WEBVTT 00:00.110 --> 00:05.720 This is the solution of the previous activities or activity number eight, where you have to control 00:05.750 --> 00:11.930 Arduino from Telegram so you can send some text on the LCD screen and you can also choose the color 00:11.930 --> 00:15.050 for the RGB with just one command. 00:15.080 --> 00:16.610 So we have a few things to do. 00:16.610 --> 00:24.560 Let's start, as always, with the Arduino side and let's okay, let's initialize here 00:27.410 --> 00:32.810 with the baud rate while not serial. 00:33.950 --> 00:36.230 Okay, that's pretty fast to do. 00:36.380 --> 00:42.110 And then we will need to initialize the LCD and the RGB. 00:42.410 --> 00:50.990 So let's create the defines, define RGB rate pin, which is 11 define. 00:52.590 --> 00:56.850 RGB green pin, which is ten. 00:56.850 --> 00:59.190 Let's not make a mistake this time on the blue. 01:00.450 --> 01:05.760 Blue pin, which is nine and not 19 like I did before. 01:05.850 --> 01:12.030 And then define LCD s pin. 01:12.030 --> 01:14.130 I'm going to put the number just after. 01:14.310 --> 01:18.270 Define LCD e pin. 01:18.930 --> 01:21.720 Define LCD four. 01:24.240 --> 01:30.870 So we have d4 d5 d6 d7 five. 01:32.230 --> 01:43.990 Six seven with A4 a5 two, three, four and five. 01:44.770 --> 01:44.980 Okay. 01:44.980 --> 01:47.500 You make sure they are correctly configured. 01:48.430 --> 01:54.940 We include the liquid crystal, but. 01:55.570 --> 01:58.490 With a Y here H. 01:59.110 --> 02:01.750 And then we create the liquid crystal here. 02:01.750 --> 02:03.730 So liquid. 02:05.370 --> 02:06.570 Crystal LCD. 02:06.840 --> 02:08.850 So the initialization is always the same. 02:08.850 --> 02:12.000 You can even copy paste the code from the previous. 02:14.440 --> 02:19.930 Blessings if you want to go rcd for. 02:21.470 --> 02:22.280 And then. 02:24.900 --> 02:28.380 D5 d6. 02:30.330 --> 02:31.110 And. 02:33.300 --> 02:34.140 D7. 02:36.810 --> 02:38.250 Okay, let's do. 02:39.780 --> 02:43.080 LCD dot begin 16 by two. 02:45.120 --> 02:54.000 And let's also do the Pinmode with RGB red. 02:57.200 --> 02:58.250 To output. 03:00.170 --> 03:03.140 And then the same for the green. 03:06.390 --> 03:07.770 And the same for the blue. 03:11.240 --> 03:15.440 And we are done with initialization of the Arduino component. 03:15.710 --> 03:17.810 Now in the void loop. 03:18.530 --> 03:21.400 So I'm going to remove that and I'm going to do this again. 03:21.410 --> 03:21.890 Okay. 03:21.890 --> 03:23.810 Explaining it step by step. 03:24.530 --> 03:29.750 So in the void loop, we don't have any other thing to do than checking the sale. 03:29.900 --> 03:43.190 So if cell dot available greater strictly than zero, we are going to read the command is equal to sale 03:43.190 --> 03:49.040 dot read string until backslash n. 03:50.310 --> 03:54.620 And then we are going to check if command is equal to. 03:54.630 --> 03:55.260 Okay. 03:55.380 --> 03:56.790 Let's start with the LCD. 03:57.060 --> 04:01.590 What command do we receive here and what command do we send here? 04:01.740 --> 04:07.590 So this command will contain first something that we can recognize, for example, print text, but 04:07.590 --> 04:11.820 then it's going to contain something that we don't know yet from the Arduino side. 04:11.820 --> 04:12.390 Okay. 04:12.510 --> 04:19.440 So instead of just checking the equality for the comment, I'm going to do, if Command Dot starts with 04:19.440 --> 04:27.240 and let's say that the command starts with print, text, colon, and then we have the text. 04:27.240 --> 04:30.450 So if it starts with this, we are going to do. 04:31.350 --> 04:33.210 Comment dots remove. 