ESP8266 Museum-TempHumi Monitoring System

Version: 1.2.4 | Developed with: Mixly 2.0 RC4

Overview

This project implements an IoT environmental monitoring system using the ESP8266 microcontroller. It integrates:

DHT11 Sensor: Monitors temperature and humidity
OLED Display: Shows real-time sensor data
MQTT Communication: Enables remote control and data publishing
Alarm System: Triggers alerts based on threshold values

Using Mixly

Download .mix File:
Clone this repository and open the .mix file with [Mixly 2.0 RC4] Get Mixly Application on (https://github.com/mixly/Mixly_Arduino)or(http://mixly.org).
Board Configuration:
Select ESP8266 under the Arduino-compatible boards.
Or drag the .mix file into the application
Port Setup:
Connect your ESP8266 board via USB and select the corresponding COM port in Mixly.

Member Contributions

Contributor	Code Sections
Zhijie Zhou	MQTT communication, alarm logic, and core structure
Linxuan Han	OLED display initialization and UI layout
Xiang Tang	Sensor simulation and MQTT subscription
Yujie Sun	Button handling and manual alarm control

Detail Contributions by Team Members:

Zhijie Zhou
- Led overall system architecture and integration.
- Implemented WiFi connectivity (WiFi.begin) and MQTT client configuration (PubSubClient setup).
- Developed MQTT callback function (callback) for handling incoming messages.
- Configured DHT sensor initialization (dht14.begin()) and alarm logic (WARNING flag management).
- Integrated simulated sensor data generation (temp2, humi2, temp3, humi3).
- Managed MQTT topic subscriptions and publications for real-time and simulated sensor data.
Linxuan Han
- Designed and implemented the OLED display interface using U8g2lib.
- Created page2() function to render live sensor readings (temperature/humidity).
- Enabled UTF-8 character support for advanced OLED display functionality.
Xiang Tang
- Configured MQTT client communication workflows and message handling.
- Developed subscription logic for MQTT control topics (button, atal, t1, h1, t2, h2).
- Implemented manual alarm control via MQTT button state (mqtt_button).
Yujie Sun
- Enhanced alarm system with dual-mode functionality (auto/manual).
- Programmed alarm tone sequences using tone() and noTone() for different alert scenarios.
- Optimized MQTT message processing logic in the loop() function.
Collaborative Contributions
- All members contributed to code documentation and annotation, ensuring clarity of individual contributions.
- Joint debugging efforts ensured seamless integration of WiFi, MQTT, sensor, and display modules.

Dependencies

Hardware:
- ESP8266 NodeMCU
- DHT11 Temperature/Humidity Sensor
- OLED SSD1306 Display (128x64)
- Buzzer (GPIO16)

Software Libraries:

#include <ESP8266WiFi.h>
#include <U8g2lib.h>
#include <DHT.h>
#include <PubSubClient.h>

Installation & Usage

(Arduino)

Install Libraries:
Use Arduino IDE to install required libraries:
- ESP8266WiFi
- U8g2
- DHT sensor library
- PubSubClient

Configure Parameters:
Update WiFi credentials and MQTT settings in the code:

const char *mqtt_broker = "your-mqtt-broker-url";
const char *mqtt_username = "your-username";
const char *mqtt_password = "your-password";

Upload Code:
Compile and upload the code to your ESP8266 board using Mixly or Arduino IDE.

Web Interface

Share Key 3024e9 Share Link https://mixio.mixly.cn/observe?sid=3024e9 Web Interface Overview 1 Web Interface Overview 2

Testing

Sensor Validation:
Verify temperature/humidity readings on the OLED display.
Alarm Trigger:
Simulate threshold breaches by adjusting t1, t2, h1, h2 values via MQTT.
Buzzer Test:
Send {"button": "1"} via MQTT to activate the buzzer manually.

Contact

For issues or contributions, contact:

GitHub: Zhijie Zhou
Email: zhouz66@coventry.ac.uk

CUH405CMD2425FEBJUL/C1T9_MQTT-MuseumTempHumiMonitor

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