WEBVTT 00:00.120 --> 00:06.390 This is the solution of the previous activity where you need to bring the distance of the ultrasonics 00:06.390 --> 00:11.790 and Suso the distance measured by the sensor in the LCD display screen. 00:12.270 --> 00:13.440 So what are you going to do? 00:13.470 --> 00:15.530 I'm not going to start from scratch here. 00:15.570 --> 00:17.910 I recommend you to do it so you can practice more. 00:18.270 --> 00:23.880 I'm going to take the code for the ultrasonics, and so I'm going to take the code for the LCD screen 00:23.880 --> 00:25.850 and then add the functionality. 00:26.190 --> 00:31.000 So I'm going to open the activity, will hear the activity. 00:31.030 --> 00:34.400 15 in this activity. 00:34.980 --> 00:40.490 We were using the ultrasonic sensor with some LCD. 00:40.560 --> 00:44.510 OK, we are not going to use HD here, so I'm just going to take what I need here. 00:44.970 --> 00:52.840 So I have to define for the eco and the trigger pins and have all of that that I'm going to use. 00:53.300 --> 00:59.370 OK, so to set the time for the trigger, to set time for the pulse in the distance, the previous distance 00:59.370 --> 01:02.040 for the filter that we use. 01:04.230 --> 01:12.510 And then to trigger ultrasonics and so is the same function, I just think these douget, ultrasonic 01:12.660 --> 01:15.940 dist., is also the same. 01:16.680 --> 01:16.960 OK. 01:18.130 --> 01:27.220 They go down, then we have the echo interrupt, which is the same I don't mean this poor elitist from 01:27.230 --> 01:31.200 distance because we are not going to use them in an indoor setup. 01:31.210 --> 01:35.020 So in the setup, I have my Selvig in. 01:37.160 --> 01:41.060 I have the PIN code for echo and trigger pins. 01:43.000 --> 01:47.380 I don't need to mode for the ads, and I need also this interrupt. 01:51.750 --> 01:53.160 That's Bunnett here. 01:55.610 --> 02:01.400 And then in the void loop, where what do I do, I am just going to take everything. 02:03.360 --> 02:11.790 OK, and just remove this, we don't need to pull this from a distance, so that is the code to actually 02:11.790 --> 02:17.130 trigger the ultrasonic sensor every 16 milliseconds. 02:17.550 --> 02:23.700 And then we have to interrupt to handle the measurement of the distance and then we get the distance 02:23.700 --> 02:26.160 in our code directly in here. 02:26.160 --> 02:28.740 We just print it on the same monitor. 02:28.920 --> 02:35.210 Actually, I'm going to run most of sales because we are not going to use cell in this activity. 02:36.250 --> 02:42.220 But it can be good for you to use it when you're actually writing this program to test the program and 02:42.220 --> 02:44.810 see if things are working correctly here. 02:44.860 --> 02:48.730 I suppose that it's going to work because it was working for this activity. 02:49.600 --> 02:52.690 So I think I got everything I need. 02:52.840 --> 02:57.370 Just verify the sketch work activity. 02:58.950 --> 02:59.770 17. 03:02.070 --> 03:04.400 Let's see if we have an error, good. 03:04.570 --> 03:06.780 I'm going to open the activity. 03:08.040 --> 03:08.610 16. 03:09.950 --> 03:19.160 In which we have used the LCD screen and I'm going to initialize it here, so I'm going to include the 03:19.160 --> 03:19.860 library. 03:22.010 --> 03:26.250 And I'm going to do the defiance of the other for the defying doesn't matter. 03:27.170 --> 03:32.430 OK, then NCDC going to also take the course online here. 03:33.170 --> 03:34.710 So let's put that here. 03:34.730 --> 03:37.570 OK, the other here doesn't really matter. 03:37.970 --> 03:43.880 You have all your designs and then all the initialization of your global variables. 03:45.360 --> 03:51.910 And then we have the different functions, and so we don't need to use a text on display. 03:51.990 --> 03:58.350 OK, why do we need to do now is to set up the LCD we LCD Biggin. 03:59.770 --> 04:03.870 And I'm going to do that just here in the city. 04:04.150 --> 04:06.080 And that's pretty much. 04:08.100 --> 04:15.780 So now we have the reading of the ultrasonics, and so every 60 milliseconds, every whatever we put 04:15.780 --> 04:20.040 in is viable and the screen is initialized. 04:20.550 --> 04:23.070 So what we can do is go back to this void. 04:23.080 --> 04:27.210 Look, here we get a new distance if new distance available. 04:27.210 --> 04:30.860 So we said deflect false and we get the ultrasonic distance. 04:30.870 --> 04:33.540 So we will get a distance in centimeters. 04:33.750 --> 04:39.180 And here what we want to do is to print the distance on the LCD screen. 04:39.550 --> 04:45.660 And we also want first to print the rights of a frequently we receive the data. 04:46.230 --> 04:51.660 OK, so let's suppose that this right here is not going to change in the code. 04:51.690 --> 04:56.610 So what I'm going to do is here in the setup density print. 04:57.270 --> 05:04.260 So I'm going to the LCD sets Kissack with zero and zero, which actually I don't need to do. 05:04.260 --> 05:10.380 But just so it's clearer in the code and I'm going to print reads. 05:12.310 --> 05:21.070 And then Anthony screens, I'm going to take the view here, which is ultrasonic trigger delay and put 05:21.070 --> 05:24.730 it here and then I'm going to actually print. 