![\"ESP8266](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/ESP8266-NodeMCU-MQTT-Publish-BME680-Temperature-Humidity-Pressure-Gas-Readings-Arduino-IDE.jpg?resize=1200%2C675&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nRecommended reading:<\/strong> What is MQTT and How It Works<\/a><\/p>\n\n\n\n The following diagram shows a high-level overview of the project we’ll build.<\/p>\n\n\n\n Before proceeding with this tutorial, make sure you check the following prerequisites.<\/p>\n\n\n\n We’ll program the ESP8266 using Arduino IDE, so make sure you have the ESP8266 add-on installed.<\/p>\n\n\n\n To use MQTT, you need a broker. We\u2019ll be using Mosquitto broker<\/a> installed on a Raspberry Pi. Read How to Install Mosquitto Broker on Raspberry Pi<\/a>.<\/p>\n\n\n\n You can use any other MQTT broker, including a cloud MQTT broker. We’ll show you how to do that in the code later on.<\/p>\n\n\n\n If you\u2019re not familiar with MQTT make sure you read our introductory tutorial: What is MQTT and How It Works<\/a>.<\/p>\n\n\n\n To use MQTT with the ESP8266 we’ll use the Async MQTT Client Library<\/a>.<\/p>\n\n\n\n Installing the Async MQTT Client Library<\/strong><\/p>\n\n\n\n Alternatively, you can go to Sketch <\/strong>> Include Library<\/strong> > Add . ZIP<\/strong> library and select the library you’ve just downloaded.<\/p>\n\n\n\n Installing the Async TCP Library<\/strong><\/p>\n\n\n\n To use MQTT with the ESP, you also need the ESPAsyncTCP library<\/a>.<\/p>\n\n\n\n Alternatively, you can go to Sketch <\/strong>> Include Library<\/strong> > Add . ZIP<\/strong> library and select the library you’ve just downloaded. <\/p>\n\n\n\n To get readings from the BME680 sensor module, we’ll use the Adafruit_BME680 library<\/a>. You also need to install the Adafruit_Sensor library<\/a>. Follow the next steps to install the libraries in your Arduino IDE:<\/p>\n\n\n\n 1. Open your Arduino IDE and go to Sketch <\/strong>> Include Library<\/strong> > Manage Libraries<\/strong>. The Library Manager should open.<\/p>\n\n\n\n 2. Search for \u201cadafruit bme680<\/strong> \u201d on the Search box and install the library.<\/p>\n\n\n\n To use the BME680 library, you also need to install the Adafruit Unified Sensor. Follow the next steps to install the library in your Arduino IDE:<\/p>\n\n\n\n 3. Search for “Adafruit Unified Sensor<\/strong>“in the search box. Scroll all the way down to find the library and install it.<\/p>\n\n\n\n After installing the libraries, restart your Arduino IDE.<\/p>\n\n\n\n To learn more about the BME680 sensor, read our guide: ESP8266 with BME680 Sensor using Arduino IDE (Pressure, Temperature, Humidity)<\/a>.<\/p>\n\n\n\n For this tutorial you need the following parts:<\/p>\n\n\n\n You can use the preceding links or go directly to MakerAdvisor.com\/tools<\/a> to find all the parts for your projects at the best price!<\/p> Wire the BME680 to the ESP8266 as shown in the following schematic diagram with the SDA pin connected to GPIO 4<\/span> and the SCL pin connected to GPIO 5<\/span>.<\/p>\n\n\n\n Copy the following code to your Arduino IDE. To make it work for you, you need to insert your network credentials as well as the MQTT broker details.<\/p>\n\n\n View raw code<\/a><\/p>\n\n\n\n The following section imports all the required libraries.<\/p>\n\n\n\n Include your network credentials on the following lines.<\/p>\n\n\n\n Insert the Raspberry Pi IP address, so that the ESP8266 connects to your broker.<\/p>\n\n\n\n If you’re using a cloud MQTT broker, insert the broker domain name, for example:<\/p>\n\n\n\n Define the MQTT port.