1 00:00:01,110 --> 00:00:05,430 In this lecture, you have to read the state of the commentary button. 2 00:00:05,940 --> 00:00:11,970 I'm going to show you how to do that, using three different examples each time to bring a different 3 00:00:11,970 --> 00:00:16,340 capability of the ECB through in macro python to achieve the same thing. 4 00:00:16,350 --> 00:00:21,710 But each time with a bit more efficiency across the three examples, the hardware is not going to change 5 00:00:21,870 --> 00:00:22,680 in all cases. 6 00:00:23,190 --> 00:00:26,560 Have the ECB three to have a momentary pattern. 7 00:00:26,590 --> 00:00:32,760 She can see that is connected to Jebril for this pin right here. 8 00:00:33,180 --> 00:00:42,480 And I am using the ECB 32 internal pull up so that I don't need to use an additional wire to bring up 9 00:00:42,480 --> 00:00:47,970 the unpressed state of the button to high would use the internal pull up register for that. 10 00:00:48,330 --> 00:00:56,370 And I also have a wire here that will bring the state of the button to know when it's pressed. 11 00:00:56,610 --> 00:01:03,750 So that's what will be detecting to show, in effect of the button press I've got in here, just like 12 00:01:03,750 --> 00:01:11,040 in the previous lectures that is connected to Tapio 21 and that's about it with a hardware. 13 00:01:11,700 --> 00:01:17,610 In the first example that I'll show you in this lecture, I am reading the state of the button in the 14 00:01:17,610 --> 00:01:20,840 simplest possible way by using an infinite loop here. 15 00:01:21,240 --> 00:01:29,220 So I'm using the while loop than a passing true as its permanent state so that the program is going 16 00:01:29,220 --> 00:01:31,410 to be locked inside this block. 17 00:01:31,830 --> 00:01:40,260 So constantly it will be using this instruction to read the value of the button and if it is low represented 18 00:01:40,260 --> 00:01:41,060 by zero here. 19 00:01:41,070 --> 00:01:49,080 So logical state is low because you can see that the pressed state of the button is pushed down to zero 20 00:01:49,080 --> 00:01:55,410 volts, then will turn the old on and will stay there for ten milliseconds. 21 00:01:55,440 --> 00:02:03,090 And if the state of the button is not zero, it's one because of the internal pull up then will turn 22 00:02:03,090 --> 00:02:12,750 the ability of a couple of other things in this sketch worth talking about, I have used this expression 23 00:02:12,750 --> 00:02:21,480 here to declare the object of the button and you can see that I'm using the PIN constructor, just like 24 00:02:21,480 --> 00:02:24,180 I did with a PIN constructor for the ality here. 25 00:02:24,180 --> 00:02:27,200 But in this case, I've got three arguments. 26 00:02:27,210 --> 00:02:28,910 The first one is the GPO. 27 00:02:29,310 --> 00:02:35,820 The second one indicates that this is going to be an input and then the third one activates the internal 28 00:02:35,820 --> 00:02:37,040 pull up front. 29 00:02:37,170 --> 00:02:46,470 To learn more about the PIN constructor, have a look at this link here, which will take you to this 30 00:02:46,710 --> 00:02:51,120 page in the quick reference for the HB three two or the Micro Python website. 31 00:02:51,630 --> 00:02:54,960 And it shows you an example of how to use these functions. 32 00:02:55,230 --> 00:03:01,110 And again, if you want even more information than good to have a look at the machine Dot Pincott, 33 00:03:01,530 --> 00:03:03,660 which is this page right here. 34 00:03:04,530 --> 00:03:05,130 This is it. 35 00:03:05,460 --> 00:03:08,130 And you can see the constructors in my example. 36 00:03:08,130 --> 00:03:15,660 I'm using this constructor here to create an object for idea of the Tapio number for in our case then 37 00:03:15,660 --> 00:03:20,280 for mode, I'm using Penkin as opposed to pin down for the elite. 38 00:03:20,310 --> 00:03:22,140 This opinion is for the button. 39 00:03:22,500 --> 00:03:28,230 And then we also have the polyposis, stuff like that. 40 00:03:28,230 --> 00:03:32,580 So Pincott pull up is a way to turn on the pull up resistor you can see. 41 00:03:32,580 --> 00:03:37,590 And like the other, you know, you can also have the pull down resistor if you use Pendo, pull down 42 00:03:38,520 --> 00:03:39,810 and that's about it. 43 00:03:39,810 --> 00:03:43,190 The rest can be immediate and they will just take the default values. 44 00:03:43,920 --> 00:03:49,500 Another new thing that I'm using here is the tick and the call and this function. 45 00:03:49,500 --> 00:03:51,690 You can see that I'm using that down here. 46 00:03:51,870 --> 00:03:54,420 I'm importing it from you time. 47 00:03:54,840 --> 00:04:00,410 So from Micro Python version of the time, I see Python module. 48 00:04:00,780 --> 00:04:04,680 So this function here, you can get more information about it right there. 49 00:04:04,950 --> 00:04:09,590 It gives us the number of milliseconds since we have power to up the speed. 50 00:04:09,600 --> 00:04:10,140 Three, two. 51 00:04:10,350 --> 00:04:16,160 And that's because we want to see information about the moment that I pressed on the button and I'm 52 00:04:16,170 --> 00:04:21,840 bringing out the number of milliseconds since the activity was powered up when I pressed the button 53 00:04:21,840 --> 00:04:22,430 right here. 54 00:04:23,700 --> 00:04:24,990 OK, let's try this out. 55 00:04:25,170 --> 00:04:31,820 So at the moment, I've noted the script from my computer disk and my computer file system. 56 00:04:31,830 --> 00:04:41,340 So what I do is to save a copy with the macro python device in the name will be Button and it's call 57 00:04:41,340 --> 00:04:43,710 for the API. 58 00:04:46,110 --> 00:04:53,520 All right, here it is and double click on it to bring it up, you know, close the window that contains 59 00:04:53,520 --> 00:04:56,970 the version of the script on the computer file system. 60 00:04:57,580 --> 00:05:01,320 You know that I've got the script selected on the E.S.P 32. 61 00:05:01,320 --> 00:05:03,060 I will play it. 62 00:05:05,400 --> 00:05:17,530 All right, to press the button, you it is one text comes through to the show of my Thony Editor Button 63 00:05:17,530 --> 00:05:22,720 pressed, and then the number of seconds when the button pressed, it's been detected. 64 00:05:25,080 --> 00:05:25,500 All right. 65 00:05:25,950 --> 00:05:30,220 Obviously, this is not a very efficient way, again, to use the hardware. 66 00:05:30,240 --> 00:05:38,820 So I want to show you two additional methods of the set of a button that do not involve using a wire, 67 00:05:39,090 --> 00:05:40,950 at least not to do the reading. 68 00:05:41,370 --> 00:05:46,050 So let's have a look at the next lecture where I'll show you how to do the exact same thing more efficiently 69 00:05:46,050 --> 00:05:48,200 using a hardware interactive.