WEBVTT 00:00.080 --> 00:05.920 This is the solution of the previous activity where you have to start from the previous activity. 00:05.950 --> 00:07.850 So activity number three again. 00:07.850 --> 00:13.910 But this time we are going to put some logs from the Arduino to the LCD screen. 00:13.910 --> 00:17.510 And so first of all, we are going to initialize the LCD screen. 00:17.510 --> 00:25.430 So I'm going to include the liquid crystal library. 00:25.430 --> 00:28.790 So liquid crystal dot H with angle bracket. 00:28.790 --> 00:30.950 And then add some define for the pin. 00:30.950 --> 00:43.550 So LCD is PIN, which is eight four, and then LCD pin which is a five. 00:44.090 --> 00:46.100 And let's actually copy this. 00:47.490 --> 01:01.470 Four more times with d4 d5 d6 D7, which are pins number two, three, four and five. 01:02.910 --> 01:05.370 And so we can now create the LCD object. 01:05.370 --> 01:06.680 So let's create it here. 01:06.690 --> 01:16.560 Liquid crystal, let's name it LCD again with all the pins, so S and then E So make sure you respect 01:16.560 --> 01:17.210 the order here. 01:17.220 --> 01:17.820 Okay? 01:17.850 --> 01:18.870 That's very important. 01:20.040 --> 01:20.970 And then. 01:22.310 --> 01:22.950 Let's go. 01:22.950 --> 01:23.700 Here. 01:24.860 --> 01:25.790 The five. 01:28.700 --> 01:33.380 And D6 and D7. 01:35.300 --> 01:35.840 Okay. 01:35.840 --> 01:45.140 Now in the setup, so we have begin we can also do LCD dot begin with 16. 01:47.020 --> 01:47.530 And to. 01:49.530 --> 01:54.840 So here again, the order doesn't really matter because as soon as the LCD is started, well, you can 01:54.840 --> 01:56.730 start to print something. 01:56.940 --> 01:59.760 And now, well, we're going to use the LCD here. 01:59.790 --> 02:05.400 So let's say that when we send the counter at the same time we do serial.println. 02:05.430 --> 02:09.750 So just after that, maybe we do LCD dot clear. 02:10.320 --> 02:10.440 Okay. 02:10.440 --> 02:16.530 So we clear the screen from anything that was on the screen before we do the LCD. 02:16.710 --> 02:28.350 Set cursor zero zero to go back to the beginning of the screen and we say, let's say LCD dot print 02:28.380 --> 02:29.400 with. 02:30.720 --> 02:32.970 Since counter. 02:35.220 --> 02:35.520 Okay. 02:35.520 --> 02:39.870 And let's do LCD dot print with the counter. 02:40.050 --> 02:46.620 So here, as you can see, if we do a print and then another print where the cursor it starts from zero 02:46.620 --> 02:51.660 zero and then it's going to go to one, two, three, four, five, six, seven, eight, nine, ten, 02:51.690 --> 02:54.240 11, 12, 13, 14. 02:54.240 --> 02:59.530 So we just have two more characters that are possible here. 02:59.550 --> 03:05.410 So basically, as long as the counter doesn't reach 100, we're going to get all the characters. 03:05.430 --> 03:14.510 If you want, you can also do LCD dot set cursor with zero and one. 03:14.520 --> 03:18.600 So basically you're going to print that on the first line and that on the second line, okay, let's 03:18.600 --> 03:20.250 keep it like this. 03:20.490 --> 03:28.440 And now when we receive something here, well, for example, what we could do is directly when we receive 03:28.440 --> 03:30.480 a comment, just print that comment. 03:30.510 --> 03:35.650 Or we could do a different LCD print for each comment. 03:35.740 --> 03:36.000 Okay. 03:36.010 --> 03:37.930 With a custom text that we want. 03:37.930 --> 03:41.410 But here I'm just going to do this LCD dot clear. 03:42.100 --> 03:42.310 Okay. 03:42.310 --> 03:48.430 If I don't do LCD dot clear, everything is going to be written on top of what's what has been written 03:48.430 --> 03:52.360 before, but it's not going to remove the other characters. 03:52.360 --> 03:55.120 So you may have something that is quite weird on the screen. 03:55.120 --> 04:02.080 So that's why when I write something here with the logs, I'm going to do LCD clear and LCD dot set 04:02.980 --> 04:03.230 clear. 04:03.280 --> 04:09.610 So zero zero LCD dot print cmd. 04:10.790 --> 04:11.060 Okay. 04:11.060 --> 04:17.900 So whenever we send something or we receive a command, the screen is going to be cleared and we're 04:17.900 --> 04:21.280 going to get the new log that is printed. 04:21.290 --> 04:23.060 So let's try that. 04:23.060 --> 04:25.940 Okay, I'm gonna upload the code first. 04:25.940 --> 04:29.090 Let's name it activity for. 04:32.610 --> 04:34.720 I'm going to also save this file. 04:34.740 --> 04:36.480 This python file as. 04:37.800 --> 04:40.830 Activity as well. 04:42.050 --> 04:44.480 He even if that's the same code. 04:44.480 --> 04:48.500 And then let's start the Python program. 04:51.570 --> 04:52.890 Okay, so sale Okay. 04:52.890 --> 04:55.320 And you can see here send counter. 04:55.920 --> 04:56.430 Okay. 04:57.520 --> 05:02.440 You can see and we have reset counter and then send counter because well, it goes very fast and we 05:02.440 --> 05:03.490 just received it. 05:03.520 --> 05:06.400 We just receive the command before we send another counter. 05:07.330 --> 05:12.010 You can see up to 20 and then reset, counter send counter. 05:12.130 --> 05:12.610 Okay. 05:12.610 --> 05:16.480 So you can see basically what's happening from the Arduino. 05:18.540 --> 05:20.440 I'm going to kill this. 05:20.460 --> 05:26.940 And so, as you can see, this system is not the best ideal system because, for example, here on the 05:26.940 --> 05:35.550 Raspberry Pi, the logs that we see here are kind of better, but that's always something you can do 05:35.550 --> 05:36.900 to debug a little bit. 05:36.900 --> 05:40.730 And you can see also that it's not just about debugging. 05:40.740 --> 05:45.960 Now you can see that you can control the LCD screen directly from your Raspberry Pi, okay? 05:45.960 --> 05:51.030 Because here you just send some text and you can print that text on the LCD. 05:51.270 --> 05:58.890 So you can already control some Arduino components from the Raspberry Pi going through the serial communication. 05:58.890 --> 06:01.140 And that's the end of this activity. 06:01.170 --> 06:01.950 Number four.