The Development Kit based on ESP8266, integrates GPIO, PWM, IIC, 1-Wire and ADC all in one board. Power your development in the fastest way combine with NodeMCU Firmware! R2 version had CP2102 USB-TTL instead, larger current support, slim board can put on breadboard. Programing it with Arduino IDE.

Note: NO need to install driver for CH341 (replaced by CP2102), and NO need to flash firmware when you get it and use on first time. This is different with version R1.

1. ESP8266 has IO Pin 
2. No need to download resetting! 
3. A great set of tools to develop ESP8266! 
4. Data download: Hardware and software open source. 

Easily connect Servo motors, Sensors, and Bluetooth/RF modules to your Arduino or Arduino Compatible board. This Sensor Shield provides breakout connectors for standard Servo Motors and various 3-pin Sensors. A 5v DC screw terminal enables you to drive power hungry servo motors with an additional 5v DC power supply. Standard Arduino Shield form factor fits perfectly on top of the Arduino UNO and Mega. Pin Outs: For detailed Pin Outs, visit OSEPP.COM to download schematic

Breakout Boards- ESP8266 wifi module