04:33.540 --> 04:37.350 So we remove the first comment. 04:37.350 --> 04:42.600 So 1234, five, six, seven, eight, nine, ten, 11. 04:43.380 --> 04:46.050 So we remove from 0 to 11. 04:47.680 --> 04:55.330 And we are left with the text to print and let's do LCD dot print command. 04:55.450 --> 04:59.590 And before we print the command, we could also, for example, do LCD dot clear. 04:59.950 --> 05:00.420 Okay. 05:00.610 --> 05:04.780 And LCD dot set cursor. 05:06.520 --> 05:08.170 Zero zero. 05:08.350 --> 05:09.010 We clear? 05:09.010 --> 05:10.060 We come back to the beginning. 05:10.060 --> 05:11.680 We print the text. 05:12.340 --> 05:15.760 Okay, Let's go to the next. 05:15.970 --> 05:17.560 So else if. 05:18.660 --> 05:21.670 Command starts with. 05:21.720 --> 05:23.790 Now we have the set led. 05:25.270 --> 05:25.500 Okay. 05:25.560 --> 05:30.630 So we check if it's a print text command or a set led command. 05:31.740 --> 05:33.720 If this is the case. 05:33.870 --> 05:42.360 Okay, before I forget, I'm just going to add else where we do nothing for now and well, I will add 05:42.360 --> 05:44.370 a best practice in the final project. 05:44.370 --> 05:44.560 Okay. 05:44.580 --> 05:48.390 For this else that you're going to see later, one thing at a time. 05:48.480 --> 05:54.660 So if we have the command that starts with set, then one, two, three, four, five, six, seven, 05:54.660 --> 05:55.230 eight. 05:55.260 --> 06:01.530 We do command dot remove zero eight and then we get each color. 06:01.530 --> 06:13.650 So int red is equal to command dot sub string from 0 to 3 and dot to int. 06:14.400 --> 06:14.670 Okay. 06:14.670 --> 06:18.090 You can put this as a help if you want to count. 06:18.780 --> 06:20.130 Let's say we have this. 06:21.570 --> 06:27.000 So zero one, two, three and then four, five, six, seven. 06:27.540 --> 06:30.200 So we do int green. 06:30.240 --> 06:33.360 Of course it's important that when you send the command, you respect the order. 06:33.400 --> 06:33.710 Okay. 06:33.750 --> 06:38.550 Red, green, blue command dot substring. 06:41.340 --> 06:43.650 From 4 to 7. 06:43.650 --> 06:47.820 So we just ignore the comma to int. 06:48.360 --> 06:51.480 INT blue is equal to comment dot 06:54.300 --> 06:55.530 substring. 06:56.100 --> 06:56.450 Okay. 06:56.460 --> 06:58.740 If this is seven, then this is eight. 06:58.770 --> 07:04.590 We put eight and we don't need to provide the end if we just want to go until the end. 07:04.620 --> 07:04.920 Okay. 07:04.920 --> 07:13.620 So we just read the three last characters to inch to inch because we have a string we need to convert 07:13.620 --> 07:16.200 to int so we can use in analog. 07:17.460 --> 07:18.270 Right. 07:19.050 --> 07:22.710 Analog, right with the red first. 07:24.320 --> 07:31.400 And we give red color and let's do the same for the green and the blue. 07:33.490 --> 07:35.740 Green with green. 07:37.890 --> 07:38.910 And blue 07:42.300 --> 07:45.750 with the blue we just got. 07:46.560 --> 07:49.140 Okay, let's remove that. 07:50.160 --> 07:53.010 And I think our program is complete. 07:53.040 --> 07:54.630 Let's just try it. 07:54.660 --> 07:58.770 Okay, Let's upload the code. 07:59.310 --> 08:02.670 Activity eight. 08:03.640 --> 08:04.840 And let's try. 08:07.290 --> 08:07.560 Okay. 08:07.560 --> 08:09.600 We first have an error here. 08:11.100 --> 08:12.960 Yes, because I forgot. 08:12.960 --> 08:15.960 So this is quite a sneaky error here. 08:15.960 --> 08:16.950 I forgot. 