WEBVTT 00:00.180 --> 00:03.180 This is that number nine of the final project. 00:03.470 --> 00:10.020 So instead we are going to allow the user to change the distance you need to between centimeters and 00:10.020 --> 00:16.430 inches so the user will be able to toggle between the two using the remote controller. 00:16.890 --> 00:23.550 And then what we also want to do is to make sure that we save the default unit for the next time we 00:23.550 --> 00:24.550 restart the program. 00:24.870 --> 00:29.190 So the default unit is centimeters and will restart its centimeters. 00:29.490 --> 00:34.730 If the default unit is inches and then we restart, then the default unit will be inches. 00:34.740 --> 00:36.570 And for that we are going to use EPROM. 00:36.600 --> 00:45.120 So for this step three small thing we need to do first go the distance units using the remote controller, 00:45.420 --> 00:50.340 then print of course, to create a unit on the LCD and save it to April. 00:51.060 --> 00:53.480 So let's start by defining here. 00:53.490 --> 00:55.800 I'm going to add some define. 00:57.800 --> 01:03.400 Define distance, you need centimeter. 01:03.510 --> 01:04.830 I'm going to use some define. 01:04.850 --> 01:14.030 OK, let's put here the value is really not important defined distance unit and let's put in four inches. 01:15.080 --> 01:20.720 So by doing this, you can see that if you want to add, for example, in the future another unit that 01:20.870 --> 01:21.860 you want to print in. 01:21.860 --> 01:22.820 Mm. 01:22.820 --> 01:28.490 In meters, in feet, in whatever unit you can just add multiple defines you. 01:28.730 --> 01:37.520 OK, and I'm going to create a global variable, let's put it there after is looked into this dense 01:38.030 --> 01:42.720 unit and initialize it to distance units centimeters. 01:42.740 --> 01:48.050 So that would be the default unit when you first start the program for the first time. 01:48.380 --> 01:54.520 And actually one note here is that we aren't going to change the computations to inches in the program. 01:54.890 --> 01:56.470 We keep centimeters. 01:56.960 --> 01:59.240 We will use centimeters for all computations. 01:59.240 --> 02:05.540 And then only then when we want to print on the LCD, we are going to toggle between the two units. 02:05.930 --> 02:08.760 So I'm going to create now a new function. 02:08.780 --> 02:10.530 So let's go down. 02:10.550 --> 02:13.630 So we have a handle I command. 02:13.640 --> 02:15.060 I'm going to create the function here. 02:15.440 --> 02:17.930 So the other here, not that important. 02:20.890 --> 02:23.710 Distance unit, OK? 02:25.270 --> 02:26.530 And I'm going to if. 02:28.810 --> 02:32.560 Distance you need is equal to. 02:32.830 --> 02:37.480 So let's go back here to the distance, you need centimeters. 02:40.680 --> 02:47.640 Then we say that the distance you need becomes inches and then else. 02:50.690 --> 02:52.240 Distance you need. 02:54.130 --> 02:59.440 Becomes it, so we just toggling between the two and note that here. 02:59.470 --> 03:06.130 So with this, you may recognize the opportunity to use the one line, if which you may do so if you 03:06.130 --> 03:07.320 only have two states. 03:08.020 --> 03:14.490 And the thing is, I'm not using that here because maybe we can in the future add other units. 03:14.770 --> 03:21.290 And also, if you add other units in the future, that may be also a good idea to change that if as 03:21.380 --> 03:23.910 if as into a switch. 03:23.950 --> 03:30.290 OK, but I'm going to give that if elsea because it's also convenient, basically switch and if you 03:30.310 --> 03:31.950 are doing the exact same thing. 03:32.320 --> 03:36.970 So I'm just toggling between the centimeter and inches when I call this. 03:37.360 --> 03:42.000 So what I can do now is I have chosen the ECU button. 03:42.010 --> 03:42.990 So why BQ? 03:43.030 --> 03:44.020 Well, why not? 03:44.320 --> 03:48.700 So when I press on the ECU button, I toggle the distance unit. 03:48.740 --> 03:51.910 So if it was centimeters, it's going to be inches. 03:52.240 --> 03:57.550 If it was inches is going to be centimeters and the first default value is centimeters. 03:58.130 --> 04:04.480 Now that we have toggled distance unit, we need to make sure that we print the correct unit on the 04:04.480 --> 04:05.710 LCD screen. 