WEBVTT 00:00.210 --> 00:06.240 This is the solution of the previous activity where you need to make three, it is being in a certain 00:06.240 --> 00:08.490 way and then change the current state. 00:08.490 --> 00:14.760 And if the president is pressed, you just stop the sequence and then you resume when the push button 00:15.030 --> 00:16.100 is not pressed anymore. 00:16.530 --> 00:21.270 So I'm going to first initialize all the things here. 00:21.600 --> 00:26.940 We've defined the one in which is number 12. 00:28.530 --> 00:31.500 And the two in number 11. 00:34.000 --> 00:43.510 And being which is number 10 and then we have we are going to use the push button to button. 00:44.560 --> 00:48.310 Dean, which is on digital being number two. 00:49.430 --> 00:51.350 OK, so we have our full. 00:52.390 --> 01:00.910 Things right here, so not in the set of what we can do is initialise we've been moved, so I'm going 01:00.910 --> 01:03.400 to initialize the Berlanti first. 01:04.900 --> 01:14.440 We have an input Motoki, because we are going to read from that thing because this is essential and 01:14.440 --> 01:22.750 then the buying mode for the one in which is output and I'm going to do the same. 01:24.090 --> 01:26.510 For eighty two, end the. 01:27.870 --> 01:31.530 Treat it as well as initialise. 01:32.610 --> 01:37.820 State property one below. 01:38.920 --> 01:39.580 And then. 01:41.050 --> 01:42.230 Two and three. 01:43.650 --> 01:44.830 But we have our city. 01:45.480 --> 01:49.840 OK, so nothing really new here and now in the ocean. 01:50.010 --> 01:51.720 I'm going to remove all that. 01:52.200 --> 01:55.820 I'm going to make the first state of the blink. 01:55.950 --> 02:04.200 OK, so digital rights, any one in will be high, OK? 02:04.650 --> 02:05.190 The. 02:07.090 --> 02:13.120 So the energy to will be low and then the. 02:14.550 --> 02:17.670 Digital right, Eighty-three? 02:19.140 --> 02:24.330 Will be high, so we have high, low and high. 02:26.550 --> 02:36.870 And then so this is a typical link, we use a delay of three hundred milliseconds and then we can simply 02:36.870 --> 02:38.130 say, I'm going to just. 02:39.880 --> 02:46.060 This isn't just in this state low. 02:47.560 --> 02:47.870 I. 02:49.980 --> 02:54.240 And and then, of course, we need to wait another three hundred. 02:55.470 --> 03:00.750 Milliseconds, OK, because the program will simply go from there to the beginning of the loop. 03:01.090 --> 03:08.820 OK, but if we don't use the delay this we can CDC to directly go back to the state. 03:09.240 --> 03:09.620 All right. 03:09.630 --> 03:11.780 So the brink is finished. 03:12.210 --> 03:14.850 That is the first step of this mini project. 03:15.260 --> 03:20.080 But now how are we going to stop that from the president? 03:20.670 --> 03:27.890 Well, we would need, of course, to use the digital read function we've done. 03:29.880 --> 03:31.530 So that is for sure. 03:31.560 --> 03:34.760 So we need to use that to get the state of the button. 03:35.130 --> 03:39.990 And now, because we want to check if the push button is pressed, then we are going to use and if. 03:41.310 --> 03:48.370 If digital read button thing is equal with two equal signs, they're important, too. 03:48.800 --> 03:51.170 I think if the president is priced. 03:52.290 --> 03:54.510 Then what we are going to do? 03:55.470 --> 03:57.570 Is, well, simply nothing. 03:57.720 --> 03:59.730 OK, and it's. 04:01.820 --> 04:05.150 Let's put that here in the end. 04:05.160 --> 04:11.870 So if you copy and paste in a block, the indentation may be wrong, so you just fix it. 04:11.870 --> 04:19.880 So, for example, I select all of that and I press dub once and it automatically adds to notation, 04:20.150 --> 04:22.670 which is much nicer to read. 04:23.460 --> 04:27.620 But what we do here in the program is we check everything into the loop. 04:27.990 --> 04:31.310 We check if the button is pressed, if we do nothing. 04:31.850 --> 04:34.760 And if the button is not pressed, we execute the. 04:35.690 --> 04:41.870 And the first thing you may have noticed here is that instead of doing if this condition is true, we 04:41.870 --> 04:42.920 do nothing else. 04:42.920 --> 04:45.380 We do something we can directly check. 