Arduino UNO R3 ESP8266, Manual, Page: 4 / 10

4
Connecting to Arduino Uno using voltage conversion chip, making 3.3V and 5V
compatible.
3) The serial port is controlled by dual DIP switch, so that the shield can be used alone as an
Arduino Uno expansion board or as an ESP8266 expansion board.
4) Configure WiFi and serial port parameters based on Web Server.
5) Can be used as an independent ESP8266 development board, to download the official AT
command firmware, NodeMCU open source firmware, etc.
6) Can be used as a standalone Arduino Uno shield, leading out all the pins.
3. Technical Specifications
1) Supporting wireless 802.11 b / g / n standards.
2) Supporting STA / AP two operating modes
3) Built-in TCP / IP protocol stack, you can configure a socket.
4) Supporting standard TCP / UDP Server and Client.
5) Supporting the baud rate of serial port as
6) 1200/2400/4800/9600/19200/38400/57600/74800/115200 bps.
7) Serial data: 5/6/7/8 bit.
8) Serial parity: without
9) Serial port stop bit: 1/2 bit
10) Standard Arduino Uno, Mega pin pitch
11) Lead Arduino Pin 2/3/4/5/6/7/8/9/10/11/12/13
12) Lead ESP8266 GPIO 0/2/4/5/9/10/12/13/14/15/16 / ADC / EN / UART / TX / UART RX
/ UART
13) RESET button
14) KEY button for multiplexing configuration function.
15) Dual DIP switch can achieve the Arduino and ESP8266 serial port expansion switching.
16) WiFi operating current: continuous transmission ≈ 700mA (200mA MAX), standby
<200uA.