04:05.920 --> 04:07.720 So when we print here. 04:09.260 --> 04:13.790 This OK, and then dist. centimeters, I'm going to add it if you. 04:15.570 --> 04:22.830 Distance unit is equal to so actually distance units centimeters. 04:24.430 --> 04:26.530 Let's use inches here instead. 04:27.580 --> 04:35.530 And say footprints in inches and the default so else will be the default behavior and a default will 04:35.530 --> 04:36.460 be centimeters. 04:37.700 --> 04:41.160 Just like centimeters in the default unit. 04:41.180 --> 04:43.310 So that will make things simpler. 04:43.820 --> 04:46.570 So if it's in inches, we're going to break in inches. 04:46.590 --> 04:55.070 And so if it's in centimeters now, because we only have two units, we print the distance centimeters, 04:55.070 --> 04:58.360 everything like we did before, quite normal. 04:58.490 --> 05:06.740 Now, what we need to do here, the print we would need to convert the distance that we have here. 05:08.300 --> 05:15.590 From centimeters to inches distance that we would need to multiply by something and what are we to do 05:15.590 --> 05:17.270 here to make it easier? 05:17.300 --> 05:27.700 I'm going to add another here, a define and call this centimeter two inches. 05:27.710 --> 05:30.010 So just like this, for example. 05:30.350 --> 05:39.150 And then I'm going to put the conversion factor, which is zero point three nine three seven one. 05:39.560 --> 05:40.850 Where did I get that? 05:40.850 --> 05:46.430 Will simply nutile centimeters, two inches in Google and you get that result. 05:46.850 --> 05:53.390 So I just stop right here so I can just instead of hard cutting this number. 05:54.610 --> 05:59.230 I can just do in my print the. 06:00.280 --> 06:07.580 Function again, the distance multiplied by centimeters, two inches, and this is actually a good practice, 06:07.610 --> 06:14.380 OK, when you need to convert between units, for example, you could have degrees and Rajan's for an 06:14.380 --> 06:14.860 angle. 06:15.160 --> 06:23.800 You could have sensors are finite for a temperature or here inches or centimeters or millimeters or 06:23.800 --> 06:26.770 whatever, then just creates and defines. 06:26.920 --> 06:34.420 OK, first you need to Sigrun you need and then you just need to multiply by these defined which makes 06:34.420 --> 06:35.540 more sense in your program. 06:35.560 --> 06:36.820 OK, it's much more reading. 06:38.060 --> 06:39.620 And then we do ethnic prince. 06:41.270 --> 06:49.110 With space and endless put in and a few other species, right, so now we can toggle the unit, we can 06:49.110 --> 06:53.460 print a different result on the acidy depending on the unit. 06:53.880 --> 07:01.410 And the thing is not if we restart the ALINO program and if it was inches, then when we restart, it's 07:01.410 --> 07:07.020 going to still be the default value, which is right here. 07:08.170 --> 07:10.790 Distance units in distance units centimeters. 07:11.590 --> 07:14.810 So what I'm going to do now is to save. 07:14.830 --> 07:23.170 So when we told you when we took out the distance units, I'm going to save that new distance unit into 07:23.170 --> 07:23.750 April. 07:24.130 --> 07:29.310 And when we start the program in the set up, I'm going to read that unit. 07:29.650 --> 07:35.060 So I'm going to insulate it from here, include people. 07:36.460 --> 07:42.310 All that locate and after all those designs, I'm going to add here. 07:43.690 --> 07:47.200 Define EPROM address. 07:48.770 --> 07:56.380 Distance unit, I'm going to create define for, let's say, 50, so we are going to use the address 07:56.450 --> 08:00.320 50 of the EPROM to store the distance unit. 08:00.890 --> 08:04.310 OK, so what we do in the Tuggle. 08:06.180 --> 08:08.280 Distance unit, I'm going to do. 08:09.420 --> 08:16.920 Is that right, we've addressed that we have so the address is here. 08:19.820 --> 08:23.360 It's right here and distance. 