This tutorial will create an internet of things sensor node based on an ESP32 development board. This node will use the MQTT protocol to send sensor data over WiFi to a Raspberry Pi based IoT server. This tutorial will allow you to collect any kind of sensor data you like, send it over your network to a MQTT server and visualise it on a Grafana dashboard.
This system consists of a series of sensor nodes that send sensor data in a JSON message over the network to a Raspberry Pi via MQTT. MQTT is a network protocol where a client pushes data to a broker, such as mosquitto, and the broker pushes that data to any client that has subscribed to that topic. A topic categorises the data that is sent. Any client that is subscribed to "home/sensor" will be forwarded this MQTT message containing the sensor data. On the Raspberry Pi server, NodeRED will subscribe to this topic, interpret the json message data and then send the data to a database to be stored and used. InfluxDB will store all the sensor data. Then a Graphana front end will query the database in order to display the data we want to see and do a whole host of other things. This is all explained in our Raspberry Pi IoT server tutorial linked below.
Helpful links:
Source code: [ Ссылка ]
Raspberry Pi IoT Server Tutorial: [ Ссылка ]
ESP32 Dev Board: [ Ссылка ]
Timestamps
00:00 Introduction
00:41 System Overview
01:40 How does this work?
02:58 Payload format
03:16 Required libraries
03:36 Hardware setup
03:51 Arduino IDE implementation
04:28 Programming
10:00 Conclusion
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