<\/p>\n\n\n\n The temperature, humidity and pressure will be published on the following topics:<\/p>\n\n\n\n Initialize a Adafruit_BME680<\/span> object called bme<\/span>.<\/p>\n\n\n\n The temperature<\/span>, humidity<\/span>, pressure<\/span>, and gasResistance<\/span> variables will hold all sensor readings from the BME680 sensor.<\/p>\n\n\n\n Create an AsyncMqttClient<\/span> object called mqttClient<\/span> to handle the MQTT client and timers to reconnect to your MQTT broker and router when it disconnects.<\/p>\n\n\n\n Then, create some auxiliary timer variables to publish the readings every 10 seconds. You can change the delay time on the interval<\/span> variable.<\/p>\n\n\n\n We haven\u2019t added any comments to the functions defined in the next code section. Those functions come with the Async Mqtt Client library. The function\u2019s names are pretty self-explanatory.<\/p>\n\n\n\n For example, the connectToWifi()<\/span> connects your ESP8266 to your router:<\/p>\n\n\n\n The connectToMqtt()<\/span> connects your ESP8266 to your MQTT broker:<\/p>\n\n\n\n The onWifiConnect()<\/span> and onWifiDisconnect()<\/span> functions are responsible for handling the Wi-Fi events. For example, after a successful connection with the router and MQTT broker, it prints the ESP8266 IP address. On the other hand, if the connection is lost, it starts a timer and tries to reconnect.<\/p>\n\n\n\n The onMqttConnect()<\/span> function runs after starting a session with the broker.<\/p>\n\n\n\n If the ESP8266 loses connection with the MQTT broker, it calls the onMqttDisconnect<\/span> function that prints that message in the serial monitor.<\/p>\n\n\n\n When you publish a message to an MQTT topic, the onMqttPublish()<\/span> function is called. It prints the packet id in the Serial Monitor.<\/p>\n\n\n\n Basically, all these functions that we\u2019ve just mentioned are callback functions. So, they are executed asynchronously.<\/p>\n\n\n\n Now, let\u2019s proceed to the setup()<\/span>. Initialize the BME680 sensor.<\/p>\n\n\n\n The next two lines assign callbacks that will handle what happens when the ESP connects or disconnects to your Wi-Fi connection.<\/p>\n\n\n\n Finally, assign all the callbacks functions. This means that these functions will be executed automatically when needed. For example, when the ESP8266 connects to the broker, it automatically calls the onMqttConnect()<\/span> function, and so on.<\/p>\n\n\n\n If your broker requires authentication, uncomment the following line and insert your credentials (username and password).<\/p>\n\n\n\n Connect to Wi-Fi.<\/p>\n\n\n\n Finally, set up the following parameters (oversampling, filter and gas heater) for the sensor.<\/p>\n\n\n\n In the loop()<\/span>, you create a timer that allows you to get new readings from the BME680 sensor and publishing them on the corresponding topic every 10 seconds.<\/p>\n\n\n\n Learn more about getting readings from the BME680 sensor: ESP8266 with BME680 Temperature, Humidity and Pressure Sensor Guide<\/a>.<\/p>\n\n\n\n To publish the readings on the corresponding MQTT topics, use the next lines:<\/p>\n\n\n\n Basically, use the publish()<\/span> method on the mqttClient<\/span> object to publish data on a topic. The publish()<\/span> method accepts the following arguments, in order:<\/p>\n\n\n\n The QoS (quality of service) is a way to guarantee that the message is delivered. It can be one of the following levels:<\/p>\n\n\n\n With your Raspberry Pi powered on and running the Mosquitto MQTT broker, upload the code to your ESP8266.<\/p>\n\n\n\n Open the Serial Monitor at a baud rate of 115200 and you’ll see that the ESP8266 starts publishing messages on the topics we’ve defined previously.