IoT Bytes

Bits and Bytes of IoT

ESP8266 Pinout

Pradeep Singh | 4th April 2016

pins

ESP8266 Pins (component side up):

esp8266-5


Following are the details of each of these Pins –

Pin Description
VCC 3.3V (3.6V Max) Power Supply Pin
GND Ground Pin
Tx Data Transmit Pin (Works at 3.3V)
Rx Data Receive Pin (Works at 3.3V)
CH_PD Chip Power Down Pin. (LOW = Power Down, HIGH = Power UP). Connect this Pin to VCC Pin.
GPIO 0 General Purpose I/O Pin 0 (I/O Index 3)
GPIO 2 General Purpose I/O Pin 2 (I/O Index 4)
RESET Reset Pin (LOW = Reset). Pull Down this Pin by connecting it to GND Pin to reset ESP8266

ESP8266EX Chip Pinout:

ESP8266EX Chip Pins

Pin Name Type Function
1 VDDA P Analog Power 3.0 V ~ 3.6V
2 LNA I/O RF Antenna Interface
Chip Output Impedance = 50 Ω
No matching required. It is suggested to retain the π-type
matching network to match the antenna.
3 VDD3P3 P Amplifier power: 3.0 V ~ 3.6 V
4 VDD3P3 P Amplifier power:3.0 V ~ 3.6 V
5 VDD_RTC P NC (1.1 V)
6 TOUT I ADC pin. It can be used to test the power-supply voltage of
VDD3P3 (Pin3 and Pin4) and the input power voltage of
TOUT (Pin 6). However, these two functions cannot be used
simultaneously
7 CHIP_EN I Chip Enable
High: On, chip works properly
Low: Off, small current consumed
8 XPD_DCDC I/O Deep-sleep wakeup (need to be connected to EXT_RSTB;
GPIO16
9 MTMS I/O GPIO14; HSPI_CLK
10 MTDI I/O GPIO12; HSPI_MISO
11 VDDPST P Digital / IO power supply (1.8 V ~ 3.3 V)
12 MTCK I/O GPIO13; HSPI_MOSI; UART0_CTS
13 MTDO I/O GPIO15; HSPI_CS; UART0_RTS
14 GPIO2 I/O UART Tx during flash programming; GPIO2
15 GPIO0 I/O GPIO0; SPI_CS2
16 GPIO4 I/O GPIO4
17 VDDPST P Digital / IO power supply (1.8 V ~ 3.3 V)
18 SDIO_DATA_2 I/O Connect to SD_D2 (Series R: 200 Ω); SPIHD; HSPIHD;
GPIO9
19 SDIO_DATA_3 I/O Connect to SD_D3 (Series R: 200 Ω); SPIWP; HSPIWP;
GPIO10
20 SDIO_CMD I/O Connect to SD_CMD (Series R: 200 Ω); SPI_CS0; GPIO11
21 SDIO_CLK I/O Connect to SD_CLK (Series R: 200 Ω); SPI_CLK; GPIO6
22 SDIO_DATA_0 I/O Connect to SD_D0 (Series R: 200 Ω); SPI_MSIO; GPIO7
23 SDIO_DATA_1 I/O Connect to SD_D1 (Series R: 200 Ω); SPI_MOSI; GPIO8
24 GPIO5 I/O GPIO5
25 U0RXD I/O UART Rx during flash programming; GPIO3
26 U0TXD I/O UART Tx during flash programming; GPIO1; SPI_CS1
27 XTAL_OUT I/O Connect to crystal oscillator output, can be used to provide
BT clock input
28 XTAL_IN I/O Connect to crystal oscillator input
29 VDDD P Analog power 3.0 V ~ 6 V
30 VDDA P Analog power 3.0 V ~ 3.6 V
31 RES12K I Serial connection with a 12 kΩ resistor to the ground
32 EXT_RSTB I External reset signal (Low voltage level: Active)

 

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3 thoughts on “ESP8266 Pinout

  1. ​Hi,
    thanks for the useful tuto. actually i’m using two of these guys each one with an arduino in order to be able to send commands to the two arduinos via wifi thanks to the ESP’s. i configured each module separately, so i’m wondering whether they will work together once the final circuit built and how to establish the connection between them and between the pc knowing that they will work as clients and pc as a server . and more importantly, how to send instructions (code) to arduino via wifi using the ESP.
    thanks a million!

    Like

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