05:26.410 --> 05:29.730 We've space and and as for this. 05:31.160 --> 05:36.080 So the first line we have the right and as you can see, if you print, print and print everything, 05:36.080 --> 05:38.710 the cursor will be moved. 05:38.720 --> 05:43.300 OK, if I don't, said the cursor, every time I bring the cursor, we automatically be moved. 05:44.000 --> 05:51.260 Let's just upload this to be sure that the LCD working and that we have the right print in here. 05:53.050 --> 06:03.490 And OK, we see right, 60 and 60 milliseconds, so if we ever change it, that then when we start the 06:03.490 --> 06:05.550 problem again, we are going to have a different view here. 06:06.070 --> 06:06.430 Great. 06:06.850 --> 06:19.360 Now let's create a new function here, void brains, distance on LCD and double distance. 06:21.010 --> 06:25.740 So in this function, we are simply well, this function is pretty self-explanatory. 06:25.750 --> 06:28.480 We are going to take this and printed on the. 06:29.350 --> 06:37.350 So what I'm going to do, I'm going to do first LCD sit just so zero and then one. 06:37.780 --> 06:40.990 OK, the first column, the second line. 06:41.440 --> 06:44.340 And I'm going to bring as print. 06:47.180 --> 06:49.250 These tents like this. 06:50.660 --> 06:59.450 And as brain, so that with brains after, so the cursor will be here and not here, brain distance. 07:00.490 --> 07:02.120 OK, let's check here. 07:02.140 --> 07:04.990 Actually, the length of the train. 07:05.020 --> 07:09.960 OK, we have one, two, three, four, five, six, seven, eight, nine, 10. 07:10.000 --> 07:12.040 We already have ten characters for this. 07:12.370 --> 07:15.160 So let's say we have so we have 10 here. 07:16.360 --> 07:20.650 Let's say now we have the maximum, which is four hundred, you will have this. 07:21.900 --> 07:29.350 So 10, 11, 12, 13, 14, 15, 16, so that's the max value. 07:29.820 --> 07:36.020 I mean, we've in the hundreds sort of three numbers here, we not take more than 16 characters now, 07:36.060 --> 07:38.420 let's say with just four centimeters. 07:38.760 --> 07:43.270 Well, the thing is that we we need to add two spaces to this. 07:43.560 --> 07:44.160 Why is that? 07:44.170 --> 07:48.550 Because simply this string will be shorter than the previous one. 07:48.990 --> 07:50.880 Let's say you go from four hundred to four. 07:51.240 --> 07:56.040 So if you bring a string shorter than the previous one, we have seen in the previous activity that 07:56.040 --> 07:59.860 it's not going to replace all the nine, but only the characters here. 08:00.120 --> 08:05.310 So you may have some weird characters or some additional characters at the end of the line. 08:05.880 --> 08:07.000 So what we can do here? 08:07.020 --> 08:08.960 So different choices. 08:09.420 --> 08:13.650 The easiest one is entity print and add just. 08:14.640 --> 08:23.280 Two spaces, OK, which means that for this case is going to be at 16 characters and for this case it's 08:23.280 --> 08:30.360 going to be at 18 characters, but if you tried to bring out 18 characters, simply the first 16 would 08:30.360 --> 08:30.910 be printed. 08:31.230 --> 08:32.400 So that's not a problem. 08:32.730 --> 08:33.090 All right. 08:33.930 --> 08:40.380 The next solution will be just to create string objects, to put this into the string and then to do 08:40.380 --> 08:44.780 a follow up on the string to check if you need to add or not spaces. 08:44.790 --> 08:50.010 But here, it's really easy to do that, and that's not going to make any problem in the project. 08:50.310 --> 08:50.630 All right. 08:50.640 --> 08:52.760 So this function is actually pretty simple. 08:52.920 --> 08:55.510 We said the kuso and then we print some text. 08:56.080 --> 08:59.730 Now, let's call this in here. 09:01.490 --> 09:09.350 With distance, and that's pretty much OK, we have the function that we call here, whenever we get 09:09.350 --> 09:16.690 the distance, we update the LCD display screen and let's upload the code to see if it works. 09:18.100 --> 09:23.920 So you can see on the first line, we have great 60 milliseconds and on the second line we have the 09:23.920 --> 09:29.640 distance in centimeter that is updated every so 60 milliseconds. 09:29.860 --> 09:33.490 So not it's one hundred thirty eight, which is the wall behind me. 09:33.700 --> 09:41.080 I'm going to put my hand here and you can see it's going to be at 11 centimeters. 09:41.320 --> 09:42.550 I go closer. 09:42.550 --> 09:43.810 You can see my hand on the screen. 09:45.370 --> 09:49.870 We are at here six or seven centimeters. 09:49.880 --> 09:52.000 OK, so it's walking. 09:52.360 --> 09:57.420 And no, you don't need to use the same monitor or any daybook tool from the original. 09:57.640 --> 10:01.860 You can directly get the feedback from the sensor on down in the world. 10:02.170 --> 10:09.460 So that's actually the first point where you can get such a feedback without doing anything with your 10:09.460 --> 10:10.010 computer. 10:10.270 --> 10:13.600 So now you could just, for example, power on your in the world. 10:14.110 --> 10:20.800 The code will be running on the ordinary both directly and you can just see the distance on the LCD 10:20.950 --> 10:21.290 screen. 10:21.290 --> 10:23.840 No need to open, for example. 10:24.160 --> 10:24.580 All right. 10:24.580 --> 10:26.550 And that is the end of this activity.