Build your IoT Device with Arduino/ESP32

1. Introduction: In this online course, you're gonna learn to create your own Internet of Things device with an ESP 32. The next few minutes, we're gonna create an Web Dashboard on un-free to use IoT program and also create the proper sketch so that you can control here an LED or from the Internet in real-time. Also can manipulate the brightness level of the LED. And we are sending real-time sensor data from our Arduino to the web dashboard and visualize it afterwards. We're also add some optimizations that went on. Thresholds will be reached. Then we get the notification on our smartphone. We're developing the Arduino code step-by-step, and all codes are available for downloads. I'm looking forward to see you in class. 2. Free IoT Brokers: Let's start with some quick over you. Blink is one of the IoT protocols, which I think is really, really handy because they have a good library. And also we can start right away. The next cool thing is they have a free account. That means we can connect two devices. Five uses maximum basic widgets, but it's enough for us. And also we have one week of historical data. Bus pricing sources is by $5 each month and have ten devices. It's awesome. Reasonable price when you want to add more devices to you. Blinker count. But there are also other IoT protocols which I can recommend. And F If you have steam one setup, there were all in the same way. For example, thing i o, It's also nice platform where you can connect with you ESPs and make some nice IoT devices. Thing i o is more in the m CPU and Tegea environment. It's not so straightforward, but also easy to use when you like MQTT. And I also can recommend these because all of these platforms has been having free account. And this is in my opinion, always a good way to make the first experience and afterwards. You can also choose if you want to go pro or not. 3. Wiring: Let us jump right into the wiring part. I have fear, an ESP 32 and temperature sensor. The 112 resistors with 300 ohms and ten kilo ohms, one LED, and a few jumper cables. In general, here I have connection to five worlds to ground the four pins of the VHD L11. The first one is connected to the VCC, him to five-year-old, for example. The second one is the data line. We are connecting the data line. For example, GPIO. Twenty-five, GPIO means general purpose input and output for our ESP 32. And also there is recommended and ten kilo-ohm resistor going from the data line to their BCC. It's pull up resistor so that we have in good sign on our data line. The certs pin is not connected and default pin of the DHT alignment goes to grants. Then on the GPIOs 32 I think is that we're going to the resistor. The resistor output in our LED him to the anode and the blood side and the cathode or the minus side that goes to ground. That's on what we have here. So the main purpose of this sketch, or if this warren part would be that we sent the data of temperature, humidity date down to our blink website. And also that we can manipulate and switching on and off the LED via the web dashboards. So let's focus on the varying part here. So I feel the components. And now the USBE certainly tool I have here, the developer port. I think in a second, can you also can use an ESPN 8266, but then be awhile you have to implement other libraries. First of all, I make the connection. Similarly a bit in. Make the connection from five volt pin to glass on the breadboard. And also with the grounds. Also I recommend to look at you are pinouts because I have fear. The second pin, knot and ground It's a cmd pin. But I saw an add-on pin outs from the ESP sorted to the second opinions grounds, my ground pennies here. So let's check your pin outs according to your ESPN so that you have the proper and right pins. This is our ADHD 11 project will also work with ADHD 22. This one has not so much accuracy, but for our project It's totally fine. Sticking. Dan. Fear some short circuits for making the connection. Then we're going to get the first pin two plus. We have also the last pin, two minus or the ground pin. The second goes the data pin. The data bim goes to Let me see, Twenty-five. Twenty-five is here. And also we have ten kilo ohm resistor. Ten kilo ohm resistor goes to Vcc and that's disconnection. Then once again, the output sir 72 or think goes to the resistor and the resistance jumps over to the next part of the breadboard. And then I have feared the LED and steady long opinion would be the plus poem. Smaller than d plus, minus. We're connecting the minus side. So the ground off debt bradyzoites, That's our finished circuits. So once again, connects plus and ground from the ESP into the breadboard. The first pin will be the blast. The second data pin is not connected off the DHT E11. The last one is two, goes to the ground. Also add ten kilohm pull-up resistor to the data pin. Pin goes to G 25 and the LED goes from GPIO. 32. Resistors reentered ohms, the LED. That's what we want now. Short little circuits for our IoT device. 