810 --> 00:24.020 And the third step would be to focus on the input command. 00:24.020 --> 00:29.600 So basically what we receive from the Raspberry Pi and apply those commands to the hardware we have 00:29.600 --> 00:31.260 previously initialized. 00:31.280 --> 00:32.960 I'm doing it this way. 00:32.990 --> 00:33.350 Why? 00:33.380 --> 00:37.790 Because well, we already have all the hardware components plugged to the Arduino on the circuit. 00:37.820 --> 00:40.940 We know it's working because we already have tested them. 00:41.120 --> 00:48.650 And also in this project, well, there is no relation between all the components in the Arduino program. 00:48.680 --> 00:51.820 Only the Raspberry Pi will know how to combine them. 00:51.830 --> 00:52.080 Okay. 00:52.190 --> 00:59.910 When to power on the when to give some text to the LCD screen, when to ask to open the door, etcetera. 00:59.910 --> 01:02.220 But the Arduino doesn't know any of that. 01:02.220 --> 01:09.540 The Arduino just sends output messages and receives input commands and execute them independently for 01:09.540 --> 01:10.350 each component. 01:10.350 --> 01:12.930 So that's why I'm going with this order. 01:12.930 --> 01:18.210 What you could also do and which is also a valid option, is to do the steps. 01:18.210 --> 01:20.580 So one step for each component. 01:20.610 --> 01:26.040 For example, if you were to start the circuit from scratch, you could add a component to the circuit 01:26.070 --> 01:32.580 on the Arduino, test this component and add this component into the Arduino program until you have 01:32.580 --> 01:36.030 tested and added all the components one by one. 01:36.360 --> 01:37.980 All right, so now let's start. 01:37.980 --> 01:44.670 And here in this step, I'm going to just initialize all the components and print something on the LCD 01:44.670 --> 01:49.950 screen, like a starting message to just know that we have started the application. 01:50.130 --> 01:56.280 Also, for each step, I'm going to save the project as a different file with the name of the step so 01:56.280 --> 02:01.100 you can just download each program for each step independently. 02:01.100 --> 02:02.570 All right, let's start. 02:03.080 --> 02:06.140 So first I'm going to include the libraries we need. 02:06.560 --> 02:13.160 And so for RGB, the buzzer and the push button, we don't need anything, but we need something for 02:13.160 --> 02:14.390 the liquid crystal. 02:14.720 --> 02:25.790 So liquid crystal dot h and include several dot h. 02:26.450 --> 02:26.870 All right. 02:26.870 --> 02:28.730 We have all the libraries we need. 02:28.730 --> 02:33.140 And then I'm going to do a define for each of the pin. 02:33.410 --> 02:45.350 So RGB, let's start with RGB red pin, which is PIN number 11 and then RGB green pin, which is number 02:45.350 --> 02:46.070 ten. 02:46.070 --> 02:46.310 Okay. 02:46.310 --> 02:51.230 In this project here in the solution of this project, I'm going to write all the code from scratch. 02:51.740 --> 02:57.200 Define RGB blue pin, which is nine. 02:57.230 --> 02:59.420 Okay, We have the RGB. 02:59.420 --> 03:01.070 Let's do the buzzer. 03:01.100 --> 03:12.510 Define on buzzer pin, which is pin eight, and then define button pin, which is pin seven. 03:12.510 --> 03:12.720 Okay. 03:12.720 --> 03:13.980 There is no order for this. 03:13.980 --> 03:16.950 We just do all the defined then. 03:16.950 --> 03:18.570 Well, let's add the servo here. 03:18.600 --> 03:23.040 Define servo pin 12. 03:23.430 --> 03:27.360 We have the servo RGB buzzer button and then we need the LCD. 03:27.360 --> 03:45.210 So LCD is PIN A4 and then define LCD E pin, which is A5 and we have four more with LCD for PIN, which 03:45.210 --> 03:46.620 is number two. 03:47.220 --> 03:50.640 Let's just copy this three more times. 03:51.990 --> 03:56.280 The five D, six, D seven. 03:57.850 --> 04:01.480 And we have two, three, four and five. 04:01.510 --> 04:01.690 Okay. 04:01.690 --> 04:04.450 Make sure you have the correct defines. 04:04.630 --> 04:08.470 That's going to save you a lot of debugging time in the future. 04:08.620 --> 04:14.530 Now let's create the global objects we need for the liquid crystal and the server. 04:14.710 --> 04:19.390 So let's start liquid crystal LCD. 04:20.320 --> 04:29.320 We need to give all those pins in the order so as default. 04:29.740 --> 04:40.780 And then let's align here with the parentheses, the five, the six and the seven. 04:42.760 --> 04:45.550 And let's do also servo. 04:47.160 --> 04:47.760 Servo. 04:48.840 --> 04:49.740 Let's name it Servo. 04:49.770 --> 04:50.100 Okay. 04:50.140 --> 04:51.150 LCD and several. 04:51.150 --> 04:54.480 We just have one, so let's name it LCD and Servo. 04:54.480 --> 04:58.530 If we had multiple ones, you would give of course, more meaningful names. 04:58.560 --> 04:59.070 Okay. 04:59.190 --> 05:04.410 For example, right door servo and left door servo here we just have one. 05:04.710 --> 05:06.480 Now in the void setup. 05:06.480 --> 05:08.670 So let's handle the void setup. 05:09.480 --> 05:11.820 I'm going to initialize in the next step. 05:11.820 --> 05:12.030 Okay? 05:12.030 --> 05:14.810 Because here we just initialize hardware components. 