Wi-Fi Weather Display

Wi-Fi Weather Display

Image: NodeMCU DEVKIT 0.8.JPG by Vowstar via Wikimedia Commons, CC BY-SA 4.0

How It Works

• The ESP8266/ESP32 connects to Wi-Fi and makes an HTTPS request to a weather API (such as OpenWeatherMap) for a chosen city.
• The API responds with weather data in JSON format, which the microcontroller parses to extract temperature, humidity, and condition text.
• The parsed values are shown on an LCD or OLED display, refreshed at a set interval (e.g. every 10 minutes) to keep the current reading up to date.
• Because the data comes from an internet weather service rather than a local sensor, the same device design can show weather for any city, just by changing the API query location.

Components

ESP8266 or ESP32
16x2 LCD or OLED display
Weather API access (e.g. OpenWeatherMap free tier)
Power supply

Applications

• Desk or wall-mounted weather display for any city
• Teaching API integration and JSON parsing on embedded hardware
• Travel/remote-location weather dashboards

Advantages

• No physical weather sensors needed, works for any city with internet access
• Simple to reconfigure for a different location
• Demonstrates real-world API integration on embedded hardware

Sample Code — Fetching and Displaying Weather Data

// Simplified weather API fetch - ESP8266
#include 
#include 

void setup() {
  Serial.begin(9600);
  WiFi.begin("SSID", "PASSWORD");
  while (WiFi.status() != WL_CONNECTED) delay(500);
}

void loop() {
  HTTPClient http;
  http.begin("http://api.openweathermap.org/data/2.5/weather?q=Thiruvananthapuram&appid=YOUR_KEY&units=metric");
  int code = http.GET();
  if (code == 200) {
    String payload = http.getString();
    // parse JSON for "temp" and "humidity", show on LCD/OLED
    Serial.println(payload);
  }
  http.end();
  delay(600000); // refresh every 10 minutes
}

Related Research

• Designing ESP8266 Weather Station Using OpenWeatherMap — EngineersGarage (build guide)