4. Datastreams: We are now back at our blink website and I'm assuming that you have already registered, you set up an account and logged in. And it then you should see the same website, nearly the same website as I have here. Let's jump right into the templates. It should be on the left side. And I already have one template here, but we are going to the right top corner and creating a new template. We're typing here in the name as you would like. Here, we have two options. The hardware under connection type, I always are only use wife team so far, and it's a hardware you can choose here, your microcontroller, for example, ESPN thirty two, eighty two, sixty six or also at respiratory buyer can add a description and then you hit done. Now we have our main template. And with this template we can organize ourselves also the virtual pins and the web dashboard. And this is what we do know. We have a felt their configuration and disinformation. We get a little bit later so you can copy it, but you don't have to. We are jumping now into data streams. The data streams are the connection from the dashboard to our ESP, where now connecting virtual pins here on the dashboard and later on in the sketch so that we can hear fear and data exchange. The main purpose will be in this project that we switch on the LED and also within slider changed uprightness. Therefore, we need two data streams, virtual pin. The first one will be brightness. I select virtual pin one. We are only taking into churn this example and we say 0 to 100, sera means completely dark and 100 different brightness can also define them default value. If you want to. Under advanced, I would like to turn on switch with latest. So we're really every time device connected to the Cloud. That's really convenient. So you always get the last state of your LED. Then click on Create. We're making new data stream because we also wanted to switch on and off the LED. Therefore, we are defining LED, making an wheat, for example, integer min, max one because we only need two states. And I also want to define sync with latest. And the default value will always be theorems or it should be off. Dan, click on Create. Let's all what we need so far. Then. Don't forget to click here on safe. And now we have already insert our two data streams which will be later connected in our sketch for the data exchange. 5. Web dashboard: As a next step, we set up our web dashboard here on the menu, and we'll click on Edit. And T, We have a few widgets. Not all are available for us because it's in the basic version. We only have fewer and slider, for example, drag and drop it here into our dashboard and also and switch. The main idea is that we set up now and the communication from the web dashboards to the ESP. And later on we're also sending data from the ESP and visualize it on a dashboard. But this will be the first step. So Trek and dropped the elements here on the dashboard. And when you hover on the widget, there's a gear symbol. Then you click on the stream, we're selecting brightness were already have defined here. Everything click and save. The switch. Choose source, LED. We too safe. Don't forget to save on the whole dashboards. And that's all for making a template for the VAP dashboards. 6. Add a Device: So now it's on the time that we are making the next step. So we're clicking on search or under main page. And we want to add here and device on the right top corner, clicking a new device, Dan, we're selecting from templates. Choose template. We are sent drop-down menu, click on it, select USP to LED. Device name already inserts, and then click on Create. Here we have our secret source because this is what we need afterwards for the USB connection. Now I can show you here are the dashboard which we are already implemented in the template. And this is now where afterwards we can make some changes. But as you can see, my device is not online. That's because we haven't got implemented it. So we are created in template and device. And in the next video, we're gonna set up this sketch. 7. Libraries and compatibility : Before we start with decoding part, I would like to introduce you to the main library of blink. I give you the link also. It's attached in the sketch by itself. But what I would like to focus here is we have fear examples. Now we can choose, for example, board swiping. Here you have a lot of examples for node MCU, for ESP 8266 stand-alone, it's at. And I'm using the ESP 32 WiFi example. With this sketch by itself, you should make and connection to the blinks out, which we do later on. But just go through the main basic steps. So we have here and define a serial. We may can, we feel we have to include three libraries, Wi-Fi, wi-fi client and the blink simply ESP certainty to them which already included one you have included are in starts the whole Blink library. And then we have to define three variables. The char for SSID and password is for your local network. And TEA, we have also a char out variable for the outs token. Once again, I'm switching back to the blink sides. Don't mix it up because here it's undefined. Declare it a little slightly difference. But keep in mind, use this chart elements and then you're in a safe site. Then in the setup, just we making a book Blink begin with the author variable was the SSID variable and the pus. And that's all what we need after we make it run in the loop. And then we have from proper connection to the blink website. Nevertheless, if you're using the ESP 32, it's pretty straightforward. But as you can see, there are lots of other examples. When you have another microcontroller. 