04:46.620 --> 04:52.140 If the growth is low and then we simply do the blink. 04:53.020 --> 04:57.240 And well, the reason is because we don't do anything else. 04:57.930 --> 05:04.840 So here we are only going to enter the look of code and we are only going to make the editors blink 05:05.020 --> 05:10.900 when the push button is not pressed because so whenever the push button is priced, we simply don't 05:10.900 --> 05:12.060 enter this book of code. 05:12.550 --> 05:19.000 And then you might see another problem is that so if the pushbutton is not pressed, which we are going 05:19.000 --> 05:20.590 to do is to we enter that. 05:20.590 --> 05:22.900 If so, we make the error. 05:22.900 --> 05:29.740 It is so high, low, high, and then the delete 300 segments and then it is low, high, low delay 05:29.740 --> 05:30.580 300 seconds. 05:30.760 --> 05:34.170 And then and only then we check the button again. 05:34.630 --> 05:40.690 So you will not be able to pull the program here between those two states. 05:41.350 --> 05:44.870 You will only be able to push the program after this date. 05:44.890 --> 05:50.620 So after we go back here, but not at this point, what are we can do here? 05:51.370 --> 05:57.840 Well, first, the maybe most obvious solution is we can split this into two. 05:57.870 --> 06:06.040 If so, I'm just going to finish the F here and add another, which is the exact same. 06:07.080 --> 06:07.980 It right here. 06:08.340 --> 06:09.930 So first we check. 06:11.170 --> 06:13.060 And actually, let's put a delay here. 06:15.810 --> 06:21.750 But we have two blocks of code that are saying, OK, but just with a different state, OK, for the 06:21.750 --> 06:27.540 bridge, the first we check, if the bottom is not priced, if the button is not pressed, then we just 06:27.540 --> 06:29.670 execute this eight of the. 06:30.420 --> 06:34.320 We wait for three hundred milliseconds and then we check again the button. 06:34.880 --> 06:41.000 So if let's say we executed this, but then we press the button, then this will not be executed. 06:41.430 --> 06:43.970 And then we come back and we continue to check it. 06:44.100 --> 06:48.450 But this is not a good solution because, well, you need to write the same structure twice. 06:48.900 --> 06:54.430 And then depending on when you press the push button, you may execute the same structure twice. 06:54.450 --> 06:57.080 So let's say you execute that one, OK? 06:57.420 --> 07:00.750 And you in this three hundred milliseconds, you press the button. 07:00.780 --> 07:03.770 So this will be false. 07:03.780 --> 07:07.880 And so we don't enter this book of code and then you continue to check at full speed. 07:07.890 --> 07:13.680 And then when you release the button, if this is the first line that gets executed, you are just going 07:13.680 --> 07:17.700 to execute that a second time instead of just going to the next one. 07:18.360 --> 07:26.400 So what I'm going to do is simply to use just one if but I'm going to check the state of the brain inside. 07:26.580 --> 07:34.350 If so, we are going to use a variable here that I'm going to make it global so we can create it here. 07:34.350 --> 07:35.880 We can use it in the loop. 07:35.880 --> 07:40.990 And because it is in a more global scope, the value will stay in the book. 07:41.130 --> 07:43.080 It just creates a viable in the loop. 07:43.320 --> 07:49.400 Every time we go out of the loop, the variable will be gone and then we can't keep the volume. 07:49.890 --> 07:57.810 So let's name it any linked states and just going to initialize it to let's say one. 07:58.080 --> 08:02.850 OK, let's say we have the state one and the state to. 08:05.100 --> 08:11.020 Let's just focus on that first issue, which will become the only if if the button is not pressed so 08:11.040 --> 08:20.040 we don't change that, then we are going to check if every state is equal to one. 08:21.780 --> 08:32.850 So that was, let's say the current state was one, what we do is we do think states is equal to two. 08:32.860 --> 08:34.620 So here we check. 08:35.680 --> 08:42.800 The value with to equal, so this will simply compared to value and return true, if this is correct, 08:43.130 --> 08:49.330 this is equal and here we assign a new value with just one equal to the state. 