08:25.430 --> 08:33.530 OK, note that because we use EPROM, that's right, what you might want to do is to use Assael, not 08:33.560 --> 08:39.890 print here, run the program first and see when you get to that point, OK? 08:40.400 --> 08:45.500 If you only get to the point when you press on the button on the remote control, that's fine. 08:45.800 --> 08:51.190 But if you have a problem and this is called very, very, very frequently and you want to check before 08:51.200 --> 08:54.080 you're right on the problem, so I'm not going to do it. 08:54.080 --> 08:58.710 But that's a good practice you can do before you're right with EPROM, right. 08:59.030 --> 09:06.400 So I have saved my value when I toggle the distance unit, not in the setup, what I can do simply. 09:06.830 --> 09:08.800 So let's do that here, for example. 09:09.230 --> 09:11.030 It's not really important the way you do it. 09:12.230 --> 09:15.080 I can do distance unit. 09:16.090 --> 09:21.460 Is equal to promote trade with the onerous. 09:22.640 --> 09:29.480 And just I'm going to make sure that even a distance unit is equal to 255, which can happen. 09:31.340 --> 09:34.100 And the distance unit becomes. 09:35.190 --> 09:35.880 Zero. 09:35.910 --> 09:42.340 I'll just make sure that it is the distance in each 30 meters. 09:43.920 --> 09:44.970 So when you read from the. 09:49.350 --> 09:56.600 You also want to validate the data in case you have a written invalidated before he undoing the simple 09:56.600 --> 09:59.580 logic and checking for the two hundred fifty five value. 09:59.980 --> 10:07.770 But what you may also do is check for each dist. unit that you have that corresponds to one. 10:07.920 --> 10:12.780 And if it doesn't correspond to any of the distance unit, you can use the default one. 10:13.170 --> 10:13.480 OK. 10:13.500 --> 10:15.720 So no, I think the code is complete. 10:15.730 --> 10:18.420 So let's first verify it. 10:19.590 --> 10:21.600 Final project, Stepanov, the nine. 10:24.370 --> 10:27.070 OK, and as a quick recap, so. 10:29.100 --> 10:35.880 We create toggle distance unit function that we call when we pressed the ECU button on the remote control. 10:36.990 --> 10:43.710 In that we toggle between the two different distance units, centimeter inches that we have used. 10:44.070 --> 10:51.750 So we have created a defined for each and the global viable to keep the distance unit once we toggle 10:52.110 --> 10:52.810 the unit. 10:52.860 --> 10:55.520 We also write it to the people. 10:55.920 --> 11:01.350 Then when we print on the LCD, when we call that function within a distance, we're going to check 11:01.350 --> 11:02.560 for the distance unit. 11:02.580 --> 11:05.580 If this is inches, we print in inches. 11:05.790 --> 11:08.530 If it's centimeters, we print in centimeters. 11:08.910 --> 11:11.280 Now, let's say you restart the program. 11:12.090 --> 11:18.900 Now, in the setup, you're going to read from the address for the distance unit and sits the distance 11:18.900 --> 11:24.720 unit with the previous setting that you have set when you press the button in the previous frame. 11:24.930 --> 11:25.320 All right. 11:25.320 --> 11:28.290 So now let's upload to the original. 11:31.720 --> 11:37.330 So now you can see the distance in centimeters, of course, that's the normal behavior we always had 11:37.330 --> 11:37.940 before. 11:38.230 --> 11:44.470 So 136 centimeters now going to press on the issue button here. 11:47.560 --> 11:55.510 And so I had a low battery, so you can see that sometimes if you have low battery and the remote controller, 11:55.750 --> 12:01.760 it may be some source of problem that the command is not correctly retrieved. 12:01.990 --> 12:03.620 So now I have injuries. 12:03.760 --> 12:10.490 You can see 135 centimeters correspond to about 50, 50 something inches. 12:10.510 --> 12:14.830 OK, I can toggle between centimeters and. 12:16.090 --> 12:20.640 And cheese, and you can see that if I it so I'm going to press the reset button. 12:22.080 --> 12:25.740 Which will restart the program, initializing its inches again. 12:25.770 --> 12:32.310 OK, it's not centimeters, it's inches because we have saved the unit in the memory. 12:33.150 --> 12:35.950 All right, so everything is working now. 12:35.970 --> 12:42.930 You can choose the distance need you want to print the distance on the LCD screen for the user, which 12:42.930 --> 12:44.220 can be quite convenient. 12:44.640 --> 12:50.280 And you can see here, again, that is a really good use case for using it from memory.