8. ESP32 first connection with Blynk: Let us now start with the coding part. And my approach is dead. I'm always saving after each video my whole sketch. And I give you always the filename at the beginning of the video. And now we will start with several, one. And I also created here on file, It's called micro-credentials dot h. When you create this file and then you open your Arduino IDE, you can see yours and second top where you can omit. And in this topic, I've included my credentials in this form. Here is my SSID or my passwords and my alt key from the website, from the blink website. This is what you also can include, but you also can include it here. In main sketch. With includes. You can add the file into the main sketch. Don't forget to select the proper board for you. Yeah, and the board manager and the Arduino IDE to him, you can install, for example, these be 32 core. What we have to do now is we're going to the library manager and you're typing in Blink version from below the mean demand skier is the right one. When your insulin the blink. Then you also can add snow building library for the ESP 32. So let us start with domain D defines, first of all, blink several prints. Then we're defining here the template ID and the name, but I have to switch back. What's the template ID? Afterwards, we have to include the Wi-Fi. Wi-fi clients should be included in the core. If you have not getting uncomplaining error, just go to library manager and install it. Now we've already included the blink simple USB 32 should be, I think it should be everything going do a desk setup apart. In the setup part, we now make the connection to deserve. This will be happened with the blink begin off SSID and pass is in the credentials. In the loop. We're typing in Blink run. Let's give it a try. If I've misspelled, maybe it's something I mistyped. Then compiling. Compiling. Looks good so far. Then, what do we have here now? Let's see it. Connected, of course, the USP and toward my PC. Then we click on the indices and monitor. It's connecting. And it's connecting to my wife team. This is my temporary IP address. And here we see the blink connection is successful. You are very good. If you have some troubles, then check once again your credentials from the blinker, authToken the template ID, and be aware of the variables for the connection. It should be in this format and then you should have and simple connection. But it's, nothing happened because we have nothing implemented, but the connection is right. 9. Get Data from Blynk: Now we want to make and data exchange run the web dashboard to our USP and with my new file, 0 to one, where only needs to add a few lines so that this could be happening. You can see obviously here in green dots, that means that the ESPs already connected to my dashboard. Now we're jumping above the white setup part and we typing in the blink right inside this blinker, right function. It means that the sketch will be monitored in the background if there is some changing our diet data incoming into now a weekend, simply assign a temporary variable, for example, a pinwheel you. And this will be always the same. We type in Param, this is the part of Meta which will be transferred from the dashboards to our sphere. Then we typing in as an integer because we want an integer and just print it out. We one where you stand and print line. And then the LED is also value from 0 to one. So we copy function here pasting in, changing to F. We could also leafed a temporary variable PIN value because it's insights the function. And then we say ReLU is, let's give it a try. Uploads the whole sketch, and then we should make some changes. Catch his compiling and uploading. No typing errors. Uploaded completes. Then we opened a ceremony Tom, connecting to homebase. We are connected. Now. We should see when we turn on the LED, we should have an one off. Very, very good. And also here when we change the slider, we should get here some values. And as you can see it with these few lines we have here and real-time communication exchange from an Baptist sports to our ESP 72. So easy. So first, in the next video, we once now really interact with our hardware parts. 10. Change LED state and brightness via Internet: Now let us interact with the LED. And therefore, I would suggest if you want to follow me along, I've created a new file, three, and now we have to define at the very first beginning on Rich Pin, we have our LED and therefore integer, for example, LED pin, and it's their pinna 3232. In the setup part, we have to define pin modes. It's called LED pin, and it's an output. Let me see if I've outputs should be an uppercases dip in O-chem. Then we could now jump into V1. And then we say, we do it because we do is to switch leaf to print earlier. For debug propose if PIN value is one, then digital rights too high. If Sarah, Digital LED pin is low, send it to the device. It's finished, upload it. Then we're going to the serial monitor connecting the device once again, switching the camera split, we can see something. Now when I'm clicking here on the LED, it's in front of debts. The ADD pattern. Then you can see at the serial monitor we centered one and also the LED. Will it go on? I think the first thing works really well. Now, what do we want to do is we want to change the brightness of our LED. And therefore, I would suggest we have to add tier and other Librarian for the ESPN. When we want