<\/p>\n\n\n\n The ESP8266 is publishing sensor readings every 10 seconds on four MQTT topics. Now, you can use any dashboard that supports MQTT or any other device that supports MQTT to subscribe to those topics and receive the readings.<\/p>\n\n\n\n As an example, we’ll create a simple flow using Node-RED to subscribe to those topics and display the readings on gauges.<\/p>\n\n\n\n If you don’t have Node-RED installed, follow the next tutorials:<\/p>\n\n\n\n Having Node-RED running on your Raspberry Pi, go to your Raspberry Pi IP address followed by :1880.<\/p>\n\n\n\n The Node-RED interface should open. Drag four MQTT in nodes, two gauge nodes, and two text field nodes to the flow.<\/p>\n\n\n\n Click the MQTT node and edit its properties.<\/p>\n\n\n\n The Server field refers to the MQTT broker. In our case, the MQTT broker is the Raspberry Pi, so it is set to localhost:1883. If you’re using a Cloud MQTT broker, you should change that field. <\/p>\n\n\n\n Insert the topic you want to be subscribed to and the QoS. This previous MQTT node is subscribed to the esp\/bme680\/temperature<\/strong> topic. <\/p>\n\n\n\n Click on the other MQTT in nodes and edit its properties with the same server, but for the other topics: esp\/bme680\/humidity<\/strong>, esp\/bme680\/pressure<\/strong>, and esp\/bme680\/gas<\/strong>. <\/p>\n\n\n\n Click on the gauge nodes and edit its properties for each reading. The following node is set for the temperature readings. Edit the other chart nodes for the humidity readings.<\/p>\n\n\n\n Wire your nodes as shown below:<\/p>\n\n\n\n Finally, deploy your flow (press the button on the upper right corner).<\/p>\n\n\n\n Alternatively, you can go to Menu <\/strong>> Import <\/strong>and copy the following to your Clipboard<\/strong> to create your Node-RED flow.<\/p>\n\n\nProject Overview<\/h2>\n\n\n\n
![\"ESP8266](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/ESP8266-NodeMCU-Overview-MQTT-Publish-BME680-Temperature-Humidity-Pressure-Gas-Readings.png?resize=862%2C632&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nPrerequisites<\/h2>\n\n\n\n
Arduino IDE<\/h3>\n\n\n\n
MQTT Broker<\/h3>\n\n\n\n
![\"Installing](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/01\/mosquitto-broker.png?resize=200%2C197&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nMQTT Libraries<\/h3>\n\n\n\n
async-mqtt-client-master<\/strong><\/del> to async_mqtt_client<\/strong><\/li>ESPAsyncTCP-master<\/strong><\/del> to ESPAsyncTCP<\/strong><\/li>BME680 Sensor Libraries<\/h3>\n\n\n\n
![\"Install](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/07\/Install-BM6280-Adafruit-Library-Arduino-IDE.png?resize=786%2C443&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n![\"Installing](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2019\/04\/adafruit_unified_sensor_library.png?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nParts Required<\/h3>\n\n\n\n
![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/07\/ESP32-Board-BME680-Gas-sensor-circuit-wiring-diagram-schematics.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n![](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/10\/header-200.png?w=1200&quality=100&strip=all&ssl=1\")
<\/a><\/p>\n\n\n\nSchematic Diagram<\/h2>\n\n\n\n
![\"ESP8266](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/07\/ESP8266-BME680-Environmental-Sensor-Wiring-Diagram-I2C-1.png?resize=831%2C531&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nCode<\/h2>\n\n\n\n