08:18.940 --> 08:23.050 The parentheses because we open parentheses, we open one, so we have to close two. 08:23.290 --> 08:25.030 And of course, the same here. 08:26.300 --> 08:26.690 Now. 08:28.420 --> 08:28.720 Okay. 08:28.720 --> 08:29.920 The compiling works now. 08:29.920 --> 08:32.350 The uploading should work as well. 08:32.620 --> 08:35.440 And well, let's try something here. 08:35.440 --> 08:40.840 So I'm going to open the serial monitor and let's send some commands. 08:40.840 --> 08:43.510 For example, we want to print something. 08:43.510 --> 08:48.820 So print text with let's put a space here, for example. 08:48.820 --> 08:50.590 Hello world. 08:50.830 --> 08:54.280 You can see we have Hello World on the screen here. 08:54.310 --> 09:00.400 And we have well, we have actually one space before because you can see we have added one space. 09:00.400 --> 09:05.290 So everything that we have after print text, colon is going to be printed. 09:05.320 --> 09:08.950 Let's change the string with Abcd, for example. 09:09.130 --> 09:11.530 You can see now everything has been cleared. 09:11.560 --> 09:17.050 We start back at the beginning and we print Abcd if I do. 09:17.410 --> 09:26.080 GB No, actually it's set led with let's put 200 and then zero and then 180. 09:27.250 --> 09:27.490 Okay. 09:27.490 --> 09:32.900 We have a purple, a purple color, so it's correctly working. 09:32.990 --> 09:33.470 Okay. 09:33.470 --> 09:40.280 So now that we know the Arduino code is working, let's write the code so that we can actually control 09:40.280 --> 09:41.810 this from Telegram. 09:42.050 --> 09:42.290 Okay. 09:42.290 --> 09:46.520 So on the Raspberry Pi, let's first connect to Serial. 09:46.850 --> 09:51.890 And I'm going to here I'm not going to write the code entirely. 09:52.940 --> 09:58.430 I'm going to use the code we did previously with the retry. 09:58.470 --> 09:58.970 Okay. 10:01.160 --> 10:02.420 So like this. 10:03.620 --> 10:04.610 And then. 10:06.660 --> 10:07.440 This. 10:09.580 --> 10:12.040 So we connect. 10:13.090 --> 10:14.290 We try to connect to. 10:14.710 --> 10:16.540 And then we wait for three seconds. 10:17.170 --> 10:17.920 Okay. 10:17.920 --> 10:26.560 And we have this infinite loop running inside a try except. 10:26.560 --> 10:31.600 Block And now I am going to add, so I'm just going to leave it there. 10:32.350 --> 10:39.520 I'm just going to comment that this is a comment and I'm going to add the Telegram functionality. 10:39.550 --> 10:51.340 So from Telegram dot txt, we are going to import this time updater and comment handler. 10:52.060 --> 10:57.790 I'm going to get the token like we did before, so I'm just going to get the token. 10:58.960 --> 10:59.860 Like this. 11:01.360 --> 11:11.320 So, for example, here and then we are going to create not a bot object, but an update operator is 11:11.320 --> 11:13.210 equal to update. 11:15.190 --> 11:17.590 We've token equals. 11:17.620 --> 11:20.500 Telegram, Token. 11:20.710 --> 11:29.530 Okay, so we do that after we have correctly initialized the cell here we add a dispatcher, which is 11:29.530 --> 11:36.100 a data dot dispatcher, and then we are going to add some callbacks. 11:36.640 --> 11:42.440 So let's add the callbacks right here before this code. 11:42.460 --> 11:47.200 So def let's say we have a start handler. 11:47.770 --> 11:58.210 Okay, let's always create a start handler update context and in the start handler we do context. 11:58.720 --> 12:16.370 Dot, dot, dot, send message with chat ID is equal to update dot effective chat.id and text is equal 12:16.370 --> 12:18.050 to let's say hello. 