to make some changes to the analog rights, then we have to include here Awesome library. That means analogWrite is an SP 8266 included. Here. We have to include it and it'll rights. Just download it on from the library manager. Now, first of all, we have also changed yet a digital rights. So for example, analogWrite were sent here and PGM signal, that means we can send not also, not only a digital, digital value means 0 or one, but now we can send from one to earn that 55, for example, different invidious bright LED pin. And when we want to have fits very proud to be sent to 255. Low will be here as 0. The same thing we could now apply here. For B1 means we are seeing analogWrite LED pin. The pin value will be here. The value will be the variable from the pin value of sum. Now changing here. That we also can see here the LED am a switch, but we are stuck to the brightness layer is so therefore, when our null passing the value of the pin value will be only can change values from 0 to 100, but the LED can have states from 0 to 255. And therefore, we also have here another function. And the function what we want to use is east and mapping function. So for example, we say Nu is map. This mapping function will have five integers. The first will be the variable which we put into the function that's the pinwheel here from above. And then we can see from low, from high. So our lower, the pinwheel is 0 to 100. We remember we can hear change serum to 100. This value should be changed from 0 to 255. This isn't a convenient way. Then we are writing the analog rights with the new way Lian, uploading the sketch. And then we should be able to see, hear and fading effect when we change the brightness slider up on our lab dashboard. So we have 255 different kinds of states which LED will be turned on and off. So how about my piling progress or progress? Not very far. There we go. Let's see. Uploaded. Making the hardware sets connected to homebase. Readier refers to a website. Then LED on LDF works perfect. Led on. If you can see here a slight change. 15%, 80 percent, Sarah will be turned off. Then I can turn it on with this slider because we're making another look right? Then when I'm switching on LED switched, I need to jump to 255 and we can turn it off with the analog write brightness slider. Very nice. As you can see, simple, simple methods with brightness and switch and implemented in a real-time Internet environment. 11. Sending sensor data to Blynk: In this video now, we want to make an exchange from their DHT 11 temperature, humidity and will be sent to our dashboard and also visualize it. Therefore, we have to add something in our templates. Templates years BY 32 LEDs. We go to data stream and we click on Edit and we add more pins. For example, temperature. Who came is there also WAS okay, min, max, advanced sink, not daunting kids. And the pin is three. Then we add a new data stream, virtual pin, which would've been for whom? 100. Some units. Let me see. Millimeter kilometer ground milligram quota seconds, Celsius. Interesting. Then. And one under default value on, looks good so far. Then we say Fitz, update the active device continuum. Switching back to our device now, before we go to dashboard, because we want to edit something, for example, drag and drop one gouge. Click on the year, some boom, we're choosing here. The temperature. Title is temperature on congested duplicated data stream for we can choose to color, I would like a blue one. And tier I would like to have an red one, orange safe safe Update device. Going to my device. Espn. We have now our dashboard. But of course we haven't implemented anything in this sketch. Therefore, we are going back to false. Okay, that's better. So let us see that we get here in our sketch some data from our bed here from our sensor. We have to implement also an library, and it's called the DHT library, just downloaded through the library manager. Then we have to define here to thinks the pin and which sensor type there is also an ADHD 22. More accuracy one. Then you have to change 20 to the pin. We have fit in the wire diagram and then we are initialize the object, the HTM with the pin and the type. And for later on, we also include here and Taemin and blink time on. This is also in the core ESPN included. And now we have to jump into our setup setup part. We start with our VHDL and begin. And we also include in the loop that's blink timer will be run because we want to send to you on a regular basis continuously our new data to our web dashboard. And this will be assigned with our timer. So therefore, we can set in the setup timer set into volume. We can put in milliseconds defining as long and send data to blink. And this will be our own created function. Each seven seconds to timer will jump into this function and call the function. We also could do it in the loop with the Middle East, but why not using here the timeout? So going a little bit up here, I would like to use some white sand theta w. Therefore, we have to read the temperature and the humidity from our center. We're making and temporary variable. It's called Team and DHT. Temperature. If you would like to have unit celsius, more other other types, then you can type in true or for fine heights, for example. But I went to have to Celsius. Then a float atrium immunity MD BHT. That's the name of our object. Read