WEBVTT 00:00.150 --> 00:07.800 This is day two of the final project in this that we are going to make the LSD to the yellow LSD bank, 00:07.830 --> 00:14.790 which we're going to call the warning L.A. and we are going to update the blink rate of this ad with 00:14.790 --> 00:17.520 the distance from the ultrasonic sensor. 00:17.550 --> 00:20.670 So we already get the distance here. 00:20.910 --> 00:22.590 So now let's handle this. 00:23.580 --> 00:25.740 So I'm going to create a new design for the bean. 00:26.070 --> 00:32.670 And instead of naming here little one, two or three am going to meet thing. 00:33.810 --> 00:34.260 Ali. 00:35.130 --> 00:42.990 OK, which is on PIN the 11th for me, this is the yellow alley, but I have my pin, I can initialize 00:42.990 --> 00:45.000 the pin he pin mode. 00:46.960 --> 00:51.070 So this is one thing. 00:52.510 --> 00:54.500 Initialized to about. 00:56.620 --> 01:00.700 Then what I'm going to do anything to create also new variables here. 01:00.910 --> 01:09.900 So let's put some comment, ultrasonic it and let's do here warning. 01:11.020 --> 01:17.800 So I'm also going to use the time functionality to be able to make the edit blink every X amount of 01:17.800 --> 01:18.160 time. 01:19.160 --> 01:28.400 So unsigned, long last time wanting release, linked, for example. 01:30.600 --> 01:31.190 Moelis. 01:32.680 --> 01:39.790 And then unsigned long, let's say, warning added delay. 01:41.580 --> 01:48.120 So previously, I have used time interval as the name of the for the day here. 01:48.230 --> 01:54.450 Here I was dealing with this is not very important as long as you are consistent in a program. 01:54.480 --> 01:55.790 So I use delay. 01:56.040 --> 01:57.380 I use delay. 01:57.600 --> 02:01.730 And if it's reliable and if it makes sense, then that's not appropriate. 02:02.400 --> 02:04.770 And so I need to give a delay. 02:04.770 --> 02:05.180 The delay. 02:05.190 --> 02:07.660 We are going to say it from the distance where we. 02:07.740 --> 02:09.220 But I need to give a first value. 02:09.240 --> 02:11.070 OK, so let's put 500. 02:12.240 --> 02:21.120 OK, I this will be replaced, but just let's put any value as a full body, and then I need also bite 02:22.290 --> 02:27.030 one state and let's say it's low first. 02:27.940 --> 02:37.020 So I can toggle the OK directly, so we have our three vials here now in the loop. 02:38.600 --> 02:43.840 But we never look for nor we read the time we do the first action, which is to trigger the Petrossian 02:43.850 --> 02:46.130 extensively, and then we have check here. 02:46.400 --> 02:49.190 We check for the flight to see if we have a distance. 02:49.200 --> 02:52.690 So I'm going to add a new action here if timed. 02:53.090 --> 02:58.970 So we use the time, not the same one as here minus the last time. 02:59.840 --> 03:05.120 Hear the last time that one blinked. 03:08.920 --> 03:13.210 If this is greater than wanting any delay. 03:14.460 --> 03:19.740 What we do is take the same thing, we add the delay to the last time. 03:21.810 --> 03:31.170 And then we do blink, and it may be totally so I'm going to create a function here and I'm going to 03:31.170 --> 03:39.030 do it here, I'm going to create a function that can be here, void toggle running, anything. 03:41.870 --> 03:46.730 OK, so first I'm going to make it blink and then I'm going to change the brain, right? 03:46.780 --> 03:48.690 OK, one step at a time. 03:49.220 --> 04:01.310 So here I have so I can check if one in any state is equal to hi, I can set it to low. 04:06.510 --> 04:08.880 I can set it to high. 04:10.590 --> 04:16.200 And after setting the stage, after touring the state, I can do digital. 04:17.470 --> 04:28.100 Right, with the warning handed in and warning state, all right, quite done that here. 04:28.420 --> 04:34.780 And now I'm going to show you a small tip here to write this instead of one, two, three, four, five, 04:34.780 --> 04:37.300 six, nine, just use one line, OK? 04:37.600 --> 04:43.900 Because no, I guess you correctly understand what this does so we can try to optimize this with this 04:43.900 --> 04:48.640 code, because six lines just for that is actually quite a lot. 04:48.970 --> 04:55.720 So instead of this, I'm going to first comment this comment lines to toggle the state. 04:55.720 --> 05:04.420 I'm going to do one thing every state is equal to, and then I'm going to open parentheses and check. 05:05.630 --> 05:06.590 This condition. 05:08.460 --> 05:14.130 But interrogation, Mark, so basically, if this is true. 05:15.220 --> 05:23.290 Interrogation, like we are going to set the value low to develop, if this is false, then I put a 05:23.290 --> 05:25.690 column and we said, do you hike? 05:26.080 --> 05:28.140 And then a semicolon and that's it. 05:28.270 --> 05:31.860 And this is doing the exact same thing as these. 05:32.260 --> 05:37.300 So I have not shown you that before because, well, this is clearly an optimization. 05:37.300 --> 05:41.200 And it's best if you first understand how to do it in a simple way. 05:41.200 --> 05:49.780 And then with this week so quick recap about that, when you want to just assign one value or another 05:49.780 --> 05:54.420 value just for two values in one viable, you can test a condition. 05:54.440 --> 06:01.690 So you put the condition here inside parentheses and then interrogation match the value to put in the 06:01.690 --> 06:02.220 variable. 06:02.230 --> 06:07.780 If this is true, Calon the value to put in the variable if this is false. 06:08.830 --> 06:14.000 So this is what we may call a one line if statement. 