12:21.170 --> 12:23.840 Now, maybe just welcome. 12:24.440 --> 12:27.170 Okay, We have the start handler. 12:27.560 --> 12:32.180 Then we create a let's name it lxd handler. 12:32.420 --> 12:32.930 Okay. 12:34.110 --> 12:37.050 A date context. 12:38.050 --> 12:42.130 And what do we do when we receive a comment from the LCD? 12:42.280 --> 12:46.690 We are going to send that command to the Raspberry Pi. 12:46.720 --> 12:49.880 So how to get the text? 12:49.900 --> 12:56.950 The text is update dot message, dot text. 12:57.160 --> 12:58.870 I'm going to remove that now. 13:00.190 --> 13:01.270 And now. 13:01.920 --> 13:03.780 The string to send. 13:03.780 --> 13:09.750 So the command is going to be equal to print text. 13:09.930 --> 13:10.130 Okay. 13:10.170 --> 13:12.600 Because we need to send print text here. 13:13.570 --> 13:18.310 And then plus text and then plus backslash. 13:18.310 --> 13:21.970 N and we do say dot. 13:23.140 --> 13:29.800 Right command dot encode with UTF eight. 13:31.510 --> 13:32.200 Okay. 13:32.320 --> 13:40.660 And also what we could do is just send back a message to our bot to confirm that we have done the operation. 13:40.660 --> 13:41.200 Okay. 13:41.440 --> 13:45.260 Context dot, dot, dot send. 13:45.280 --> 13:47.230 So actually that's going to be the same as here. 13:50.050 --> 13:51.430 And the text. 13:52.270 --> 13:53.140 Let's just send. 13:53.160 --> 13:53.680 Okay. 13:54.810 --> 14:01.620 All right, now we have diff RGB handler, so you just name it as you want. 14:01.620 --> 14:05.670 That's just a function update context. 14:05.790 --> 14:08.280 But as you can see, I usually put handler. 14:08.310 --> 14:08.760 Okay. 14:08.760 --> 14:12.150 I put the name of the command and then handler. 14:12.150 --> 14:15.630 So that's it's easier to navigate the code. 14:16.480 --> 14:22.960 Okay, we have the text which is also update dot message dot text. 14:23.350 --> 14:26.290 We create the command is equal to. 14:27.430 --> 14:29.590 So the command this time is set. 14:32.150 --> 14:38.270 With Colon and we expect the user from Telegram to give us the correct format. 14:38.300 --> 14:38.680 Okay. 14:38.750 --> 14:40.710 For the command we're going to send. 14:40.820 --> 14:42.860 So this I'm just going to leave it like that. 14:42.860 --> 14:50.390 But as an improvement, what you could do is to validate the data here also and then try to find another 14:50.390 --> 15:00.020 way to send data with a less strict format plus backslash n at the end, let's not forget that. 15:00.020 --> 15:02.780 And then we just do the same thing here. 15:04.470 --> 15:09.060 We write the comment and we send back a message to the chat. 15:09.360 --> 15:13.350 Okay, now let's not forget to add those handlers. 15:13.350 --> 15:13.560 So. 15:13.560 --> 15:17.070 Dispatcher Dot add Handler. 15:19.110 --> 15:28.650 Command handler and we have so the keyword start is going to go with start handler. 15:29.490 --> 15:33.090 And then let's add another two of those. 15:34.830 --> 15:40.530 We will have the command LCD, which is going to go with the LCD handler. 15:40.590 --> 15:46.650 So you don't necessarily have to put the same command here and the same name for the function. 15:46.650 --> 15:47.060 It doesn't. 15:47.130 --> 15:48.240 It is not linked. 15:48.240 --> 15:48.450 Okay. 15:48.540 --> 15:54.480 Just use it for simplicity and Argb command for the RGB handler. 15:55.110 --> 15:55.470 Okay. 15:55.470 --> 16:05.460 After we have all the commands that are ready to be dispatched, we do a data dot, start polling. 