In this small series I will show you how to use Arduino IDE with ESP8266 and log your temperature data to the MySql server trough Node Red. And for data transmission we will use MQTT.

  1. Installing the Addon With the Arduino Boards Manager. Open up Arduino, then go to the Preferences (File > Preferences). Then, towards the bottom of the window, copy this URL into the “Additional Board Manager URLs” text box: 
    http://arduino.esp8266.com/stable/package_esp8266com_index.json

  2. Hit OK. Then navigate to the Board Manager by going to Tools > Boards > Boards Manager. There should be a couple new entries in addition to the standard Arduino boards. Look for esp8266. Click on that entry, then select Install.
  3. When the board is installed Select “NodeMCU 1.0” from the Tools > Boards menu.
  4. Then select your port number under the Tools > Port menu.
  5. Now lets upload a blink sketch for a test. 
    void setup() {
  pinMode(LED_BUILTIN, OUTPUT);     // Initialize the LED_BUILTIN pin as an output
}

void loop() {
  digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on (Note that LOW is the voltage level
                                    // but actually the LED is on; this is because 
                                    // it is acive low on the ESP-01)
  delay(1000);                      // Wait for a second
  digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off by making the voltage HIGH
  delay(2000);                      // Wait for two seconds (to demonstrate the active low LED)
}

    For faster upload you can choose Tools > Upload Speed > 921600 but faster upload speed can be slightly less reliable.

After uploading the sketch the led will blink and we are ready to get to the next step…