1 00:00:00,660 --> 00:00:07,050 In this lecture, I'll talk about the hard work requirements for this project in choosing hardware components, 2 00:00:07,080 --> 00:00:10,260 I prioritize the flexibility and simplicity. 3 00:00:10,800 --> 00:00:16,530 It should be possible to substitute any of the components with equivalence and still be able to complete 4 00:00:16,530 --> 00:00:19,050 the project without modifications in the software. 5 00:00:19,860 --> 00:00:24,420 I also chose components that are easy to find no matter where you are in the world. 6 00:00:25,020 --> 00:00:30,210 Almost everything I show you in this lecture is generic, meaning that you can get parts from different 7 00:00:30,210 --> 00:00:32,370 ventus at very low costs. 8 00:00:33,000 --> 00:00:38,670 The only exception is the Raspberry Pi, for which there is no 100 per cent compatible alternative to 9 00:00:38,670 --> 00:00:39,690 the genuine board. 10 00:00:39,930 --> 00:00:42,180 But even there, the alternatives. 11 00:00:43,650 --> 00:00:49,830 Of course, you'll need a Raspberry Pi, any model will do as long as it includes ADENHART or Wi-Fi 12 00:00:49,830 --> 00:00:56,820 networking, and you can install the Raspberry Pi OS on it from a ten dollar Raspberry Pi zero w to 13 00:00:56,820 --> 00:00:59,390 the latest Raspberry Pi for the work. 14 00:01:00,270 --> 00:01:02,690 I have used an old Raspberry Pi to. 15 00:01:03,090 --> 00:01:07,710 Having said that, you actually do not need a Raspberry Pi at all. 16 00:01:08,220 --> 00:01:14,400 At the very least, you need a computer on which you can store and run the node rate and make it mosquito 17 00:01:14,430 --> 00:01:15,120 services. 18 00:01:15,750 --> 00:01:21,990 It could be a laptop or a virtual machine with the Knicks running on your computer or a banana pie, 19 00:01:21,990 --> 00:01:28,710 perhaps AAUP to square red and or droid x2 for or an imagination creator. 20 00:01:28,710 --> 00:01:29,750 S.I 20. 21 00:01:30,300 --> 00:01:37,500 As I said, the only real requirement is that whatever you choose, it can run the node red and disservices. 22 00:01:38,610 --> 00:01:44,370 If you choose to use anything other than the Raspberry Pi, you'll have to figure out how to install 23 00:01:44,370 --> 00:01:45,810 those services yourself. 24 00:01:46,110 --> 00:01:48,780 But if you are comfortable with that, go for it. 25 00:01:50,210 --> 00:01:55,850 The microcontroller I've chosen for this project is that E.S.P 32 implemented on a generic development 26 00:01:55,850 --> 00:02:03,410 kit version one point one, I chose the E.S.P 32 as opposed to a regular Arduino like the UNO because 27 00:02:03,410 --> 00:02:04,820 of the integrated Wi-Fi. 28 00:02:05,690 --> 00:02:15,290 The one that I use is marked E.S.P 32 s the onepoint wonderful version, one point one and has 38 pins 29 00:02:15,290 --> 00:02:19,550 with a pitch between the two rows of twenty two point ninety five millimeters. 30 00:02:19,880 --> 00:02:22,870 And I chose it because it fits nicely on my breadboard. 31 00:02:22,880 --> 00:02:29,160 There's no other specific reason I've tested the exact same sketch on a few other, especially two deaf 32 00:02:29,180 --> 00:02:36,590 kids that I have, such as a 40 pin and 30 pin variant, including one with an integrated LEPO battery 33 00:02:36,590 --> 00:02:38,150 and charging circuit. 34 00:02:38,480 --> 00:02:39,800 And that worked perfectly. 35 00:02:40,250 --> 00:02:47,900 I also tested a modified version of the sketch with an Arduino Nano 33 Iot, and it worked equally well. 36 00:02:48,740 --> 00:02:52,750 As with the Raspberry Pi, the choice of Mac Montrealer is flexible. 37 00:02:52,970 --> 00:02:59,150 The only requirement is that the controller you choose has Wi-Fi or Ethernet communication capability, 38 00:02:59,420 --> 00:03:03,050 and it has an M Quiddity library so that it can work. 39 00:03:03,060 --> 00:03:04,820 Sanctity client. 40 00:03:05,940 --> 00:03:11,370 As with the Raspberry Pi, if you choose to use anything other than the E.S.P 32, you'll have to figure 41 00:03:11,370 --> 00:03:14,840 out how to modify the sketch to work with your choice of MCU. 42 00:03:15,180 --> 00:03:17,700 So I encourage you to go with the ESB 32. 43 00:03:18,780 --> 00:03:24,090 In the photo that you see in this slide, you can see all of the hardware components that are needed 44 00:03:24,090 --> 00:03:32,580 in this project, apart from the Raspberry Pi and the added to this, a motor at DHT 22 sensor, a potential 45 00:03:32,580 --> 00:03:36,350 mirror and a few other things that I'll describe later here. 46 00:03:36,360 --> 00:03:42,570 I want to concentrate on the motor and the potential motor because I don't want to be working on the 47 00:03:42,570 --> 00:03:50,520 project with that terrarium jar or filled with soil and a plan in it and a water reservoir on my workbench. 