1 00:00:00,720 --> 00:00:06,510 Hi and welcome to a new section in this course, in this section, you learn how to use a variety of 2 00:00:06,570 --> 00:00:13,350 senses, typical senses that you are unlikely to want to connect to your especially to start starting 3 00:00:13,350 --> 00:00:20,010 this lecture with a look at the THC 22, since this is so not only is very popular, obviously you probably 4 00:00:20,010 --> 00:00:28,590 have one in your choice already, but also because the ability to moderate Python firmware already comes 5 00:00:28,740 --> 00:00:30,870 with a driver for this sensor. 6 00:00:30,870 --> 00:00:35,130 So there's nothing else that you would need to import or to install. 7 00:00:35,610 --> 00:00:41,150 And therefore it makes it a very good choice for it being our first sensor. 8 00:00:41,880 --> 00:00:47,510 So I have connected this sensor on my breadboard to remove it. 9 00:00:47,550 --> 00:00:48,690 We can take a closer look. 10 00:00:49,290 --> 00:00:54,450 So I've got my sensor looking at it from the front where the grill is. 11 00:00:54,900 --> 00:00:56,970 Number one is power. 12 00:00:57,120 --> 00:00:59,980 I've connected that to three point three volts power. 13 00:01:00,030 --> 00:01:03,900 To the other side you've got ground pin number. 14 00:01:04,350 --> 00:01:07,590 It goes to ground, of course, a pin number three. 15 00:01:07,620 --> 00:01:10,350 This one right here is not connected to anything. 16 00:01:10,350 --> 00:01:11,790 Just leave it floating. 17 00:01:12,120 --> 00:01:18,420 And then pin number to this pin is the pin that I have connected it by this jumper wire to chip here, 18 00:01:18,550 --> 00:01:21,450 four to one that I have connected it. 19 00:01:21,460 --> 00:01:22,830 Just knowledge that is. 20 00:01:24,450 --> 00:01:31,980 Not in 04, actually put in 18, so it's fixed it on the fly right there. 21 00:01:32,280 --> 00:01:40,760 OK, so I'm going to plug the sensor back on my breadboard and have a look at the sketch. 22 00:01:41,340 --> 00:01:45,230 Now, I've got some information on how to connect your sensor. 23 00:01:45,270 --> 00:01:49,370 He could use DHT 22 or DHT 11 for this experiment. 24 00:01:49,380 --> 00:01:56,390 Either one will work and the driver for either one is available in the market, both in firmware. 25 00:01:56,820 --> 00:01:59,550 I've got information about this right here. 26 00:01:59,600 --> 00:02:01,980 Might start with this. 27 00:02:02,670 --> 00:02:03,630 So go to this. 28 00:02:03,630 --> 00:02:04,260 You're real. 29 00:02:04,410 --> 00:02:07,680 And we'll take you to the micro python documentation. 30 00:02:08,160 --> 00:02:11,250 And I'm looking at the E.S.P three two quick reference. 31 00:02:11,250 --> 00:02:13,710 And down here you'll see the DHT driver. 32 00:02:14,160 --> 00:02:19,110 You can choose between the 11 or the two. 33 00:02:19,620 --> 00:02:25,710 Just tell it which pin your data pin is connected to, which Appio, you terrapin of the sensor it's 34 00:02:25,710 --> 00:02:31,350 connected to, and then you can take a measurement by calling the measure function and then you can 35 00:02:31,350 --> 00:02:38,260 read out temperature and humidity by calling the appropriately named functions very easy. 36 00:02:38,640 --> 00:02:48,510 So in my sketch, this looks like that I have imported the module, importing the PIN and Taimur functions 37 00:02:48,510 --> 00:02:49,900 from the machine module. 38 00:02:50,520 --> 00:02:53,790 This is where I create my DHT 22 object. 39 00:02:54,150 --> 00:02:59,360 And then as you've learned in previous lectures, I'm using a timer. 40 00:02:59,610 --> 00:03:04,050 I've given it a period of 5000 milliseconds or five seconds. 41 00:03:04,260 --> 00:03:08,850 Is this since I was quite slow and it's a couple of seconds to recover. 42 00:03:09,330 --> 00:03:11,480 Each call takes a couple of seconds to complete. 43 00:03:11,730 --> 00:03:15,840 So five seconds seems like a reasonable amount of time to wait before the next measurement. 44 00:03:16,290 --> 00:03:24,360 And every time this clock ticks or every time this clock expires, I call the take measurement ISO function 45 00:03:24,360 --> 00:03:28,170 right here, which calls the measure function. 46 00:03:28,170 --> 00:03:33,160 And then I'm putting out temperature and humidity like this very easy. 47 00:03:34,050 --> 00:03:36,570 So let's try this out. 48 00:03:37,510 --> 00:03:45,340 Right now, I'm looking at this script as stored on my computer file system, so I am going to save 49 00:03:45,340 --> 00:03:45,940 a copy. 50 00:03:46,960 --> 00:03:56,120 And you can see that my security is connected, but it does not appear in the final steps. 51 00:03:56,150 --> 00:03:57,880 I'm just going to click on Stop. 52 00:03:59,120 --> 00:04:04,940 To wake it up and make this connection, that's why I got confused, I thought that it was a connected, 53 00:04:04,940 --> 00:04:13,430 but it was so here I am going to now save a copy to the Michael Python device. 54 00:04:13,970 --> 00:04:18,440 And I use the same name, DHT p y. 55 00:04:19,960 --> 00:04:21,730 Let's try this with lower case. 56 00:04:25,930 --> 00:04:26,290 OK. 57 00:04:28,360 --> 00:04:29,110 And. 58 00:04:30,350 --> 00:04:30,770 Play. 59 00:04:34,400 --> 00:04:35,530 Wait for five seconds. 60 00:04:36,960 --> 00:04:39,840 And there's a first measurement appears here. 61 00:04:42,090 --> 00:04:42,640 Right. 62 00:04:44,070 --> 00:04:46,050 Out of curiosity, let's see if the plot works. 63 00:04:56,580 --> 00:05:03,310 So the plot doesn't work because it can't figure out the values here that are coming out. 64 00:05:04,000 --> 00:05:12,510 I'm just going to turn this off and stop the execution and stop putting. 65 00:05:14,200 --> 00:05:16,150 And I'm just going to move. 66 00:05:18,610 --> 00:05:23,830 The values that save. 67 00:05:25,250 --> 00:05:26,380 And start again. 68 00:05:35,800 --> 00:05:41,210 Medicare now the employer can show the two values, GraphicLy. 69 00:05:45,150 --> 00:05:50,160 Of course, I'm just sending through the numbers instead of numbers, followed by the symbol of the 70 00:05:50,160 --> 00:05:54,940 value, I'm going to play around with a product as well in a later lecture. 71 00:05:54,960 --> 00:05:57,030 Well, we'll have a look at the accelerometer. 72 00:05:58,080 --> 00:05:59,040 All right, good. 73 00:05:59,070 --> 00:06:06,380 I'm going to put the symbols for the units back because that's how I'd like to keep my sketch. 74 00:06:06,420 --> 00:06:06,710 Right. 75 00:06:07,890 --> 00:06:13,950 So this was quite easy, as you can see, because the driver is part of the firmware. 76 00:06:14,370 --> 00:06:17,610 In the next lecture, I'll show you how to use the BMY. 77 00:06:17,610 --> 00:06:24,840 Two hundred and eighty cents, which requires an external driver for this to something to show you how 78 00:06:24,840 --> 00:06:28,020 to find and install this driver before you can use.