Module 10 // REST JSON

Wi-Fi Network Local Weather Station

Connects ESP8266 processors to remote HTTP weather APIs to parse localized temperature arrays over JSON object structures.

SSD1306 Display Core Interfaces

OLED Screen Pin	Data Vector	ESP8266 Module Target Pin
SDA (Data Wire)	<====>	GPIO 4 (D2)
SCL (Clock Wire)	====>	GPIO 5 (D1)

API JSON Extraction Firmware

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>

const char* ssid = "WIFI_SSID";
const char* pass = "WIFI_PASSWORD";

void setup() {
 Serial.begin(115200);
 WiFi.begin(ssid, pass);
 while (WiFi.status() != WL_CONNECTED) { delay(500); }
}

void loop() {
 if (WiFi.status() == WL_CONNECTED) {
  WiFiClient client; HTTPClient http;
  http.begin(client, "http://api.openweathermap.org/data/2.5/weather?q=Mumbai,IN&APPID=YOUR_KEY&units=metric");
  if (http.GET() > 0) {
   DynamicJsonDocument doc(1024);
   deserializeJson(doc, http.getString());
   float temp = doc["main"]["temp"];
   Serial.print("Parsed Temp Metric Array: "); Serial.println(temp);
  }
  http.end();
 }
 delay(60000);
}