IoT NODE | ESPNOW Based Project

DHT11 Temperature & Humidity Sensor (4 pins)

0.96" OLED 64x128 Display Module

ESP8266 ESP-01

Arduino IDE

Arduino UNO

Soldering iron (generic)

<p ><span >In this project information from multiple ESP8266 boards via the ESP-NOW communication protocol with a one-to-Many scenario. several ESP boards send the data we want to one board. There is no such thing as a transmitter or receiver in ESP-NOW documents. Each ESP8266 board can be a transmitter or a receiver. However, we will use these terms to describe the status of each board in the project. Visit </span><a href="https://cifertech.net/">CiferTech </a><span >for more tutorials, and be sure to follow my </span><a href="https://www.instagram.com/cifertech/">Instagram </a><span >page to support me.</span></p><p ></p><p ></p><div class="se-component se-video-container __se__float-none" contenteditable="false" style="width: 100%;"><figure style="width: 100%; height: 56.25%; padding-bottom: 56.25%; margin: 0px;"><iframe frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/fXhsV-RXuXQ" data-proportion="true" data-percentage="100%,56.25%" data-size="100%,56.25%" data-align="none" style="width: 100%; height: 100%;" data-index="0" data-file-size="0" data-origin="100%,56.25%"></iframe></figure></div><p ></p><h3 ><span >ESP-Now protocol</span></h3><p ><strong >ESP-NOW</strong><span >  is a wireless communication protocol developed by  </span><strong >Espressif</strong><span > and capable of packet transmission. This protocol enables multiple devices to easily communicate with each other and transfer information optimally between each other. </span><strong >This protocol is similar to the 2.4 GHz</strong><span > wireless connection, often used in wireless mice. Therefore, it is necessary to pair the devices before communicating. This means that the connection is stable after the devices are paired with each other. In other words, if one of your ESPs suddenly shuts down or resets, the connection is established automatically when you restart.</span></p><h3 ><span >Project Description</span></h3><p >In this project, we used two ESP8266 boards, version 01, which are assembled in a personalized PCB, in one of the boards, or in other words, our nodes, an OLED display is installed to display the received items, and in the other board. A DHT11 sensor is installed to measure temperature and humidity. This way we will be able to collect more data by increasing the nodes.</p><p > </p><h3 ><span >PCB</span></h3><p >In order to establish connections in this project, we use a PCB designed with the help of Altium Designer. This circuit includes the connections required for OLE modules and DHT11 sensor, as well as the power input and serial output to program the board. There is also a relay in this circuit that will not work due to a bug in this version of the PCB.</p><figure><img src=https://projects.arduinocontent.cc/252d4c83-efc3-4602-b327-f1327af116c5.jpg /><figcaption> </figcaption></figure><p ></p><figure><img src=https://projects.arduinocontent.cc/7de7475f-70a0-4fde-8e7b-21105d20a6c4.jpg /><figcaption> </figcaption></figure><p ></p>