48 00:03:50,880 --> 00:03:57,750 I've replaced the actual soil humidity sensor with a potential mirror and the actual water pump motor 49 00:03:58,020 --> 00:04:00,480 with a regular Hoby DC motor. 50 00:04:01,290 --> 00:04:07,140 The potential motor is simulating the analog soil humidity sensor so I can develop the software and 51 00:04:07,140 --> 00:04:11,640 test that without having to deal with the actual planned soil and water. 52 00:04:12,390 --> 00:04:17,910 The this motor allows me to test the motor control circuitry and the motor power supply. 53 00:04:18,870 --> 00:04:25,140 Once I'm confident that those individual software and hardware components work, then it can replace 54 00:04:25,140 --> 00:04:31,200 the potential motor and the DC motor with the actual soil humidity sensor and the water pump. 55 00:04:32,800 --> 00:04:37,810 In the photos, in this light, you can see the actual water pump on the left and this soil humidity 56 00:04:37,810 --> 00:04:44,350 sensor on the right side, both very low cost generic components that you can easily find on the Web. 57 00:04:44,680 --> 00:04:47,410 So I suggest that you purchase at least two of each. 58 00:04:48,870 --> 00:04:57,420 I'm using a regular DHT 22 sensor in a special package with extended wires for the power and data pins 59 00:04:57,630 --> 00:04:59,410 like the ones you see in this photo. 60 00:05:00,330 --> 00:05:05,240 The special packaging makes it easy to place the sensor inside the terrarium container. 61 00:05:06,000 --> 00:05:10,260 Apart from this, there's nothing special about this DHT 22. 62 00:05:10,710 --> 00:05:13,890 You can actually use a regular DHT 22. 63 00:05:13,890 --> 00:05:20,480 And so the long, flexible jumper wires to its pins so that you can place it inside your terrarium container 64 00:05:20,490 --> 00:05:23,960 instead of purchasing the modified version in this photo. 65 00:05:25,250 --> 00:05:33,140 To control the pump motor, I've chosen to use a tip 120 122 Darlington transistor, along with a network 66 00:05:33,140 --> 00:05:36,960 of two resistors, one diode and one capacitor. 67 00:05:37,820 --> 00:05:43,040 This configuration allows me to switch the motor on and off with only a small amount of Charente from 68 00:05:43,040 --> 00:05:46,020 the E.S.P 32 instead of a transistor. 69 00:05:46,160 --> 00:05:52,130 You can choose to use a relay which can help with better electrical separation between the motor and 70 00:05:52,130 --> 00:05:53,090 the microcontroller. 71 00:05:54,140 --> 00:05:57,890 In this case, I'll show you how to implement the transistor switch option. 72 00:05:59,440 --> 00:06:04,880 I wanted to implement the ability to measure the input voltage of the ISP 32 and the motor. 73 00:06:05,290 --> 00:06:12,760 This makes it possible to power the terrorism controller from one or two batteries and to generate notifications 74 00:06:12,760 --> 00:06:15,400 when the batteries need to be charged or changed. 75 00:06:16,330 --> 00:06:20,980 The voltage sensing circuits consist of simple voltage dividers. 76 00:06:21,610 --> 00:06:27,910 In this course, I'll show you exactly how to define the resistor values and how to implement the necessary 77 00:06:27,910 --> 00:06:33,190 voltage calculations in the E.S.P 32 to sketch and the code red flow. 78 00:06:34,540 --> 00:06:40,450 If you don't like working with a breadboard, you can implement the hardware on a printed circuit board 79 00:06:41,200 --> 00:06:46,540 at designed a PC B that can accommodate the components you see on the breadboard, along with a 38 PIN 80 00:06:46,540 --> 00:06:48,070 Espiritu deaf kid. 81 00:06:49,020 --> 00:06:55,110 In this course, I'll be working on the breadboard, but in the very end, I'll show you what the implementation 82 00:06:55,110 --> 00:06:55,860 looks like. 83 00:06:56,340 --> 00:06:59,350 Finally, there are a few secondary components I want to mention here. 84 00:07:00,390 --> 00:07:05,340 You need a break, but of course, like the one in the photo, or you can use a couple of many Bridgeport's. 85 00:07:05,820 --> 00:07:13,200 You also need lots of jumper wires and a power indicator so that, you know, when the circuit is powered 86 00:07:13,200 --> 00:07:21,420 on for power, I use the benchtop power supply for the motor and use the power for the E.S.P to hit 87 00:07:22,050 --> 00:07:22,440 the bench. 88 00:07:22,440 --> 00:07:29,400 Power supply was convenient because it also allowed me to test my motor voltage circuit and a different 89 00:07:29,400 --> 00:07:30,630 input voltages. 90 00:07:31,710 --> 00:07:39,090 And finally, a multimeter is always necessary to use in a project like this, I use mine to calibrate 91 00:07:39,090 --> 00:07:45,930 my voltage sensing sub circuits and to take precision readings of their resistor values so that I can 92 00:07:45,930 --> 00:07:49,800 use them in the voltage calculations in the E.S.P theory to sketch. 93 00:07:50,130 --> 00:07:52,410 All this, of course, is explained in the course.