IoT Temperature and Humidity Sensor Real-Time Monitoring System
Using MQTT transport protocol as the foundation, implementing a basic IoT remote real-time monitoring system through Raspberry Pi, NodeMCU and other devices.
Abstract
The main purpose of this project is to use simple and inexpensive equipment like Raspberry Pi to implement remote real-time monitoring functions. Using Raspberry Pi as the main communication hub (Broker), NodeMCU as the IoT system’s Client for first-line device operations, and MQTT transport protocol to handle [publish]/[subscribe] values between host and client, enabling the entire IoT system to operate smoothly.
System Architecture
| Main Components | Function Description |
|---|---|
| Raspberry Pi 3 | The core of IoT, a powerful open-source single-board computer. Using Python supported by the system to establish MQTT connection protocol, completing [publish]/[subscribe] functions to Client side. |
| NodeMCU | An open-source IoT single-chip containing ESP8266 IoT WiFi chip. Small size yet powerful, using Arduino to develop programs establishing MQTT connection protocol, implementing [publish]/[subscribe] functions to Server side. |
| ESP8266 | A low-cost but feature-rich WiFi chip, also a core IoT component. Using ESP8266’s AT commands to implement embedded system network connection transmission tools. |
| MQTT Protocol | A [publish]/[subscribe] type messaging protocol designed for low hardware performance and poor network conditions. Designed for IoT transmission, its [publish] and [subscribe] functions are the core of this project. |
System Flowchart
Final Results