05:14.820 --> 05:19.440 So let's start with the servo servo dot attach. 05:20.170 --> 05:22.870 We've several pin. 05:23.800 --> 05:30.220 What we can also do for the several immediately is to put it in the close position. 05:30.220 --> 05:32.980 So basically to close the door, to lock the door. 05:32.980 --> 05:36.280 So we're going to do servo dot, right? 05:36.280 --> 05:38.860 And here you can play with the servo. 05:38.890 --> 05:45.640 You can just give different angles and put a plastic part on it to see which positions are going to 05:45.640 --> 05:46.900 suit your project. 05:47.380 --> 05:53.560 And what you can do is you can create let's create another two defines here. 05:54.410 --> 06:11.240 Define several open door position and let's define several close door position so that if we have this 06:11.240 --> 06:17.810 right now, then when we receive the command, we can just ask the server to go to this position. 06:17.810 --> 06:25.850 And for me, I'm going to use 50 and 140 degrees. 06:25.880 --> 06:26.120 Okay? 06:26.120 --> 06:28.940 We are not going to go from 0 to 180 here. 06:29.120 --> 06:34.910 I have just put two values in the middle and you can see the difference here is 90 degrees. 06:34.910 --> 06:41.960 And so this here is the position where the plastic parts that I've put on my server is going to be straight. 06:41.960 --> 06:43.880 So the door is not locked. 06:43.880 --> 06:49.430 And here we rotate it by 90 degrees to close the door. 06:49.580 --> 06:50.180 Okay. 06:50.300 --> 06:54.870 A quick tip here I recommend is if you use a hobby servo motor, don't go to the extreme. 06:54.900 --> 06:55.110 Okay? 06:55.140 --> 06:59.700 Don't go close to zero and don't go close to 180. 06:59.790 --> 07:01.800 Try to stay somewhere in the middle. 07:01.830 --> 07:02.250 Okay. 07:02.250 --> 07:03.690 But you can make your own experiment. 07:03.690 --> 07:06.270 You can use those values to continue with the project. 07:06.270 --> 07:11.610 But if you install the servo on a real door, then you might just experiment and choose different values. 07:11.640 --> 07:12.090 All right. 07:12.090 --> 07:17.250 So I'm going to first write the servo close door position. 07:17.550 --> 07:17.820 Okay. 07:17.820 --> 07:20.310 We don't want the door to be open by default. 07:20.310 --> 07:23.040 We want the door to be closed by default. 07:23.700 --> 07:26.550 So we have the servo initialized. 07:26.700 --> 07:37.110 Now let's initialize the pushbutton, for example, with pin mode button pin input and then pin mode 07:37.110 --> 07:41.670 buzzer pin output. 07:42.210 --> 07:50.670 Let's do the RGB pin mode with RGB red pin output. 07:51.510 --> 07:54.690 And let's do also the two other legs. 07:56.710 --> 08:07.210 So we have green and we have blue and then we are left with the LCD screen. 08:07.210 --> 08:17.740 So LCD dot begin 16 by two and we are going to print a welcome message or just starting LCD dot print 08:18.970 --> 08:21.340 starting like this. 08:22.220 --> 08:28.220 And what I'm going to do is I'm going to add just a delay here with 1000 milliseconds. 08:28.220 --> 08:31.610 So just one second and then LCD dot clear. 08:32.090 --> 08:37.940 So this I usually do in my Arduino applications when I have an LCD is for something like starting for 08:37.970 --> 08:43.670 one second, two seconds, something like that, and then clear the screen so that we know when the 08:43.670 --> 08:44.420 problem is starting. 08:44.420 --> 08:47.210 And we know basically when we enter the void loop. 08:47.210 --> 08:49.970 And that's always a nice message to print for the user. 08:50.090 --> 08:50.540 All right. 08:50.570 --> 08:54.240 Now that we have all of that, let's try. 08:54.260 --> 08:55.700 Let's upload the code. 08:55.890 --> 08:56.020 Okay. 08:56.030 --> 08:58.940 So we should have the servo that goes to the closed position. 08:58.940 --> 09:02.480 We should have also starting printed on the LCD screen. 09:02.480 --> 09:03.710 So I'm going to upload. 09:03.710 --> 09:07.690 Let's make sure the ball is here and upload. 09:07.700 --> 09:11.270 Let's name it Intercom. 09:12.140 --> 09:14.810 Step two create a step. 09:14.810 --> 09:16.640 One was to define the protocol. 09:17.540 --> 09:18.710 Compiling. 09:19.810 --> 09:21.550 And then uploading. 09:23.360 --> 09:24.290 Starting. 09:24.710 --> 09:29.300 You can see we had starting and well, the server is in the closed position. 09:29.300 --> 09:31.490 It was already here so it didn't move. 09:31.820 --> 09:38.690 But you can see here the closed position is the, uh, the, the lock mechanism will be like this and 09:38.690 --> 09:41.420 the open position, the lock mechanism will be up. 09:41.840 --> 09:42.240 Okay. 09:42.260 --> 09:43.190 Like this. 09:44.210 --> 09:46.310 Close and open. 09:47.000 --> 09:47.300 Okay. 09:47.300 --> 09:52.250 And we have just finished the step two of the project, so not the most interesting one of course, 09:52.250 --> 09:53.930 but a necessary one. 09:53.930 --> 09:59.600 So then we can focus on the application because we have everything correctly initialized.