Overview
This project is an IoT weather station built using the ESP8266 microcontroller, designed to collect temperature and humidity data and publish it online for logging and graphing. It is an upgrade from a previous Arduino-based weather station, adding Wi-Fi connectivity and the ability to use an outdoor-rated sensor probe.
Key Components
- ESP8266 development board — Low-power microcontroller with built-in Wi-Fi
- AM2315 Temperature & Humidity Sensor — Water-resistant probe suitable for outdoor use
- 4x Female-to-female jumper wires
Wiring
The wiring is simple with only 4 connections:
| Wire Color | ESP8266 Pin | Function |
|---|---|---|
| Red | 3.3V | Power |
| Black | GND | Ground |
| White | D1 | Data |
| Yellow | D2 | Clock |
Attach one end of the 4 jumper wires to the 4 connections coming out of the AM2315 sensor… plug the other ends into the ESP8266.
Software Setup
The project uses two code files:
- ESP8266Weather.ino — Handles data collection and transmission
- config.h — Stores Wi-Fi credentials and Adafruit IO keys
Code available on GitHub repository
Adafruit IO Configuration
To use this project, you need:
- Adafruit IO account — Sign up at accounts.adafruit.com
- API Key & Username — Found under “My Key” section; paste into config.h
- Wi-Fi credentials — SSID and password entered in config.h
Required Feeds
Create two feeds on Adafruit IO:
- Temperature_AM2315
- Humidity_AM2315
Dashboard Setup
- Go to Dashboards → View All → New Dashboard
- Add Line Chart Blocks for each feed
- Customize time frame (e.g., 24 hours)
Deployment
- Connect ESP8266 to PC via USB
- Select correct COM port in Arduino IDE (Tools → Port)
- Upload code
- Power via phone charger or USB connection
The small wires coming out of the sensor are thin enough to fit through the side of my window so I didn’t need to put the sensitive stuff outside.
Live Data
View the live weather data on the Adafruit IO Dashboard.
Related Projects
- Arduino Weather Station — The original version