Home Temperature & Humidity Monitor with Raspberry Pi & Web Dashboard – Real‑Time Remote Tracking

Track the temperature and humidity of your home, garage, or small factory from anywhere with this straightforward Raspberry Pi solution. The system streams real‑time data to a web‑based chart, giving you instant insight into your environment.

Step 1: The Concept

• The Raspberry Pi reads temperature and humidity using a DHT11 sensor.
• Data is sent to a web server via a raw JSON POST request.
• Information is stored in a MySQL database and visualized on a live chart.
• Users can monitor trends and receive alerts through the web interface.

Step 2: Required Items & Pre‑Requests

• 1× DHT11 sensor
• 1× Raspberry Pi B (any recent model) with Raspbian OS
• Jumper wires
• Internet connectivity (Wi‑Fi or Ethernet)
• Python 3 and the RPi.GPIO library installed
• Web server stack (Apache + MySQL + PHP) on Ubuntu or CentOS

Step 3: Connecting the Device

• Power off the Pi before wiring.
• Connect VCC to 3.3 V, GND to ground, and DATA to GPIO 4.
• Power on the Raspberry Pi.

Step 4: Configure the Python Script on the Raspberry Pi

Access the Pi via SSH or directly. Create a working directory (e.g., ~/Desktop) and add the script:

nano dht11.py

Copy the contents of the provided dht11.py file into the editor. The script includes inline comments explaining each function.

Set the web server IP (example: 104.236.91.122) and PHP endpoint (/rpi/rpi.php) within the script.

Step 5: Set Up the PHP Web Service

Extract the rpi.rar package and upload the files to your web server.

Use phpMyAdmin to create a new database, e.g., rpi_themo. Import the pi.sql file to populate the necessary tables.

Update database credentials in the following files:

1. rpi/db-con.php
2. rpi/temp/assets/php/getTemp.php

Step 6: Test the System

Navigate to the script’s directory and run:

sudo python3 dht11.py

A successful run will output:

New record created successfully

If you see no_data, it indicates a temporary transmission issue. Re‑run the script; subsequent attempts usually resolve the error.

Once data is recorded, open your web dashboard to view live temperature and humidity charts.

For deeper insights, consult the original guide: Home Temperature & Humidity Monitor with Web-Based Chart – Raspberry Pi.