#define BLYNK_PRINT Serial // Enable debug output to Serial Monitor #include <ESP8266WiFi.h> // ESP8266's Wi-Fi library #include <BlynkSimpleEsp8266.h> // Blynk + ESP8266 magic
#include <DHT.h> DHT dht(D1, DHT11); void setup() dht.begin(); timer.setInterval(2000L, sendSensor); // BlynkTimer library
void loop() Blynk.run(); // Keep Blynk running (handles incoming commands) // Your other code here blynksimpleesp8266 h
// Your credentials from the Blynk app char auth[] = "YourAuthTokenHere"; char ssid[] = "YourWiFiSSID"; char pass[] = "YourWiFiPassword";
void sendSensor() float h = dht.readHumidity(); float t = dht.readTemperature(); Blynk.virtualWrite(V5, t); Blynk.virtualWrite(V6, h); #define BLYNK_PRINT Serial // Enable debug output to
✅ ❌ Do NOT use it for the new Blynk IoT platform. 3. Basic Code Structure Here is a minimal working example for connecting an ESP8266 to Blynk Legacy:
It tells the Blynk engine how to send and receive data over Wi-Fi using the ESP8266's ESP8266WiFi.h and WiFiClient.h libraries. 2. When Should You Use This? (Important Version Note) ⚠️ CRITICAL: Blynk has two major versions. | Feature | Blynk Legacy (1.0) | Blynk IoT (2.0) | | :--- | :--- | :--- | | Header File | <BlynkSimpleEsp8266.h> | <BlynkSimpleEsp8266_SSL.h> or BlynkEdgent.h | | Auth Method | Static Auth Token | Dynamic Provisioning + Device ID/Token | | App | Blynk Legacy (blue icon) | Blynk IoT (new purple icon) | | Server | blynk-cloud.com:8080 | blynk.cloud:443 | | Feature | Blynk Legacy (1
void setup() Serial.begin(115200); delay(100);