WEBVTT 00:00.210 --> 00:06.380 This is the solution of the previous activity where you need to create a small traffic light system, 00:07.170 --> 00:09.510 so we have three entities. 00:09.930 --> 00:16.170 The first thing we are going to do is to initialize it is to create a constant and then initialize. 00:16.180 --> 00:20.300 Then we build mode and then we are going to write the application code. 00:20.790 --> 00:23.380 So define eddied. 00:23.490 --> 00:29.090 So before we have written lipping, now we need to make the difference between the three entities. 00:29.100 --> 00:30.900 So I'm going to write the one. 00:32.280 --> 00:44.050 In this has been number 12 and then define added to PIN, this has been number 11 and define any three 00:44.730 --> 00:46.640 in this has been number 10. 00:47.460 --> 00:49.090 So the first one is the right one. 00:49.140 --> 00:57.150 Then we have the yellow one and then the green one, if you want, as an alternative, meaning you could 00:57.150 --> 00:58.150 name them, for example. 00:58.230 --> 00:58.620 Right. 00:58.620 --> 01:01.800 And Dippin Yellow and Green Arrow Dippin. 01:02.370 --> 01:03.930 But here that will do. 01:04.140 --> 01:09.180 And if we want to change the decal off our specific pin, we don't need to actually change the name. 01:09.750 --> 01:16.410 So we have our three define here in the setup and going to do in mode. 01:16.830 --> 01:25.630 We've added one in and out, so we set the mode as an output. 01:25.720 --> 01:31.140 People can agree to copy this twice for a two and three. 01:32.790 --> 01:38.570 So now all the scenes are set to output mode for digital. 01:39.060 --> 01:45.960 I'm going also to initialize all the states for all the pains to know, OK, well, just in case we 01:45.960 --> 01:46.530 are sure. 01:46.560 --> 01:53.510 So digital by just in case we are sure that all the ads will be pulled up. 01:54.250 --> 01:54.760 No. 01:55.410 --> 01:55.750 A. 01:57.360 --> 01:58.710 Into also be. 02:00.070 --> 02:01.840 And two entities, three. 02:03.660 --> 02:10.830 So now the initialization is complete, all the pins are set up to output mode, and we will no state 02:11.370 --> 02:19.710 and no in the loop function, we are going to first go around the red area, OK, and keep it on for 02:19.710 --> 02:20.760 three seconds. 02:21.300 --> 02:23.340 So digital. 02:24.300 --> 02:24.840 Right. 02:25.620 --> 02:29.520 And one thing I. 02:29.760 --> 02:33.480 OK, and keep it on for three, six days a week. 02:33.600 --> 02:35.310 Three hours. 02:36.330 --> 02:39.870 After that, I'm going to put on the green. 02:40.900 --> 02:42.040 And so. 02:43.080 --> 02:51.150 Digital rights, LSD, the green LSD, the three teen with high. 02:52.050 --> 02:58.140 But what I also need to do is to pull off the digital rights. 02:58.410 --> 03:03.540 And one thing is the power of the parade, OK? 03:03.870 --> 03:06.910 Because otherwise both entities will be forgotten. 03:06.940 --> 03:12.150 OK, if I use digital right here with high on it one thing, then it's still high. 03:12.180 --> 03:13.600 So I need to put it to low. 03:13.740 --> 03:19.680 OK, the first we're on the red alert and then wait three seconds. 03:19.870 --> 03:29.060 Then we were off the road and we were on the green and then we wait for another three siggins OK. 03:29.520 --> 03:33.030 Or the second if we keep the green for three seconds. 03:34.080 --> 03:38.730 And then what we do is we put on digital right. 03:39.240 --> 03:41.880 With energy to in. 03:41.930 --> 03:42.870 We on. 03:44.190 --> 03:52.410 The signal for one signal, but actually here, that's the same thing with the green educated green 03:52.410 --> 03:53.820 energy, we will answer. 03:53.850 --> 03:57.360 We need to Polaroids of the digital. 03:59.080 --> 04:02.040 Right, and three. 04:03.880 --> 04:05.830 In we've know. 04:06.870 --> 04:10.440 And then we wait for one single. 04:12.320 --> 04:19.580 All right, and then after this one segment, then we finish the look, we come back here and here we 04:19.670 --> 04:21.320 go on the editing. 04:22.130 --> 04:30.650 But again, at this point, if we pull on the yellow alley here, then it's still on when we arrive 04:30.660 --> 04:30.960 there. 04:31.220 --> 04:33.560 So we need to pull it off. 04:34.130 --> 04:38.870 Digital rights so that the two. 04:40.110 --> 04:41.280 In the. 04:42.720 --> 04:44.640 All right, to remove this. 04:45.970 --> 04:56.260 So to recap, first we pull up on the right and we pull off the yellow one, then we wait three seconds 04:57.400 --> 05:05.200 after three seconds the green and will be on and the red and you will be pulled off it for three more 05:05.200 --> 05:05.800 seconds. 05:05.800 --> 05:08.510 And then it's time for the yellow and green. 05:08.800 --> 05:16.370 And of course, we pull out of the green and then we once again and continue and go back again. 05:16.870 --> 05:19.120 And now let's applaud the program. 05:19.120 --> 05:22.590 OK, let's limit activity. 05:23.600 --> 05:24.020 I. 05:26.740 --> 05:35.860 And I can see first the red and then the green and then yellow for Walsingham, right for three seconds, 05:36.610 --> 05:42.610 green for three seconds, yellow for once again and then all over again. 05:43.600 --> 05:47.820 And you have successfully creeky your first traffic light system. 05:48.250 --> 05:55.270 And just one thing with the code here to make it maybe simpler to read and maybe also simpler to modify 05:55.270 --> 05:56.120 in the future. 05:56.650 --> 06:01.840 So here we just modify any one and two and then one in three and then two and three. 06:02.410 --> 06:06.710 What we could do is also see for the first time digital. 06:07.150 --> 06:10.570 Right, any three in low. 06:11.040 --> 06:16.820 So that is quite redundant because we already said it's too low before, but then we have one, two 06:16.820 --> 06:17.290 or three. 06:17.290 --> 06:19.390 And then we see we have high, low and low. 06:19.780 --> 06:23.410 And then what we can do is aim for a second block. 06:24.740 --> 06:29.090 One, two, three, with low, low, high, and then we are missing. 06:30.810 --> 06:33.400 And one here, OK? 06:33.490 --> 06:40.530 And as you can see, it's maybe more readable, OK, every time we said digital right for the three 06:40.710 --> 06:46.770 pins, OK, but just here you can see first it's high, low, low and then low, low, high and then 06:46.770 --> 06:48.670 low, high, low, low. 06:48.690 --> 06:50.160 This way it's more reliable. 06:50.160 --> 06:56.830 And maybe if you want to change the behavior, you will more easily avoid to make some mistakes, OK? 06:57.300 --> 07:03.420 The best code is not necessarily the code with the less lines in it, OK, it's best to have shorter 07:03.420 --> 07:08.610 code, but any time you should put more importance on the reliability of the program. 07:08.640 --> 07:12.860 So if this means a few more lines, then just add those few lines. 07:13.290 --> 07:13.710 All right. 07:13.710 --> 07:15.070 And that's the end of the security.