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Arduino Killer ESP8266 Based NodeMCU The ESP8266 WiFi Module is an embedded SOC with integrated TCP/IP protocol stack. It helps   microcontrollers  access to your WiFi network. IoT devices exploits this facility. Lot of firmwire you can use with ESP8266. Many ESP8266 comes with AT firmware for serial communications. NodeMCU is one of them, which supports lua programming language. Latest ESP8266 boards contains plenty of I/O lines and ADC,PWM, I2C,SPI  features like Arduino. It is very cheap($3-Rs.180) All of the above board build with ESP8266. Almost all are same.

Arduino NodeMcu ESP8266 Pin Mapping    Arduino NodeMcu (ESP8266) Pin Mapping    If you use NodeMcu borad with Arduino IDE the following chart will help to find the pin maping eg. NodeMCU Pin D1 is equivalent to arduino Pin 5.  Built in LED of NodeMCU is connected to D4 in arduino programming it equivalent to Pin 2   NodeMCU Arduino D0 = 16 D1 = 5 D2 = 4 D3 = 0 D4 = 2 D5 = 14 D6 = 12 D7 = 13 D8 = 15 D9 = 3 D10 = 1