![]() MQTT is known as Message Queuing Telemetry Transport protocol.Node-Red receives the sensor data and displays them in an interactive manner in its dashboard. We have Node-Red as a subscriber to these seven topics.Similarly, this board publishes the DS18B20 temperature readings in Celsius on the MQTT topic: esp32/ds18b20/temperatureC and publishes the DS18B20 temperature readings in Fahrenheit on the MQTT topic: esp32/ds18b20/temperatureF.Likewise, it publishes the BME280 pressure readings on the topic: esp32/bme280/pressure. It publishes the BME280 humidity readings on the topic: esp32/bme280/humidity. It also publishes the BME280 temperature readings on the topic: esp32/bme280/temperature.This ESP32 board publishes the DHT22 temperature readings on the MQTT topic: esp32/dht/temperature and publishes the DHT22 humidity readings on the MQTT topic: esp32/dht/humidity.Refer to the following article ( Install Mosquitto MQTT Broker on Raspberry Pi) to successfully install it in Raspberry Pi before moving forward. ![]() ![]() We will use Mosquitto broker on Raspberry Pi. An ESP32 board connected with DHT22, BME280, and DS18B20 sensors will connect to the MQTT broker.
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