1 00:00:00,690 --> 00:00:05,620 Hi and welcome to a new section in this course in this lecture. 2 00:00:05,640 --> 00:00:12,000 I'm going to talk about timers, in particular the hardware timers that are available to you via Micro 3 00:00:12,010 --> 00:00:19,050 Python, and they are implemented in hardware in the E.S.P 32 later in this section. 4 00:00:19,050 --> 00:00:25,590 And what we're going to talk about other capabilities that are embedded in the HP 32 and you can use 5 00:00:25,590 --> 00:00:31,680 them through micro python, such as, for example, the ability to control the C.P.U clock of your E.S.P 6 00:00:31,680 --> 00:00:40,560 32 to access the integrated whole effect sensor and the raw temperature sensor that gives you information 7 00:00:40,560 --> 00:00:42,050 about how hot your is. 8 00:00:42,090 --> 00:00:50,460 B 32 is running how to put your ESB 32 into deep sleep, which is great if you're building a battery 9 00:00:50,460 --> 00:00:53,430 powered gadget and things of that sort. 10 00:00:53,850 --> 00:00:59,640 In this first lecture of this section, as I mentioned already, I'm going to demonstrate how you can 11 00:00:59,640 --> 00:01:06,270 use the hardware timers that are integrated into your E.S.P to every scene. 12 00:01:06,270 --> 00:01:13,350 How to use at least one of those times in previous lectures has assured you, for example, how to control 13 00:01:13,350 --> 00:01:21,600 in ality using a timer instead of using an infinite loop or other types of loops just to begin with. 14 00:01:21,690 --> 00:01:27,510 You can have a look at the documentation right here in the macro Python website. 15 00:01:27,510 --> 00:01:30,540 And I'm looking at quick reference for the E.S.P 32. 16 00:01:30,540 --> 00:01:36,540 And the time is that's where you learn that the E.S.P 32 comes with four hardware. 17 00:01:36,540 --> 00:01:44,850 Time is integrated and the way to use them is to import the time a module from the machine module and 18 00:01:44,850 --> 00:01:46,830 then set them up like this. 19 00:01:47,090 --> 00:01:52,820 You indicate through the perimeter here of the time a module which time it is that you want to use in 20 00:01:52,830 --> 00:02:00,930 a to in a day from zero to three, and then you initialize the time you need to indicate the period 21 00:02:01,470 --> 00:02:06,150 and then the type of mode that you want to set the timer for. 22 00:02:06,160 --> 00:02:08,220 So either a one short time. 23 00:02:08,280 --> 00:02:11,780 So this is going to fire once or periodic in this case. 24 00:02:11,820 --> 00:02:15,690 This time it's going to fire every 2000 milliseconds, every two seconds. 25 00:02:16,110 --> 00:02:20,610 And then what is it that you want to do in particular? 26 00:02:20,610 --> 00:02:25,650 What kind of functions would you like it to call once the time expires? 27 00:02:26,010 --> 00:02:35,850 You can either use a lambda lambda is simply a tiny function that you can embed into the parameter itself, 28 00:02:36,180 --> 00:02:40,530 or alternatively, you want to go for something more traditional and classic. 29 00:02:40,530 --> 00:02:49,770 You can set a interrupt service routine like I've done here, which is just a regular function that 30 00:02:49,770 --> 00:02:52,480 is being called when the timer expires. 31 00:02:53,220 --> 00:02:57,820 So as I said, you can use up the full timers in my example. 32 00:02:57,840 --> 00:03:06,600 So what I do wish to use and IGB ality, which contains three component abilities in the same package, 33 00:03:06,600 --> 00:03:07,950 red, green and blue. 34 00:03:08,070 --> 00:03:11,250 And you see, I've set that up on my breadboard. 35 00:03:11,490 --> 00:03:21,750 I've got the red segment connected to Tapio 21, the blue segment connected to Jhpiego 22 and the green 36 00:03:22,140 --> 00:03:25,200 connected to your twenty one a23 sorry. 37 00:03:25,920 --> 00:03:35,820 And I have set up three hardware timers, each one set up to have a slightly different period. 38 00:03:36,120 --> 00:03:42,630 So you can see that the first one here I did zero time sensitive period of 250 milliseconds and when 39 00:03:42,630 --> 00:03:51,210 that expires it will call the red blink itself, which is this method right here or this function right 40 00:03:51,210 --> 00:03:51,510 here. 41 00:03:51,780 --> 00:03:58,380 Then time, although the a slightly different period, 350 milliseconds that's going to call the blue 42 00:03:58,380 --> 00:04:00,840 blink ISO, which is right here. 43 00:04:01,080 --> 00:04:04,770 And finally, the last one is timer with ID Editta. 44 00:04:05,100 --> 00:04:11,490 It's got a period of four hundred and fifty milliseconds and that's going to call the green blink guess 45 00:04:11,730 --> 00:04:12,750 which is right here. 46 00:04:12,760 --> 00:04:16,170 And those will just simply turn the lights on and off. 47 00:04:16,650 --> 00:04:21,960 And because the period is slightly off compared to each other, I'm getting some interesting effects 48 00:04:21,960 --> 00:04:25,440 that I think make the end result quite interesting. 49 00:04:25,990 --> 00:04:32,250 But the point here is that I've got three independent timers and each one, when it expires, it will 50 00:04:32,250 --> 00:04:40,650 call its own interrupt service routine and it will control your independently of all the others. 51 00:04:41,070 --> 00:04:42,720 You could add one more here. 52 00:04:42,730 --> 00:04:46,620 They could have a total of four hundred titles.