it. Now in this temporary variable, our real-time environments sensor data will be stored. Then we're making here and logic. If it's not a number, then there is something doesn't problem. But if there is a number, if condition will be skipped. And then it's really simple to send the data to our web dashboard with say for example, V3 him, blink virtual rights, we sorry, that's the temperature. And passing the variable t, then blink. Ritter rights. V4 is too many idiom. I want for debug purpose would like to have the temperature data also in the serial monitor. And it's all we have to do here. So let's see if we got any errors in their campaigning. But I think That's all what we have to do. As you can see, it's also an simple simple lines of codes. Just read out the sensor data. And with blink Ritter rights, we can pass values to our dashboard. Sketches uploading. We can see our setting. Turn on the 0 monotone connecting to homebase. Connected connection is there. Here we have our data tempted to 22 degrees. Perfect. As you can see, him will be updated every seven seconds. And with our temperature 2200 and also your humidity and with certain date, but on the serial monitor I only printed the temperature. There we go. We have our Internet of Things device which sends data to the dashboard and we can send also data from the dashboard. To our years being ECS, it is with only around about 80 lines of code. 12. Use automatization to observe your sensors: Blink offers a lot more than only sending and receiving data. There are some optimizations algorithm in the background which we can use. For example, when some values, there is a threshold from some values, then sending and they're sending an e-mail or we get a notification on the hip. And step by the way, is also good. Downloaded it. It's the blink IoT app. And we can also create and dashboard. It's not suit with the web dashboard. All what we did so far, you can also use or make on their Android and iOS. So, but here I would like to show you what we can do with optimization. First of all, we go jump into our templates to the data streams. For example, I would like to make your threshold from the brightness level when uncertain type of brightness level will be reached, then I wouldn't get and notification on my smartphone. So of course you can do it also with the temperature level, but it's easier with the slider to show you. Click on the first of all, we have to go to Edit, then to the brightness level. Go to Advanced scrolling down. And here we have the exposure optimization and voice assistant exposure to our optimization. Then we click available in conditions and we choosing here for example, brightness level. You see color changing range control or power switch. What available in actions? Click on Save. Click on save. Update one device continuum. Now, here, there is the optimization link missing. Just reload the page. And then we have here the optimizations. If we changed here, the data stream, then we click on optimization automations. Automations. And here we have conditions, schedule on time, sunset, scene device state. And this is really handy when it comes to Internet of Things devices, for example, if you want to control some liquid levels, or you want to start some motors, some relays, etc. Really, really cool device state. For example, you can also open windows or doors when some temperature level will be reached. But here we want to set the brightness level from our I-SPY surgeon to when. It's, let me see. Not equal, less than equal, for example, 20. Brightness control. Then send an app notification and the subject, it is too dark. Help limit, temporary, no limit. What's that? Can change those to cover. And that's it. Safe. As you can see, we can also change here to e-mail or whatever. But I only want you to have this brightness control here. Let's jump back to our device, to our change here. Here's my device. I have opened up there, blink up, but I close the app, then switching off. We are changing the brightness level. Nothing will happen. Nothing will happen. Now I go on the 20th. I got the notification from blink. It's too dark. Help. You see that instead? Instead of focus, I don't know. But here's the the dark. Listen once again. Above the threshold. Going on, the knees are going below. We've got the notification. And this is also very handy when it comes to, for example, watering your plants, liquid things also with time conditions. A lot of opportunities which the blink dashboard and optimization algorithm. So far we are coming to the end of our whole project. 13. Conclusio: We are now at the end of this online course, and I would like to summarize all the learnings which we made here in this course. First of all, we created an Internet of Things device. We are sending data from our web dashboard to our USP. For example, we can switch on the LED and also change the brightness levels. Then afterwards, we're also sending real-life sensor data to our dashboards and wishlist it also in real-time on the blink website. Afterwards we edit also some optimization algorithm. For example, when the threshold is reached, then also we get notification on our smartphone. And this is really smart home or also an Internet of devices thing was few lines of code, easy-to-use, free to use. This short and quick online course. I hope I see you in another class.