\/*\n Rui Santos\n Complete project details at https:\/\/RandomNerdTutorials.com\/esp8266-nodemcu-mqtt-publish-bme680-arduino\/\n \n Permission is hereby granted, free of charge, to any person obtaining a copy\n of this software and associated documentation files.\n \n The above copyright notice and this permission notice shall be included in all\n copies or substantial portions of the Software.\n*\/\n\n#include <ESP8266WiFi.h>\n#include <Ticker.h>\n#include <AsyncMqttClient.h>\n#include <Wire.h>\n#include <SPI.h>\n#include <Adafruit_Sensor.h>\n#include "Adafruit_BME680.h"\n\n#define WIFI_SSID "REPLACE_WITH_YOUR_SSID"\n#define WIFI_PASSWORD "REPLACE_WITH_YOUR_PASSWORD"\n\n\/\/ Raspberry Pi Mosquitto MQTT Broker\n#define MQTT_HOST IPAddress(192, 168, 1, XXX)\n\/\/ For a cloud MQTT broker, type the domain name\n\/\/#define MQTT_HOST "example.com"\n#define MQTT_PORT 1883\n\n\/\/ Temperature MQTT Topics\n#define MQTT_PUB_TEMP "esp\/bme680\/temperature"\n#define MQTT_PUB_HUM "esp\/bme680\/humidity"\n#define MQTT_PUB_PRES "esp\/bme680\/pressure"\n#define MQTT_PUB_GAS "esp\/bme680\/gas"\n\n\/*#define BME_SCK 14\n#define BME_MISO 12\n#define BME_MOSI 13\n#define BME_CS 15*\/\n\nAdafruit_BME680 bme; \/\/ I2C\n\/\/Adafruit_BME680 bme(BME_CS); \/\/ hardware SPI\n\/\/Adafruit_BME680 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK);\n\n\/\/ Variables to hold sensor readings\nfloat temperature;\nfloat humidity;\nfloat pressure;\nfloat gasResistance;\n\nAsyncMqttClient mqttClient;\nTicker mqttReconnectTimer;\n\nWiFiEventHandler wifiConnectHandler;\nWiFiEventHandler wifiDisconnectHandler;\nTicker wifiReconnectTimer;\n\nunsigned long previousMillis = 0; \/\/ Stores last time temperature was published\nconst long interval = 10000; \/\/ Interval at which to publish sensor readings\n\nvoid getBME680Readings(){\n \/\/ Tell BME680 to begin measurement.\n unsigned long endTime = bme.beginReading();\n if (endTime == 0) {\n Serial.println(F("Failed to begin reading :("));\n return;\n }\n if (!bme.endReading()) {\n Serial.println(F("Failed to complete reading :("));\n return;\n }\n temperature = bme.temperature;\n pressure = bme.pressure \/ 100.0;\n humidity = bme.humidity;\n gasResistance = bme.gas_resistance \/ 1000.0;\n}\n\nvoid connectToWifi() {\n Serial.println("Connecting to Wi-Fi...");\n WiFi.begin(WIFI_SSID, WIFI_PASSWORD);\n}\n\nvoid onWifiConnect(const WiFiEventStationModeGotIP& event) {\n Serial.println("Connected to Wi-Fi.");\n connectToMqtt();\n}\n\nvoid onWifiDisconnect(const WiFiEventStationModeDisconnected& event) {\n Serial.println("Disconnected from Wi-Fi.");\n mqttReconnectTimer.detach(); \/\/ ensure we don't reconnect to MQTT while reconnecting to Wi-Fi\n wifiReconnectTimer.once(2, connectToWifi);\n}\n\nvoid connectToMqtt() {\n Serial.println("Connecting to MQTT...");\n mqttClient.connect();\n}\n\nvoid onMqttConnect(bool sessionPresent) {\n Serial.println("Connected to MQTT.");\n Serial.print("Session present: ");\n Serial.println(sessionPresent);\n}\n\nvoid onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {\n Serial.println("Disconnected from MQTT.");\n\n if (WiFi.isConnected()) {\n mqttReconnectTimer.once(2, connectToMqtt);\n }\n}\n\n\/*void onMqttSubscribe(uint16_t packetId, uint8_t qos) {\n Serial.println("Subscribe acknowledged.");\n Serial.print(" packetId: ");\n Serial.println(packetId);\n Serial.print(" qos: ");\n Serial.println(qos);\n}\n\nvoid onMqttUnsubscribe(uint16_t packetId) {\n Serial.println("Unsubscribe acknowledged.");\n Serial.print(" packetId: ");\n Serial.println(packetId);\n}*\/\n\nvoid onMqttPublish(uint16_t packetId) {\n Serial.print("Publish acknowledged.");\n Serial.print(" packetId: ");\n Serial.println(packetId);\n}\n\nvoid setup() {\n Serial.begin(115200);\n Serial.println();\n\n if (!bme.begin()) {\n Serial.println(F("Could not find a valid BME680 sensor, check wiring!"));\n while (1);\n }\n \n wifiConnectHandler = WiFi.onStationModeGotIP(onWifiConnect);\n wifiDisconnectHandler = WiFi.onStationModeDisconnected(onWifiDisconnect);\n \n mqttClient.onConnect(onMqttConnect);\n mqttClient.onDisconnect(onMqttDisconnect);\n \/\/mqttClient.onSubscribe(onMqttSubscribe);\n \/\/mqttClient.onUnsubscribe(onMqttUnsubscribe);\n mqttClient.onPublish(onMqttPublish);\n mqttClient.setServer(MQTT_HOST, MQTT_PORT);\n \/\/ If your broker requires authentication (username and password), set them below\n \/\/mqttClient.setCredentials("REPlACE_WITH_YOUR_USER", "REPLACE_WITH_YOUR_PASSWORD");\n connectToWifi();\n \n \/\/ Set up oversampling and filter initialization\n bme.setTemperatureOversampling(BME680_OS_8X);\n bme.setHumidityOversampling(BME680_OS_2X);\n bme.setPressureOversampling(BME680_OS_4X);\n bme.setIIRFilterSize(BME680_FILTER_SIZE_3);\n bme.setGasHeater(320, 150); \/\/ 320*C for 150 ms\n}\n\nvoid loop() {\n unsigned long currentMillis = millis();\n \/\/ Every X number of seconds (interval = 10 seconds) \n \/\/ it publishes a new MQTT message\n if (currentMillis - previousMillis >= interval) {\n \/\/ Save the last time a new reading was published\n previousMillis = currentMillis;\n \n getBME680Readings();\n Serial.println();\n Serial.printf("Temperature = %.2f \u00baC \\n", temperature);\n Serial.printf("Humidity = %.2f % \\n", humidity);\n Serial.printf("Pressure = %.2f hPa \\n", pressure);\n Serial.printf("Gas Resistance = %.2f KOhm \\n", gasResistance);\n \n \/\/ Publish an MQTT message on topic esp\/bme680\/temperature\n uint16_t packetIdPub1 = mqttClient.publish(MQTT_PUB_TEMP, 1, true, String(temperature).c_str());\n Serial.printf("Publishing on topic %s at QoS 1, packetId: %i", MQTT_PUB_TEMP, packetIdPub1);\n Serial.printf("Message: %.2f \\n", temperature);\n\n \/\/ Publish an MQTT message on topic esp\/bme680\/humidity\n uint16_t packetIdPub2 = mqttClient.publish(MQTT_PUB_HUM, 1, true, String(humidity).c_str());\n Serial.printf("Publishing on topic %s at QoS 1, packetId %i: ", MQTT_PUB_HUM, packetIdPub2);\n Serial.printf("Message: %.2f \\n", humidity);\n\n \/\/ Publish an MQTT message on topic esp\/bme680\/pressure\n uint16_t packetIdPub3 = mqttClient.publish(MQTT_PUB_PRES, 1, true, String(pressure).c_str());\n Serial.printf("Publishing on topic %s at QoS 1, packetId %i: ", MQTT_PUB_PRES, packetIdPub3);\n Serial.printf("Message: %.2f \\n", pressure);\n\n \/\/ Publish an MQTT message on topic esp\/bme680\/gas\n uint16_t packetIdPub4 = mqttClient.publish(MQTT_PUB_GAS, 1, true, String(gasResistance).c_str());\n Serial.printf("Publishing on topic %s at QoS 1, packetId %i: ", MQTT_PUB_GAS, packetIdPub4);\n Serial.printf("Message: %.2f \\n", gasResistance);\n }\n}\n<\/code><\/pre>\n\tHow the Code Works<\/h3>\n\n\n\n
#include <ESP8266WiFi.h>\n#include <Ticker.h>\n#include <AsyncMqttClient.h>\n#include <Wire.h>\n#include <SPI.h>\n#include <Adafruit_Sensor.h>\n#include \"Adafruit_BME680.h\"<\/code><\/pre>\n\n\n\n#define WIFI_SSID \"REPLACE_WITH_YOUR_SSID\"\n#define WIFI_PASSWORD \"REPLACE_WITH_YOUR_PASSWORD\"<\/code><\/pre>\n\n\n\n#define MQTT_HOST IPAddress(192, 168, 1, 106)<\/code><\/pre>\n\n\n\n#define MQTT_HOST \"example.com\"<\/code><\/pre>\n\n\n\n#define MQTT_PORT 1883<\/code><\/pre>\n\n\n\n#define MQTT_PUB_TEMP \"esp\/bme680\/temperature\"\n#define MQTT_PUB_HUM \"esp\/bme680\/humidity\"\n#define MQTT_PUB_PRES \"esp\/bme680\/pressure\"\n#define MQTT_PUB_GAS \"esp\/bme680\/gas\"<\/code><\/pre>\n\n\n\nAdafruit_BME680 bme;<\/code><\/pre>\n\n\n\nfloat temperature;\nfloat humidity;\nfloat pressure;\nfloat gasResistance;<\/code><\/pre>\n\n\n\nAsyncMqttClient mqttClient;\nTicker mqttReconnectTimer;\n\nWiFiEventHandler wifiConnectHandler;\nWiFiEventHandler wifiDisconnectHandler;\nTicker wifiReconnectTimer;<\/code><\/pre>\n\n\n\nunsigned long previousMillis = 0;\nconst long interval = 10000;<\/code><\/pre>\n\n\n\nMQTT functions: connect to Wi-Fi, connect to MQTT, and Wi-Fi events<\/h3>\n\n\n\n
