WEBVTT 00:00.240 --> 00:06.840 This is the solution of the previous activity where you need to get a string from the cell communication, 00:07.050 --> 00:11.710 so you read the string and you print it on the LCD display screen. 00:12.240 --> 00:15.810 So let's start with the cellular communication. 00:16.140 --> 00:17.620 I'm going to initialized to you. 00:18.030 --> 00:33.020 Say all that, begin OK, and then sell it time out with 10 milliseconds in the loop function. 00:33.030 --> 00:40.030 I'm going to do if sale if the label is greater than zero. 00:40.530 --> 00:45.450 So if we have received any data, we are going to put this into a string. 00:46.080 --> 00:51.870 Text is equal to say you read string. 00:53.920 --> 00:58.250 And we got the text, so that's pretty much it for the cell communication. 00:58.270 --> 01:00.220 You don't need to do anything else. 01:00.220 --> 01:03.960 You just take cell available and then read train. 01:04.450 --> 01:14.890 Now, what I'm going to do is I'm going to create a function here, void print, use a text on display 01:16.010 --> 01:19.320 with a string text as a parameter. 01:20.740 --> 01:24.520 And here we are going to print the text on Etsy. 01:25.270 --> 01:32.050 So then I can use this function here directly after I have read the string, I'm going to send it to 01:32.050 --> 01:38.340 that function so I don't need to write the code of that function in the loop and know where our value 01:38.350 --> 01:40.300 is complete for this activity. 01:40.690 --> 01:47.340 OK, so we keep it minimal and then we have the functionality here in the function that. 01:47.800 --> 01:49.970 All right, that's it for the sale. 01:49.990 --> 01:55.420 No, let's initialize the liquid crystal display on the LCD screen. 01:56.050 --> 01:57.490 So include. 01:59.520 --> 02:06.060 Liquid crystal dumped H and then we need to do a bunch of defiance. 02:06.510 --> 02:10.200 I'm going to do them here once again for this activity. 02:10.650 --> 02:12.720 So Elsley up as. 02:13.750 --> 02:16.810 Dean, which is a fine for me. 02:18.280 --> 02:31.030 And C, d, e, d, which is a four, then define LCG before being which is number six and need to do 02:31.030 --> 02:41.440 this three more times or so, the five, which has been number seven, the six which is PIN number eight 02:41.440 --> 02:51.820 and seven, which is number nine, I got my six being set to correctly make sure you don't make any 02:51.820 --> 02:55.060 mistakes and then I'm going to create so leaky. 02:57.060 --> 03:04.830 Crystal LCD, I create these in global scope so that I can access the LCD screen everywhere in my program, 03:05.670 --> 03:07.350 we first address. 03:08.860 --> 03:12.790 Then in, then defore. 03:14.120 --> 03:19.790 All right, I go to a new line to make it better and more readable, the five. 03:22.060 --> 03:23.770 The six. 03:25.330 --> 03:28.030 And D7 and that's it. 03:28.900 --> 03:39.670 OK, our LCD is now here, and what I can do in the setup is the LCD begin 16 by two because this is 03:40.300 --> 03:41.590 the hardware that we have. 03:42.280 --> 03:42.610 Great. 03:42.620 --> 03:44.920 So now everything is set up. 03:45.730 --> 03:48.170 We receive the text from the sale. 03:48.190 --> 03:54.860 Now we can use this function to print the text on SD and actually what are we going to do in that function? 03:55.240 --> 03:58.360 So first we are going to validate the text. 03:58.510 --> 04:00.800 OK, validate that it's not too long. 04:01.060 --> 04:13.750 OK, after we do this, we set the cursor with a line zero one and then print text and let's start by 04:13.750 --> 04:16.520 validating the text length. 04:16.540 --> 04:25.240 So if text that length you have the length function, OK, which give you the length of the text. 04:25.240 --> 04:27.420 Quite straightforward here. 04:28.690 --> 04:31.090 This is greater than 16. 04:32.100 --> 04:32.910 And what do we do? 04:32.970 --> 04:39.150 I'm simply going to do this text is equal to text to log. 04:40.300 --> 04:46.810 So if the text is too long, I just replaced the text with another text and this is the error message 04:46.810 --> 04:48.220 that we are going to print. 04:48.690 --> 04:49.990 OK, that is good. 04:50.020 --> 04:59.030 Now, we said the cursor to line zero one, so let's do LCD notes, said Jesso. 04:59.740 --> 05:01.540 So the column will be zero. 05:01.540 --> 05:05.100 And then the line how to alternate between the lines with. 05:05.140 --> 05:05.930 It's quite simple. 05:05.950 --> 05:10.720 We are going to create a new viable here line. 05:10.720 --> 05:14.910 Let's initialize it to zero and going to put it there. 05:15.610 --> 05:19.600 So first time it's zero and then we are going to toggle this. 05:19.600 --> 05:21.400 If it's zero, we set one. 05:21.400 --> 05:23.320 If it's one we said to zero. 05:23.570 --> 05:30.970 OK, so right now here I'm setting the closer to column zero and the cursor line, which is either zero 05:30.970 --> 05:31.510 or one. 05:31.750 --> 05:34.060 And then I can do that print. 05:35.400 --> 05:40.410 Let's do that, actually, let's put that here and see what Prince. 