ESP8266 DHT22 Web Server

This project reads temperature and humidity from a DHT22 sensor using an ESP8266 and provides a web dashboard as well as a JSON API endpoint.

Features

• Web dashboard at / (shows temperature, humidity, and ESP8266 IP)
• JSON API data at /data
• mDNS support: access as http://albert.local/ (if supported by your network)
• Easy, secure local WiFi credentials with arduino_secrets.h
• Onboard LED indicates web/API requests

Circuit Connections

DHT22 Pin	ESP8266 Pin
- (GND)	GND
+ (VCC)	3.3V
out	D1 (GPIO5)

Library Dependencies

• ESP8266WiFi
• ESP8266WebServer
• ESP8266mDNS
• Adafruit DHT sensor library

All available in the Arduino Library Manager.

Usage

1. Clone or download this repo

2. Add your WiFi credentials

   Copy this to a new file named arduino_secrets.h (do not commit this file!):