16:06.180 --> 16:14.460 And the last thing is that when we actually close the program, we do closing sale and we then do print. 16:16.850 --> 16:22.520 Stopping telegram data. 16:24.080 --> 16:24.280 Okay. 16:24.440 --> 16:24.650 Where? 16:24.650 --> 16:28.340 We have to wait a few seconds and we do a data dot. 16:28.700 --> 16:29.480 Stop. 16:30.680 --> 16:32.150 So we start and we stop. 16:32.660 --> 16:35.030 All right, let's try this code. 16:35.900 --> 16:41.300 So we have written more than 50 lines of code, and let's just try. 16:41.330 --> 16:42.560 Let's see if it works. 16:43.370 --> 16:44.270 Activity. 16:46.960 --> 16:47.410 Eight. 16:50.420 --> 16:52.520 So let's see what we get here. 16:52.850 --> 16:55.270 Successfully connected to soil. 16:55.430 --> 16:55.970 Okay. 16:57.010 --> 17:03.260 Now let's open telegram and let's just send some comments. 17:03.260 --> 17:05.800 So LCD Hello. 17:05.830 --> 17:07.450 Let's see what we get. 17:08.320 --> 17:08.620 Okay. 17:08.620 --> 17:12.970 You can see on the screen we have not just hello, but we have slash LCD space. 17:12.970 --> 17:13.510 Hello. 17:13.690 --> 17:18.640 So we need to come back to our program and well, here we haven't tested. 17:18.640 --> 17:22.390 Okay, So it was kind of luck if it was going to work or not. 17:22.390 --> 17:29.110 But when you see that we get update dot message dot text, we get the complete text, okay. 17:29.380 --> 17:32.380 Even with the command and the space. 17:32.680 --> 17:36.240 So we need to remove that before we send it, of course. 17:36.250 --> 17:42.700 So what we can do is actually something similar that we did here in the on the Arduino is to remove 17:42.700 --> 17:44.380 the first N characters. 17:44.380 --> 17:45.580 Okay, let's do that. 17:45.610 --> 17:47.290 It's going to be simpler. 17:47.440 --> 17:49.150 So here we receive. 17:51.110 --> 17:55.420 So we received slash LCD space and then comment. 17:57.260 --> 18:02.520 So we have one, two, three, four, five characters to remove. 18:02.540 --> 18:07.310 So what we can do is just do five and colon and bracket. 18:07.310 --> 18:10.800 So a string is also an array of characters. 18:10.840 --> 18:14.750 Okay, So if you do that, you're going to remove the first five characters. 18:14.780 --> 18:17.750 Okay, let's run again. 18:21.890 --> 18:24.800 And once it is connected, let's send. 18:25.880 --> 18:26.810 The same. 18:27.600 --> 18:27.980 LCD. 18:28.020 --> 18:28.710 Hello. 18:31.590 --> 18:37.230 And you can see now we have hello on the screen. 18:37.590 --> 18:44.770 And so I'm going to come back to the program to change, of course, here for the RGB handler. 18:44.790 --> 18:46.860 So for the RGB handler we have. 18:48.550 --> 18:51.780 Slash RGB and then comment. 18:51.940 --> 18:56.320 So we have also one, two, three, four, five characters to remove. 18:56.350 --> 19:03.670 So we do this five colon bracket to take everything after the fifth character. 19:04.330 --> 19:05.740 Let's run that. 19:09.800 --> 19:11.270 Say, ah, okay. 19:11.510 --> 19:15.050 And let's try with Slash. 19:16.790 --> 19:24.530 Let's give the same color as before 200 zero 180 and let's see what we get. 19:24.560 --> 19:29.240 You can see now the RGB is purple. 19:29.270 --> 19:37.100 Okay, let's bring some text LCD, It works and well, it correctly works. 19:37.940 --> 19:42.830 We can control the Arduino components from Telegram Chat. 19:43.160 --> 19:43.580 All right. 19:43.580 --> 19:46.160 And this is the end of this activity.