WEBVTT 00:00.080 --> 00:05.690 Let's now write the code to just print something simple on the LCD screen. 00:05.690 --> 00:11.110 So first of all, we are going to use a define for each of the pin that we need. 00:11.120 --> 00:14.630 Okay, so define I'm going to put LCD. 00:14.630 --> 00:20.450 So we will need the S pin, which is pin number eight four. 00:20.450 --> 00:28.190 And then define LCD pin, which is pin number eight five. 00:28.220 --> 00:41.870 Then we need the pins from So LCD, the four pin, which is two and we will need D4 d5 D6 and D7. 00:41.870 --> 00:51.110 So let's change that 567, which are PIN number two, three, four and five. 00:51.140 --> 00:51.380 Okay. 00:51.380 --> 00:55.040 So we have six pins that we need in our program. 00:55.280 --> 01:04.010 Then to initialize the LCD screen, we will need first to include the liquid crystal. 01:05.580 --> 01:06.310 Libraries. 01:06.480 --> 01:08.290 Liquid crystal dot H. 01:08.310 --> 01:10.390 Like this with angled brackets. 01:10.410 --> 01:15.390 Then we can add so not in the void setup, but in the global scope here. 01:15.660 --> 01:18.690 Liquid crystal. 01:18.930 --> 01:26.520 Let's name it LCD and we are going to initialize it by providing the different pins here in the order. 01:26.520 --> 01:27.520 So R. 01:27.570 --> 01:29.550 S and then E. 01:30.970 --> 01:32.950 And then D4. 01:34.300 --> 01:37.780 And then I'm going to go to a new line here. 01:38.080 --> 01:39.970 Let's put D5. 01:40.570 --> 01:42.370 Let's align this here. 01:43.960 --> 01:47.830 The six and the seven. 01:50.240 --> 01:53.480 So we have our LCD object. 01:53.780 --> 02:02.560 And now to finish with the initialization in the void setup, we do LCD dot begin with 16 and two. 02:02.570 --> 02:09.770 So we are going to use 16 columns and two lines, which is basically what the screen has. 02:09.770 --> 02:18.200 And then well, if you want to print something on the screen, you just do LCD dot print and let's say 02:18.830 --> 02:25.220 starting with dot, dot, dot, let's say we want to print that at the beginning. 02:26.650 --> 02:29.770 So let's make sure that the board is connected. 02:29.770 --> 02:32.020 Let's upload the code. 02:33.310 --> 02:34.300 I forgot here. 02:34.300 --> 02:34.600 So. 02:34.600 --> 02:37.150 Well, the error is here, but I forgot here. 02:37.420 --> 02:38.230 A comma. 02:40.290 --> 02:41.490 Let's run again. 02:43.620 --> 02:43.890 Okay. 02:43.890 --> 02:45.750 And this is what you can see here. 02:45.750 --> 02:52.410 So maybe you will not have anything is because you need to move the potentiometer until you find you 02:52.410 --> 02:59.520 can see here, until you find the correct angle for the potentiometer to correctly calibrate the screen. 03:01.170 --> 03:04.490 So here it looks good. 03:04.500 --> 03:04.770 Okay. 03:04.770 --> 03:07.680 We have starting correctly displayed. 03:07.680 --> 03:12.870 So make sure that for the first time you actually move the potentiometer so that you can see something. 03:12.870 --> 03:15.420 Once you see something, then we can go further. 03:16.150 --> 03:16.480 Okay. 03:16.480 --> 03:22.180 And now, for example, if you want to clear the screen, let's say we do delay 2000. 03:22.180 --> 03:27.310 So we want to print for two seconds and then we do LCD dot clear. 03:27.580 --> 03:33.130 This is going to print starting and after two seconds it's going to clear the entire screen. 03:33.130 --> 03:34.450 Let's upload this. 03:37.000 --> 03:43.000 So you can see starting and after two seconds, the text is gone. 03:43.210 --> 03:43.660 All right. 03:43.660 --> 03:46.990 So let's actually comment that. 03:47.590 --> 03:50.740 And one other thing is that you can actually play with the cursor. 03:50.740 --> 03:54.460 So by default, the cursor is going to be at zero and zero. 03:54.460 --> 04:02.770 So you can do LCD dot set cursor and by default, it's going to be here zero and zero. 04:03.220 --> 04:05.470 Here you can see you have 16 by two. 04:05.500 --> 04:09.520 So if you put, for example, three, that's going to be on the third column. 04:09.520 --> 04:13.690 If you put one here, that's going to be on the second line. 04:13.690 --> 04:13.900 Okay. 04:13.900 --> 04:15.850 So we start to count at zero. 04:15.850 --> 04:19.930 So you can go from 0 to 15 here and 0 to 1 here. 04:20.170 --> 04:23.820 And so here we're going to print starting, but let's see where. 04:23.830 --> 04:25.420 So upload. 04:27.590 --> 04:34.130 And you can see we print starting on the second line, starting from the fourth column. 04:34.170 --> 04:34.350 Okay. 04:34.370 --> 04:36.440 Because this is the three and one. 04:36.440 --> 04:38.810 So that's second line, fourth column. 04:38.930 --> 04:45.410 And so every time we want to change the cursor, you just do LCD set cursor and then you start to print 04:45.410 --> 04:49.730 something and that's going to start to print from where the cursor is. 04:50.030 --> 04:50.450 Okay. 04:50.450 --> 04:51.920 So basically that's pretty much it. 04:51.920 --> 04:53.990 First you initialize the LCD. 04:54.020 --> 04:59.020 You do LCD dot begin with 16 by two and then we've set cursor. 04:59.030 --> 05:01.710 You can set the cursor to a different place with print. 05:01.730 --> 05:05.060 You print some text and LCD clear is very useful. 05:05.060 --> 05:09.620 So you can also clear the entire screen before you write something.