WEBVTT 00:00.180 --> 00:07.310 This is the number six of the final project, so now that we have initialized the liquid crystal, also 00:07.320 --> 00:15.350 the LCD screen, we are going to use it to print the correct distance measured by the ultrasonic sensor. 00:15.600 --> 00:22.440 So we already have some visual information with the yellow OLED, which is blinking faster if the obstacle 00:22.440 --> 00:23.130 is closer. 00:23.610 --> 00:25.350 And then we have the locked mode. 00:25.770 --> 00:31.800 Whenever the obstacle is getting to close with the LCD, we are going to be able to get more information 00:32.040 --> 00:35.670 and also to be able to give the user some instructions. 00:35.670 --> 00:42.290 For example, when the application is not to say that you have to press the button to unlock the application. 00:42.570 --> 00:43.670 So let's do this. 00:44.490 --> 00:50.070 So I'm going to create a new function that's created here. 00:50.790 --> 00:56.040 Void print distance on NCG. 00:58.040 --> 01:01.320 And we get the distance in centimeters. 01:01.360 --> 01:04.290 OK, again, I'm using centimeters here. 01:04.520 --> 01:07.510 We are going to convert to inches later in the project. 01:07.820 --> 01:14.030 And so here what I want to do, I want to check first if he's locked. 01:15.680 --> 01:25.190 OK, and then it's so I'm going to use a different behavior if the application is locked out, the application 01:25.190 --> 01:30.680 is not locked, OK, if it's locked, I'm going to bring some error message until the application is 01:30.680 --> 01:32.930 unlocked and with some instruction. 01:33.110 --> 01:38.960 And if it's not locked, I'm going to put simply the distance and maybe with a warning we can other 01:38.960 --> 01:46.760 one, OK, we can add an intermediate threshold, for example, 50 centimeters to say that if the obstacle 01:46.760 --> 01:54.950 is at a distance lower and 50 centimeters, we print a warning, OK, before we get to the error state. 01:55.460 --> 02:00.770 So one thing I'm going to do is call that function whenever we get the distance here. 02:01.670 --> 02:02.360 Look here. 02:04.460 --> 02:07.600 So this we continue to read it, OK? 02:07.610 --> 02:13.610 We continue to rule whatever happens, we continue to rate the distance and then they print the distance 02:13.880 --> 02:19.320 the and depending on the is locked, which is already set. 02:19.340 --> 02:23.690 OK, with the lock and unlock function, we already have the mechanism which is working now. 02:23.690 --> 02:29.170 We just need to use that, like to know if the application is locked out. 02:29.510 --> 02:34.550 So let's start with the normal behavior if the application is not locked. 02:34.550 --> 02:35.670 So normal behavior. 02:36.080 --> 02:40.280 What I'm going to do is print on the first line distance and print on the second line. 02:40.280 --> 02:42.350 Some information research. 02:42.710 --> 02:44.750 OK, so acidy set. 02:45.920 --> 02:52.820 Just so I'm going to use the Kyozo with zero and zero to be on the first column, first line. 02:54.080 --> 03:01.010 And in the end, Saudi brains, I'm going to do this, not distance, because we have distance, we 03:01.010 --> 03:05.390 will not have the place to print the distance and the unit. 03:05.960 --> 03:09.830 So just this and the intensity that Prince. 03:11.880 --> 03:19.160 Distance or the distance that we get here in the parameter and function and then acidy, that brains 03:19.170 --> 03:23.720 are going to bring to the unit, which is fono centimeters, we're going to come back to that later 03:23.970 --> 03:31.200 and I'm going to adjust a few spaces, OK, just in case, because the distance here, if we have three 03:31.560 --> 03:38.040 digits or for example, the distance is one hundred forty point zero zero, then we have one, two, 03:38.070 --> 03:40.290 three, four, five, six characters. 03:40.620 --> 03:43.520 But now let's say it's 14 centimeters. 03:43.540 --> 03:43.920 We have. 03:44.950 --> 03:50.870 Only five characters, OK, if it's eight centimeters, we have only four characters. 03:51.520 --> 03:58.660 So with the additional spaces, we make sure that if the new text we print is smaller than the previous 03:58.660 --> 04:02.080 one, we don't keep the previous characters at the end of the line. 04:02.110 --> 04:05.040 OK, so the first line, we bring the distance. 04:05.260 --> 04:05.760 All right. 04:06.010 --> 04:08.410 And then I'm going to LCD set. 04:10.310 --> 04:20.750 Just so we've zero and one to start in the segment and then check, if so, what are you going to do 04:20.750 --> 04:24.860 is I'm going to add a new here we have long distance. 04:25.210 --> 04:27.440 I'm going to say define. 04:29.570 --> 04:37.310 Running distance, which is 50 centimeters, and again, those values, you can just modify them as 04:37.310 --> 04:37.630 you want. 04:37.820 --> 04:44.720 You just need to modify your view here and it will automatically update all your program with this new 04:44.720 --> 04:45.120 value. 04:45.140 --> 04:48.430 So that's very convenient, as you can see, to use to define you. 04:49.340 --> 04:50.570 So one in distance. 04:52.240 --> 04:59.680 I'm going to put that here if the distance so we get the distance in the distance is greater than the 04:59.680 --> 05:00.670 warning distance. 05:01.910 --> 05:03.950 Let's say got print. 