08:49.960 --> 08:52.820 So let's say that we are going to execute that first year. 08:52.960 --> 08:53.340 OK. 08:55.680 --> 09:02.400 So, Ellie, dimpling state one, we execute this and then we change the variable. 09:03.590 --> 09:11.150 To do so the next time we enter the look and the if, then the eligible state will not be equal to one, 09:11.150 --> 09:18.890 but to do so, we can use else and he could write as a state is equal to two. 09:18.890 --> 09:22.570 But because there is only two states we can just use as. 09:24.070 --> 09:25.960 And going to right now. 09:27.000 --> 09:27.990 This year. 09:31.280 --> 09:39.740 So the second state is the first state to second state and now I'm going to put any link, eight is 09:39.770 --> 09:41.180 equal to one. 09:42.230 --> 09:49.810 OK, and just remove all that and what I'm going to keep is the delay that I'm going to write the delay 09:49.940 --> 09:51.260 only once. 09:53.040 --> 09:56.560 And actually, we are missing a three bracket. 09:56.610 --> 09:58.890 OK, so make sure you have all the brackets. 09:59.160 --> 10:04.710 This is also a common error, is that you are missing a bracket and then you may have some errors that 10:04.710 --> 10:04.920 we have. 10:04.920 --> 10:09.870 The brackets here, you can see with the look and then the fist if they get them. 10:10.530 --> 10:18.430 This if from here to there and then else and then let's end the delay here is not inside this. 10:18.960 --> 10:22.280 This blog is inside the digital void. 10:22.330 --> 10:23.570 But look. 10:24.520 --> 10:30.310 So this court is, as you can see, much better because you will be able to pull the program between 10:30.340 --> 10:36.480 each state, OK, if you want, you can add other states, you can add more states easily. 10:36.490 --> 10:38.800 You just need to write delete one time. 10:39.100 --> 10:45.640 And this well, this is your first state mission in hardware for women. 10:45.640 --> 10:48.880 In Hunwick project, you would often see state machines. 10:49.180 --> 10:55.210 So basically you have available, which contains a state, OK, and then you check if the state is that 10:55.210 --> 10:59.770 particular state, you do one action and then you change the state to another one. 11:00.040 --> 11:05.470 The the next time you can tell if the state is different and you execute another action and every time 11:05.470 --> 11:07.540 you executive action, you change the state. 11:07.780 --> 11:09.580 So you change the action for the next time. 11:10.120 --> 11:13.900 OK, so to recap in the loop function, first we check for the state of the button. 11:14.170 --> 11:18.160 If the button is priced well, this is false or we don't do anything. 11:18.580 --> 11:25.690 If the button is not priced, we are going to execute the blink with either one of the two states, 11:25.690 --> 11:26.040 OK? 11:26.320 --> 11:30.490 And once we execute the state, then the next time it would be the other state. 11:30.790 --> 11:38.620 And after we execute the blink, we simply use the delay 300 to wait before we check the next time. 11:39.220 --> 11:42.730 And let's actually make this program combined here. 11:43.210 --> 11:44.230 I'm going to name it as. 11:45.210 --> 11:45.990 Activity. 11:49.730 --> 11:56.930 So let's check if we have any compañero and down company, so that seems to be good and now we're going 11:56.930 --> 12:02.360 to upload to connect your make sure it's connected, et cetera, upload code. 12:05.140 --> 12:08.000 And you can see the editors are blinking. 12:08.020 --> 12:14.440 So first one and three and then edit it to every three hundred milliseconds. 12:14.860 --> 12:18.290 So now is the text I'm going to press on the button. 12:18.880 --> 12:21.920 And as you can see here, the blink has stopped. 12:21.940 --> 12:26.280 I realize the president and the brain continues like. 12:28.190 --> 12:33.470 As the president, you can see now, it's already one and three it. 12:34.280 --> 12:39.530 Let's try to get you to win three again. 12:40.400 --> 12:45.260 And we had two so we can pull between each state of the black. 12:46.230 --> 12:48.530 All right, that's the end of this activity.