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Author: khoih-prog

README.md

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+## Blynk_ESP_WM
+I'm inspired by [EasyBlynk8266] (https://github.com/Barbayar/EasyBlynk8266)
+ 
+To help you to eliminate hardcoding your Wifi and Blynk credentials for ESP8266 and ESP32 (with / wwithout SSL), and updating/reflashing every time when you need to change them.
+
+Just copy BlynkSimpleEsp8266_WM.h, BlynkSimpleEsp8266_SSL_WM.h, BlynkSimpleEsp32_WM.h and BlynkSimpleEsp32_SSL_WM.h into Blynk libraries directory (normally ./libraries/Blynk/src)
+
+In your code, replace
+1. BlynkSimpleEsp8266.h     with BlynkSimpleEsp8266_WM.h      for ESP8266 without SSL
+2. BlynkSimpleEsp8266_SSL.h with BlynkSimpleEsp8266_SSL_WM.h  for ESP8266 with SSL
+3. BlynkSimpleEsp32.h       with BlynkSimpleEsp32_WM.h        for ESP32 without SSL
+4. BlynkSimpleEsp32_SSL.h   with BlynkSimpleEsp32_SSL_WM.h    for ESP32 with SSL
+
+and replace
+
+, `Blynk.begin(...)` with `Blynk.begin()` in your code. Keep `Blynk.run()`.
+
+That's it.
+
+## So, how it works?
+If it cannot connect to the Blynk server in 30 seconds, it will switch to `Configuration Mode`. You will see your built-in LED turned ON. In `Configuration Mode`, it starts an access point called `ESP_xxxxxx`. Connect to it using password `MyESP_xxxxxx` .
+
+<p align="center">
+    <img src="https://user-images.githubusercontent.com/???/???.png">
+</p>
+
+After you connected, please, go to http://192.168.4.1. You will see a page showed as below.
+<p align="center">
+    <img src="https://user-images.githubusercontent.com/???/???.png">
+</p>
+
+Enter your credentials, then click `Save`. After you restarted, you will see your built-in LED turned OFF. That means, it connected to your Blynk server successfully.
+
+In operation, if WiFi or Blynk connection is lost, `Blynk.run()` will try reconnecting automatically.
+
+This `Blynk.begin()` is not a blocking call, so you can use it for critical functions requiring in loop(). 
+Anyway, this is better for projects using Blynk just for graphical user interface.
+
+## Prerequisite
+* ESP8266 core for Arduino https://github.com/esp8266/Arduino#installing-with-boards-manager
+* Blynk library https://www.arduino.cc/en/guide/libraries#toc3
+
+## Hello World
+Please take a look at examples, as well.
+```
+#include <BlynkSimpleEsp8266_WM.h>
+
+void setup() 
+{
+    Blynk.begin();
+}
+
+
+void loop() 
+{
+    Blynk.run();
+}
+```

examples/DHT11ESP8266/DHT11ESP8266.ino

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+#include <BlynkSimpleEsp8266_WM.h>
+#include <DHT.h>
+
+#define DHT_PIN     2
+#define DHT_TYPE    DHT11
+
+#define DHT_DEBUG   1
+
+DHT dht(DHT_PIN, DHT_TYPE);
+BlynkTimer timer;
+
+void readAndSendData() 
+{
+    float temperature = dht.readTemperature();
+    float humidity    = dht.readHumidity();
+    
+
+    if (!isnan(temperature) && !isnan(humidity)) 
+    {
+      Blynk.virtualWrite(V0, temperature);
+      Blynk.virtualWrite(V1, humidity);
+    }
+    else
+    {
+      Blynk.virtualWrite(V0, -100);
+      Blynk.virtualWrite(V1, -100);
+    }
+}
+
+void setup() 
+{
+    dht.begin();
+    Blynk.begin();
+    timer.setInterval(60 * 1000, readAndSendData);
+}
+
+void loop() 
+{
+    Blynk.run();
+    timer.run();
+}