void connectToWifi() {\n Serial.println(\"Connecting to Wi-Fi...\");\n WiFi.begin(WIFI_SSID, WIFI_PASSWORD);\n}<\/code><\/pre>\n\n\n\nvoid connectToMqtt() {\n Serial.println(\"Connecting to MQTT\u2026\");\n mqttClient.connect();\n}<\/code><\/pre>\n\n\n\nvoid onWifiConnect(const WiFiEventStationModeGotIP& event) {\n Serial.println(\"Connected to Wi-Fi.\");\n connectToMqtt();\n}\n\nvoid onWifiDisconnect(const WiFiEventStationModeDisconnected& event) {\n Serial.println(\"Disconnected from Wi-Fi.\");\n mqttReconnectTimer.detach();\n wifiReconnectTimer.once(2, connectToWifi);\n}<\/code><\/pre>\n\n\n\nvoid onMqttConnect(bool sessionPresent) {\n Serial.println(\"Connected to MQTT.\");\n Serial.print(\"Session present: \");\n Serial.println(sessionPresent);\n}<\/code><\/pre>\n\n\n\nMQTT functions: disconnect and publish<\/h3>\n\n\n\n
void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {\n Serial.println(\"Disconnected from MQTT.\");\n\n if (WiFi.isConnected()) {\n mqttReconnectTimer.once(2, connectToMqtt);\n }\n}<\/code><\/pre>\n\n\n\nvoid onMqttPublish(uint16_t packetId) {\n Serial.println(\"Publish acknowledged.\");\n Serial.print(\" packetId: \");\n Serial.println(packetId);\n}<\/code><\/pre>\n\n\n\nsetup()<\/h3>\n\n\n\n
if (!bme.begin()) {\n Serial.println(F(\"Could not find a valid BME680 sensor, check wiring!\"));\n while (1);\n}<\/code><\/pre>\n\n\n\nwifiConnectHandler = WiFi.onStationModeGotIP(onWifiConnect);\nwifiDisconnectHandler = WiFi.onStationModeDisconnected(onWifiDisconnect);\n<\/code><\/pre>\n\n\n\nmqttClient.onConnect(onMqttConnect);\nmqttClient.onDisconnect(onMqttDisconnect);\n\/\/mqttClient.onSubscribe(onMqttSubscribe);\n\/\/mqttClient.onUnsubscribe(onMqttUnsubscribe);\nmqttClient.onPublish(onMqttPublish);\nmqttClient.setServer(MQTT_HOST, MQTT_PORT);<\/code><\/pre>\n\n\n\nBroker Authentication<\/h4>\n\n\n\n
mqttClient.setCredentials(\"REPlACE_WITH_YOUR_USER\", \"REPLACE_WITH_YOUR_PASSWORD\");<\/code><\/pre>\n\n\n\nconnectToWifi();<\/code><\/pre>\n\n\n\nbme.setTemperatureOversampling(BME680_OS_8X);\nbme.setHumidityOversampling(BME680_OS_2X);\nbme.setPressureOversampling(BME680_OS_4X);\nbme.setIIRFilterSize(BME680_FILTER_SIZE_3);\nbme.setGasHeater(320, 150);<\/code><\/pre>\n\n\n\nloop()<\/h2>\n\n\n\n
unsigned long currentMillis = millis();\n\/\/ Every X number of seconds (interval = 10 seconds) \n\/\/ it publishes a new MQTT message\nif (currentMillis - previousMillis >= interval) {\n \/\/ Save the last time a new reading was published\n previousMillis = currentMillis;\n \n getBME680Readings();\n Serial.println();\n Serial.printf(\"Temperature = %.2f \u00baC \\n\", temperature);\n Serial.printf(\"Humidity = %.2f % \\n\", humidity);\n Serial.printf(\"Pressure = %.2f hPa \\n\", pressure);\n Serial.printf(\"Gas Resistance = %.2f KOhm \\n\", gasResistance);<\/code><\/pre>\n\n\n\nPublishing to topics<\/h3>\n\n\n\n
uint16_t packetIdPub1 = mqttClient.publish(MQTT_PUB_TEMP, 1, true, String(temperature).c_str());\nuint16_t packetIdPub2 = mqttClient.publish(MQTT_PUB_HUM, 1, true, String(humidity).c_str());\nuint16_t packetIdPub3 = mqttClient.publish(MQTT_PUB_PRES, 1, true, String(pressure).c_str());\nuint16_t packetIdPub4 = mqttClient.publish(MQTT_PUB_GAS, 1, true, String(gasResistance).c_str());<\/code><\/pre>\n\n\n\nUploading the code<\/h2>\n\n\n\n
