424.ESP8266 NodeMCU MQTT - Publish Temperature, Humidity, Pressure, and Gas Readings from a BME680 Sensor (Arduino IDE) Learn how to use the ESP8266 NodeMCU and MQTT to send temperature, humidity, pressure, and gas air quality readings from a BME680 sensor to any platform that supports MQTT or any MQTT client. As an illustration, we will send the readings from the sensors to the Node-RED Dashboard MQTT is gaining popularity as an Industrial IoT (Internet of Things) data protocol. It is a lightweight method that is both efficient and secure, and it was developed for the purpose of connecting remote devices to a central server. On the other hand, IoT installations are becoming larger and more complicated, and there is a rising demand for OT/IT connectivity. The MQTT protocol is therefore good for the environment and simple to implement for a large number of devices. Keeping devices connected despite having unreliable networks: Even when connections between devices are

unstable, MQTT in the Internet of Things is able to leverage QoS levels to assure that messages will be delivered to their intended recipients.

The ESP8266 is a required component (read Best ESP8266 development boards) Raspberry Pi board equipped with BME680 and ESP8266 Guide (read Best Raspberry Pi Starter Kits) Class 10 MicroSD Card with 16 GB of Storage Supply of Electricity for the Raspberry Pi (5V 2.5A) A set of jumper wires Breadboard

A high-level overview of the project that we are going to construct can be seen in the accompanying diagram. Readings from the sensor are requested by the ESP8266, which is connected to the BME680. Node-RED is subscribed to those topics; Node-RED receives the sensor readings and then displays them on gauges and text fields;

The temperature readings are published in the esp/bme680/temperature topic; the humidity readings are published in the esp/bme680/humidity topic; the pressure readings are published in the esp/bme680/pressure topic; and the gas readings are published in the esp/bme680/gas topic. You have the ability to receive the readings in any other platform that supports MQTT, and you may treat the readings in any manner that you see fit. BME680 Integrated Environmental Sensor The BME680 is a digital sensor that measures gas, humidity, pressure, and temperature all in one package, and it does so use sensing methods that have been tried and tested. The BMP180, BMP280, and BME280 are all predecessors to the BME680, which is an updated and superior version of those models. The BME680 has a gas sensor that can detect a wide variety

of volatile organic chemicals, which allows it to monitor the quality of the air within. High linearity and accuracy are both characteristics of the sensor. The BME680 was designed specifically for mobile applications and wearables, two categories of electronics in which the criteria for size and power consumption are particularly stringent. The gas sensor contained within the BME680 is capable of detecting a wide variety of gases, including volatile organic compounds, in order to carry out air quality measurements (VOC).

Connect the BME680 to the ESP8266 in the manner depicted in the accompanying block diagram of the schematic. The SDA pin should be connected to GPIO 4, and the SCL pin should be linked to GPIO 5.