05:05.360 --> 05:08.660 No obstacle, OK? 05:08.810 --> 05:18.260 Nothing to report and let's have a few spaces here to reach 16 or more characters and then else, which 05:18.260 --> 05:25.430 means that the distance is lower than the one in distance or the distance here will be lower than 50 05:25.670 --> 05:26.470 centimeters. 05:26.870 --> 05:29.090 And we do Elsley print. 05:30.330 --> 05:33.600 We let's say two exclamation mark in one. 05:35.870 --> 05:37.570 And it's quite a few species here. 05:39.590 --> 05:45.620 And then we don't need to check for the case when the distance is lower than the log threshold, because 05:45.620 --> 05:51.890 if this is the case, we are going to look we're going to log the application here. 05:52.160 --> 05:59.000 And because we love the application, we are going to enter the if is logged on the print distance and 05:59.000 --> 05:59.760 kidney function. 06:00.200 --> 06:06.860 So with the logic, we have said here, we are never going to enter this block of code if the application 06:06.860 --> 06:07.280 is blocked. 06:07.670 --> 06:12.090 So we don't need to check for the log threshold here, just the warning threshold. 06:12.560 --> 06:22.370 OK, so we have the normal behavior first distance in the distance in centimeters and then the message, 06:22.420 --> 06:24.770 no, a warning message. 06:24.950 --> 06:30.050 If we start to get close to the obstacle and then if the application is blocked, what are you going 06:30.050 --> 06:30.460 to do? 06:30.470 --> 06:36.890 So LCD set just saw zero zero to start the first line, first column. 06:37.610 --> 06:43.460 So now every time you call the brain first, you need to set the Kyosuke because you don't necessarily 06:43.460 --> 06:47.900 know where the Kyozo was set the last time you printed something. 06:47.900 --> 06:49.090 OK, it can be anywhere. 06:50.240 --> 06:52.310 And then I'm going to acidy prince. 06:54.310 --> 07:02.230 With three exclamation mark obstacle, and it's the other three and some species. 07:03.400 --> 07:06.970 And LCD does print, so said. 07:08.310 --> 07:09.240 Kyozo, actually. 07:11.070 --> 07:20.190 We zero one and see print, that's the price to unlock a few spaces. 07:21.270 --> 07:29.310 So here we print a big error message, ending price to unlock, to give an indication to the user of 07:29.310 --> 07:31.250 what to do to download the application. 07:31.500 --> 07:36.710 And the thing is that the lock mechanism, we don't need to do anything else. 07:36.930 --> 07:41.670 We just need to add action if it's locked at in action, if it's not locked. 07:41.730 --> 07:45.770 OK, because the lock mechanism is already handled here in the vault. 07:45.800 --> 07:50.910 Look like it's already handled with the lock here and with the lock you. 07:52.710 --> 07:59.460 So now, depending on each state of the application, we just need to say, OK, if this is that state 07:59.460 --> 08:02.700 we do this, if it is that other state, we do that. 08:03.090 --> 08:04.200 And that's quite simple. 08:04.500 --> 08:12.840 So once you have a solid foundation for your program, you can easily add new blocks that add nice functionalities 08:13.500 --> 08:18.540 without having to rewrite the entire mechanism, just using what you have built previously. 08:19.170 --> 08:20.990 OK, I think this is complete. 08:21.000 --> 08:25.570 So let's say let's verify and let's save some final project. 08:25.570 --> 08:28.440 Step number six, save it. 08:30.820 --> 08:33.990 Let's upload the code to the original. 08:37.060 --> 08:42.820 So you will see initializing and then you see first the distance on the first line here, one hundred 08:42.820 --> 08:46.040 forty centimeters and then no obstacle. 08:46.240 --> 08:49.080 So what I'm going to do is first I'm going to. 08:49.150 --> 08:52.350 So I'm need to add something in front of the sensor. 08:52.360 --> 08:56.760 But let's see here at about 30 centimeters, 25. 08:57.130 --> 08:58.400 And you can see one. 08:58.720 --> 08:59.990 So we start to have a warning. 09:00.020 --> 09:03.590 So the here and the yellow and it is blinking faster. 09:03.650 --> 09:09.420 Now we have the warning and the closer I get, I can see now we have the distance. 09:09.430 --> 09:13.540 And when I reach 10 centimeters, now you can see. 09:13.570 --> 09:19.960 So the application is locked and you can see no obstacle press to unlock and can see whatever I do. 09:19.960 --> 09:22.300 If I remove any obstacle, it's still not. 09:22.300 --> 09:23.510 So nothing will change. 09:23.890 --> 09:28.400 Now I need to press on the push button and it goes back to normal. 09:28.810 --> 09:33.880 OK, once again I go closer, closer and the application is locked. 09:35.450 --> 09:40.750 So as you can see, adding an LCD screen to your project is really nice because you can print anything, 09:40.750 --> 09:45.980 you can bring some data you get from the program, you can print some instructions, some warning, 09:45.980 --> 09:51.760 etc. This will give really useful instructions to the user of your application. 09:51.770 --> 09:56.170 And because you use the LCD screen, as you can see, we don't need to use the same monitor anymore. 09:56.180 --> 10:01.940 So from now you could power on your Arduino from any USB power source. 10:02.360 --> 10:10.280 Just put it on the program and just follow along with the instructions and values you see on the LCD 10:10.280 --> 10:10.630 screen. 10:11.030 --> 10:12.710 And that is the end of this step.