05:41.590 --> 05:49.740 Text, so we are printing the text that is already validated on the correct language of Kyozo here, 05:50.110 --> 05:54.820 and then what I do is if Kyozo line is equal to zero. 05:56.340 --> 06:05.460 The cursor is now equal to one, and then it's just so the line is equal to zero, so that's pretty 06:05.460 --> 06:06.250 common for you. 06:06.300 --> 06:13.110 Now you just alternate between zero and one to the next time you enter this, the line will be different. 06:13.530 --> 06:13.860 All right. 06:13.870 --> 06:16.020 So to recap, we validate the text. 06:16.290 --> 06:18.300 We said the cursor to the right place. 06:18.300 --> 06:22.350 We printed the text and we alternate because of the next time. 06:22.720 --> 06:23.780 And that's pretty much it. 06:24.030 --> 06:28.740 So let's see if the code compiles and let's say it as activity. 06:30.160 --> 06:30.940 16. 06:33.310 --> 06:36.790 All right, no, let's applaud the cut to the original. 06:38.630 --> 06:47.180 OK, I'm going to open the sale monitor also so you can see on the arena board we have well, on the 06:47.180 --> 06:52.790 LCD, we have nothing, OK, no text is printed because we didn't ask to print anything. 06:52.950 --> 06:59.510 I'm going to send hello know like this on the sale, Marinko, and you can see Hello, Alino, on the 06:59.510 --> 07:00.620 first line. 07:00.980 --> 07:08.760 And then let's send another text which will be printed on the line number two. 07:08.960 --> 07:16.070 OK, now let's say I send a very, very, very long text. 07:16.340 --> 07:19.040 OK, this will be more than 16 characters. 07:19.490 --> 07:22.570 You can see text too long, OK? 07:23.090 --> 07:26.630 And this has been printed on the first line again. 07:26.660 --> 07:31.790 OK, let's try with yet another text. 07:32.750 --> 07:37.940 OK, this is perfectly 16 character and this is printed on the second line. 07:38.060 --> 07:46.240 OK, no, let's just print ABC and well that's something that we are going to need to fix in your code 07:46.250 --> 07:55.040 because you can see here we have ABC, which was printed on the line number zero here and the on number 07:55.040 --> 07:55.400 zero. 07:55.850 --> 08:00.770 So it will replace all the text, OK, all the text that is going to be printed. 08:01.010 --> 08:07.200 We replace the previous text, but all the text that is after that will actually not be replaced. 08:07.490 --> 08:13.310 So now you have problem, try to send some short strings and if you already have some text, you can 08:13.310 --> 08:21.800 see, well, that's just going to replace the text and then you have a mess on your display screen. 08:21.800 --> 08:22.760 So let's fix that. 08:23.240 --> 08:25.400 And actually, that's pretty easy. 08:25.700 --> 08:33.680 After we have validated text, what do we can do is to add some space to complete the 16 characters 08:33.680 --> 08:34.290 for the line. 08:34.310 --> 08:36.140 OK, so you have two choices. 08:36.140 --> 08:41.810 If you want to clear spaces on the LCD screen, you can use LCD clear. 08:41.960 --> 08:45.080 But if you do, that is going to clear all the LCD. 08:45.170 --> 08:47.220 So you are going to lose the two lines. 08:47.330 --> 08:47.640 OK. 08:48.110 --> 08:53.180 The other option is simply to print some and text or just on space. 08:53.510 --> 08:55.850 So you are going to remove the previous characters. 08:56.450 --> 09:02.480 So what I'm going to do here, I'm going to the four and then I'm going to do a follow up to add characters 09:02.480 --> 09:05.580 to finish the line and I'm going to start. 09:05.610 --> 09:08.300 So I is equal to text. 09:13.650 --> 09:20.100 So if the text length is, let's say, four characters, I'm going to start at four. 09:20.440 --> 09:24.410 OK, and then it is strictly lower than 16. 09:24.930 --> 09:32.620 So I'm going to go so let's say from four to 15, OK, which is just before 16, a plus plus. 09:33.060 --> 09:34.600 And what do I do here? 09:34.980 --> 09:42.660 I'm going to do text and in plus equal to add the character and I'm going to add just an empty character. 09:42.690 --> 09:43.700 So just a space. 09:44.370 --> 09:46.500 So let's say your text is. 09:48.200 --> 09:56.960 ABC, OK, this is three characters, what these followed will do is simply add characters here to make 09:56.960 --> 09:57.860 it up to. 09:58.190 --> 10:01.870 So I don't know exactly, but here let's say this is 16 characters. 10:02.120 --> 10:04.550 So this is the text that you are going to print. 10:04.580 --> 10:14.540 OK, so if previously you had some other text here in the OK, let's let's say you have this. 10:15.970 --> 10:25.060 And if you're replaced with this, all of the text here will be replaced by empty spaces and you are 10:25.060 --> 10:27.140 going to clear the rest of the screen. 10:27.730 --> 10:29.530 So, no, let's upload this. 10:31.110 --> 10:32.580 And now let's open the say on. 10:33.180 --> 10:41.250 I'm going to send a long stream, quite long string and see yet another text. 10:41.490 --> 10:46.530 OK, and now I'm going to send just text, which should replace the first line. 10:46.800 --> 10:50.180 And you can see we have the correct behavior, ABC. 10:50.580 --> 10:55.600 OK, if I send a very long screen, takes too long. 10:55.620 --> 10:59.670 OK, and then let's send a load. 11:01.680 --> 11:08.900 And we know, OK, and then I just sent A I just think B and you can see we have the correct behavior. 11:09.600 --> 11:10.100 All right. 11:10.110 --> 11:12.290 And this is the end of this activity.