![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/ESP32-ESP8266-Arduino-IDE-Serial-Monitor-BME680-Temperature-Humidity-Pressure-Gas-Air-Quality.png?resize=1115%2C592&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nPreparing Node-RED Dashboard<\/h2>\n\n\n\n
http://raspberry-pi-ip-address:1880<\/code><\/pre>\n\n\n\n![\"Drag](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/drag-nodes-esp32-esp8266-node-red-bme680.png?resize=246%2C223&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n![\"Edit](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/edit-mqtt-in-node-esp32-esp8266-node-red-bme680.png?resize=498%2C365&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n![\"Edit](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/edit-gauge-node-esp32-esp8266-node-red-bme680.png?resize=499%2C567&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n![\"Node](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/node-connected-esp32-esp8266-node-red-bme680.png?resize=408%2C233&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n![\"Deploy](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/11_deploy_button.png?resize=138%2C40&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n[{"id":"3b7f947c.9759ec","type":"mqtt in","z":"254c9c97.f85b34","name":"","topic":"esp\/bme680\/temperature","qos":"1","datatype":"auto","broker":"8db3fac0.99dd48","x":470,"y":2640,"wires":[["b87b21c3.96672"]]},{"id":"b87b21c3.96672","type":"ui_gauge","z":"254c9c97.f85b34","name":"","group":"37de8fe8.46846","order":2,"width":0,"height":0,"gtype":"gage","title":"Temperature","label":"\u00baC","format":"{{value}}","min":0,"max":"40","colors":["#00b500","#f7df09","#ca3838"],"seg1":"","seg2":"","x":690,"y":2640,"wires":[]},{"id":"f92248f4.545778","type":"mqtt in","z":"254c9c97.f85b34","name":"","topic":"esp\/bme680\/humidity","qos":"1","datatype":"auto","broker":"8db3fac0.99dd48","x":460,"y":2700,"wires":[["4114a401.5ac69c"]]},{"id":"4114a401.5ac69c","type":"ui_gauge","z":"254c9c97.f85b34","name":"","group":"37de8fe8.46846","order":2,"width":0,"height":0,"gtype":"gage","title":"Humidity","label":"%","format":"{{value}}","min":"30","max":"100","colors":["#53a4e6","#1d78a9","#4e38c9"],"seg1":"","seg2":"","x":680,"y":2700,"wires":[]},{"id":"ad51f895.2c2848","type":"mqtt in","z":"254c9c97.f85b34","name":"","topic":"esp\/bme680\/pressure","qos":"1","datatype":"auto","broker":"8db3fac0.99dd48","x":460,"y":2760,"wires":[["3a95123b.66405e"]]},{"id":"c074e688.198b78","type":"mqtt in","z":"254c9c97.f85b34","name":"","topic":"esp\/bme680\/gas","qos":"1","datatype":"auto","broker":"8db3fac0.99dd48","x":440,"y":2820,"wires":[["d3539c06.00a17"]]},{"id":"3a95123b.66405e","type":"ui_text","z":"254c9c97.f85b34","group":"37de8fe8.46846","order":2,"width":0,"height":0,"name":"","label":"Pressure","format":"{{msg.payload}} hPa","layout":"row-spread","x":680,"y":2760,"wires":[]},{"id":"d3539c06.00a17","type":"ui_text","z":"254c9c97.f85b34","group":"37de8fe8.46846","order":3,"width":0,"height":0,"name":"","label":"Gas","format":"{{msg.payload}} KOhm","layout":"row-spread","x":670,"y":2820,"wires":[]},{"id":"8db3fac0.99dd48","type":"mqtt-broker","z":"","name":"","broker":"localhost","port":"1883","clientid":"","usetls":false,"compatmode":false,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"37de8fe8.46846","type":"ui_group","z":"","name":"BME680","tab":"53b8c8f9.cfbe48","order":1,"disp":true,"width":"6","collapse":false},{"id":"53b8c8f9.cfbe48","type":"ui_tab","z":"","name":"Home","icon":"dashboard","order":5,"disabled":false,"hidden":false}]\n<\/code><\/pre>\n\t