WEBVTT 00:00.150 --> 00:06.920 This is the solution of the previous activity where you need to inform the user of the potential danger, 00:07.110 --> 00:14.480 OK, if the ultrasonic sensor detects an object that is too close from the robot or the area. 00:14.760 --> 00:20.910 So what I'm going to do first, I mean, it could be a. a crude and create new sketch that I'm going 00:20.910 --> 00:25.740 to name or copy paste and save as activity. 00:27.110 --> 00:27.770 15. 00:29.380 --> 00:37.330 So all the kahir is already set up to correctly get the distance from the ultrasonic sensor, and we 00:37.330 --> 00:41.340 don't block the execution of the application by using the Internet. 00:41.620 --> 00:42.730 So I know what I'm going to do. 00:42.730 --> 00:45.460 I'm going to first initialize the three entities. 00:45.980 --> 00:46.830 Let's go back here. 00:46.840 --> 00:47.850 Let's put that here. 00:48.550 --> 00:53.290 Define any one in which is 12. 00:55.750 --> 01:05.410 And the to the 11, so the other of the 10 is actually not that important as long as you just are consistent 01:05.440 --> 01:08.400 with how you use the valuable then in your program. 01:10.630 --> 01:17.600 And this so in the OK, we have to define here in the set up. 01:17.620 --> 01:22.930 I am going to do more in any one. 01:24.350 --> 01:24.710 In. 01:28.500 --> 01:40.380 And I'm going to do the same for the energy, too, and for the three entities are set up and now I'm 01:40.380 --> 01:40.800 going to. 01:40.830 --> 01:42.690 So I'm not going to write the code here. 01:42.690 --> 01:50.550 I'm going to do it nice with a new function that I'm going to put in void of to name dysfunction, let's 01:50.550 --> 01:51.390 say power. 01:53.060 --> 02:01.000 And it is from distance, OK, and this will get a perimeter double distance. 02:02.610 --> 02:07.940 So we are going to check for the distance we receive here in centimeter. 02:08.770 --> 02:12.180 I'm going to use a classic structure, OK, if dist.. 02:14.040 --> 02:19.020 Is greater than one hundred and it's a greater or equal. 02:20.890 --> 02:22.930 OK, then, over on. 02:24.240 --> 02:24.600 Great. 02:25.750 --> 02:34.890 And if we use offensive, if the distance is greater or equal than, let's say, 15. 02:36.020 --> 02:38.420 And the distance. 02:39.870 --> 02:40.740 Is lower. 02:42.070 --> 02:43.090 Then 100. 02:45.580 --> 02:51.910 Then we Google glasses, but actually this we don't need to use it. 02:52.060 --> 02:59.460 OK, this condition is already through here because, well, if the distance is greater equal than 100, 02:59.470 --> 03:02.410 we go here and then if not, we go in. 03:02.590 --> 03:08.680 And if so, when we are in the cells, if we already know that the distance is strictly lower than one 03:08.680 --> 03:09.000 hundred. 03:09.280 --> 03:10.980 So we don't need to check that condition. 03:12.460 --> 03:20.380 So if the distance is greater than 100, great, if not so if the distance is lower than 100 but greater 03:20.380 --> 03:21.880 than 15, then. 03:23.100 --> 03:24.030 But we're on. 03:25.340 --> 03:25.920 Yellow. 03:27.200 --> 03:29.420 And then something else because. 03:30.740 --> 03:36.910 It means that the distance is strictly lower than 15, so we don't need to check the condition that 03:36.910 --> 03:37.490 we record. 03:37.510 --> 03:38.740 That is redundant. 03:39.040 --> 03:42.820 We just need to write the catch and put on. 03:43.480 --> 03:43.820 Right. 03:44.530 --> 03:45.840 So power hungry. 03:45.870 --> 03:48.640 We are going to do digital, right. 03:49.640 --> 03:57.590 And one in to know she's the right one, digital rights to. 03:58.730 --> 04:07.560 In two local also yellow digital rights, any three been high. 04:08.270 --> 04:13.440 This is the green one, I mean, to copy this and put it there. 04:14.090 --> 04:23.690 So now if the distance so if we are in the warning mode, we want to pull up on the yellow two. 04:24.440 --> 04:32.470 And if we are in the danger zone, we're having to pull up on any one but luck. 04:32.600 --> 04:36.320 So we have low, low, high, low, high, low and high, low, low. 04:37.310 --> 04:37.820 All right. 04:38.540 --> 04:42.560 So then what do we need to do is simply to call this function? 04:43.850 --> 04:46.280 Here, so we can print. 04:46.910 --> 04:54.440 Let's let's do that here so we get the distance and then we call power and it is from a distance we 04:54.470 --> 04:56.600 in the distance as a parameter here. 04:57.290 --> 05:00.920 And then we print also the distance to remove that. 05:02.300 --> 05:04.070 And well, that's pretty much it. 05:04.820 --> 05:11.390 So you see, we just have added one function, OK, and now the code in the void loop is almost the 05:11.390 --> 05:13.810 same and we didn't have to modify anything. 05:13.820 --> 05:20.070 It still works great, OK, because we have correctly used the time functionality here to trigger the 05:20.070 --> 05:23.210 retro sonic sensor and not block the code with delay. 05:23.540 --> 05:29.090 And because we have also used the pulse in function correctly so we don't block anything and now we 05:29.090 --> 05:31.520 have much more flexibility in the program. 05:31.790 --> 05:36.110 So now what are we going to do is to upload the. 05:36.140 --> 05:37.550 So let's verify first. 05:38.850 --> 05:41.250 And now let's upload the code. 05:42.300 --> 05:50.190 OK, let's open the cellular monitor and as you can see here, so we have OK, I'm going to move it. 05:51.930 --> 06:01.490 OK, we have one hundred forty centimeter and the green is spoiled, and now I'm going to put some obstacles, 06:01.500 --> 06:06.190 I'm going to put myself in the way, OK? 06:06.240 --> 06:14.060 And you can see here we are at 75 centimeters and you have the yellow there is on. 06:14.540 --> 06:15.510 You can see it. 06:15.510 --> 06:17.280 It's blinking a little bit. 06:17.400 --> 06:23.700 And it's because, well, you need to make sure that the scenario is quickly plug in the brain balled. 06:23.910 --> 06:28.700 It might move a little bit, so make sure it's correctly plugged. 06:29.430 --> 06:33.360 OK, that's one of the drawback of the breadboard is something you might have. 06:33.360 --> 06:43.090 Some components that are not like that will make the mixture directly, like in the rainbow. 06:43.560 --> 06:50.670 And now you can see if I put my hand very close from the sensor, you can see we have some going to 06:50.670 --> 06:51.600 put my two hands. 06:51.900 --> 06:55.250 You can see we have the right danger. 06:56.010 --> 06:57.830 The obstacle is ready to close. 06:58.080 --> 06:59.280 I'm going to go back. 07:00.090 --> 07:05.790 It goes to yellow and then I'm going to remove every obstacle and now it goes to green. 07:08.840 --> 07:14.420 All right, it's working, so now you have a visual indication to know if the obstacle is too close 07:14.420 --> 07:15.260 from the sensor.