06:14.470 --> 06:16.690 So as a warning, don't overuse this. 06:16.690 --> 06:22.540 OK, use this only when you have a case like this, when you just want to put one value or another value 06:22.540 --> 06:25.420 inside a variable, depending on one condition, that's it. 06:26.410 --> 06:33.550 So like this now the code is a little bit cleaner and we have a trigger warning entity that I am going 06:33.550 --> 06:34.090 to call. 06:35.510 --> 06:35.790 Right. 06:38.240 --> 06:45.140 All right, I know the LCD will blink at so every five hundred milliseconds, which is what is different 06:45.140 --> 06:45.420 here. 06:46.430 --> 06:50.380 So we have the blinking, but now we need to update the blink rate. 06:50.390 --> 06:54.200 So I'm going to create a new function just below that one void. 06:55.560 --> 07:01.500 Said one ed link right from. 07:08.100 --> 07:15.180 So quite explicit name for the function, a little bit known, but explicit, so we're going to receive 07:15.180 --> 07:17.920 the distance in some images. 07:18.120 --> 07:23.190 So, again, I'm going to use sentimentalizing all the program in inches only when we display for the 07:23.190 --> 07:23.560 user. 07:23.820 --> 07:31.590 So we receive a distance that is between zero and four hundred centimeters. 07:31.620 --> 07:32.730 OK, that's the unit. 07:32.730 --> 07:35.080 And that's the value that we were receiving. 07:35.460 --> 07:40.620 Not what we want to do is to set a blink rate between zero. 07:40.830 --> 07:49.050 And so in the spec, I have given one thousand six hundred milliseconds where you want to do something 07:49.050 --> 07:50.040 that is proportional. 07:50.070 --> 07:54.270 So if the distance is zero, the blink rate is zero. 07:54.270 --> 07:59.890 If the distance is four hundred, the blink rate will be one thousand six hundred. 08:00.690 --> 08:06.480 So basically, as you can see, if you want to go from disarranged to that range, you need to multiply 08:06.480 --> 08:11.510 the value by four, OK, four by four, 60. 08:11.970 --> 08:17.110 So we are simply going to do one thing, any delay. 08:17.580 --> 08:20.930 So this is the delay we have set here. 08:21.270 --> 08:28.490 So we are going to modify this and simply do distance multiplied by four. 08:29.010 --> 08:30.690 So the distance here is a double. 08:30.720 --> 08:37.810 We multiply it by four warning any delay is unsigned long, so it will be cast as unsigned long. 08:38.250 --> 08:40.100 So no problem with that. 08:41.040 --> 08:44.070 And well, that's the only line we need in that function. 08:44.460 --> 08:46.620 So now we need to call that function, of course. 08:46.630 --> 08:48.450 And where are we going to call it? 08:48.460 --> 08:49.740 We're going to call it right now. 08:49.770 --> 08:51.630 So when we get the new distance. 08:52.830 --> 09:00.300 Here we just call the function and we pass the distance as a parameter, I'm going to also commit this 09:00.900 --> 09:02.590 and the code is finished. 09:02.610 --> 09:09.150 So to recap, first, I have initialized and added the one here with the pin. 09:09.790 --> 09:20.460 Even I have created some variables for the time, functionality and to toggle the OK, then I have one 09:20.460 --> 09:22.260 function to toggle the lead. 09:22.260 --> 09:26.480 And you have seen a new way to do the one line statement. 09:26.900 --> 09:33.810 I told you I have a function to set the blink rate from the distance and then so intercepted by initialize 09:33.810 --> 09:43.230 the pin to output and in the loop I just add one action to my pool of actions here, which is to basically 09:43.230 --> 09:47.040 toggle the one entity and I change also to bring. 09:47.040 --> 09:47.410 Right. 09:47.430 --> 09:50.100 So I call the function when I get a new distance. 09:50.670 --> 09:52.800 So as you can see this and this and this. 09:52.800 --> 09:59.690 So the three things are going to be completely independent but are going to work together really nicely. 10:00.000 --> 10:05.220 And what we can do, for example, if we want to check that we have a correct delay, we can do say 10:05.360 --> 10:08.290 that print l.n. with the delay. 10:08.520 --> 10:17.730 So what I encourage you to do as you progress in your project is to use the cell to debug your application 10:18.030 --> 10:18.920 as you progress. 10:19.350 --> 10:20.150 So here I have. 10:20.160 --> 10:22.730 But first, the sale you can see with the distance. 10:22.740 --> 10:23.970 No, I comment the line. 10:23.970 --> 10:24.860 I don't remove it. 10:24.870 --> 10:30.270 OK, I just commented in case I have a problem, I can just increment it and check again. 10:30.540 --> 10:32.240 No, I'm going to do the same thing here. 10:32.250 --> 10:38.940 Check if I have the correct delay and once it's done, I would just comment that line and no, let's 10:38.950 --> 10:43.080 upload the code and let's so let's name it. 10:43.830 --> 10:45.990 Final project step two. 10:51.000 --> 10:55.500 And I'm going to to send money to all sorts of debris at the same time to see what's happening, and 10:55.500 --> 10:58.800 you can see we have a blink rate here. 10:59.100 --> 11:02.650 The blink delay is five hundred forty something, OK? 11:02.800 --> 11:11.310 And if I put my hand closer here, you can see it really going down and the closer I get to the address 11:11.310 --> 11:11.760 to an extent. 11:11.790 --> 11:15.450 So the fastest the will blink. 11:15.480 --> 11:19.860 OK, I go back to it, you can see we blink. 11:21.060 --> 11:30.120 Let's fast I go close, we being fast, I remove my hand and we go back to the previous blink rate. 11:33.110 --> 11:35.490 All right, so that is the end of Stepto.