Wifi Module (esp11)

User Manual: wifi module (esp11)

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ESP8266 WiFi Module
Technical Manual Rev 1 r0

The ESP8266 Wifi module is a complete Wi­Fi
network where you can easily connect as a serving Wi­
Fi adapter, wireless internet access interface to any
microcontroller­based design on its simple connectivity
through Serial Communication or UART interface.

Input Supply: + 3.3VDC
IC: ESP8266
Interface: Serial Communication
PCB Dimensions: 21mm x 13.2mm

FEATURES:
802.11 b/g/n protocol
Wi­Fi Direct (P2P), soft­AP
Integrated TCP/IP protocol

GENERAL SPECIFICATIONS:

Integrated low power 32-bit CPU
SDIO 2.0, SPI, UART

Pages 1 of 6 pages

©201 5 by e-Gizmo Mechatronix Central

ESP11 WIFI Module ESP8266

Major Parts presentation

Figure 1. Major Parts placement of Wifi Module & its major Components.
The WiFi module requires a 3.3V power supply
*Note: do not connect the wifi module to the 5V, the wifi module does not have a 5V tolerant inputs.

Table 1. Pin Descriptions

Pages 2 of 6 pages

PIN NAME

DESCRIPTIONS

VIN
GPIO2
GPIO0
TX
RX
RESET
ENABLE
GND

+3.3 V DC Input Supply
Other
Bootloader, for Firmware updates
Transmit
Received
Reset pin
Enable the Wifi (Active­HIGH)

Ground

©201 5 by e-Gizmo Mechatronix Central

ESP11 WIFI Module ESP8266

Controller Operation & Menu Settings

FOR BOOTLOADING:
1. Use a PL2303 driver or FDTI driver.
2. Wiring connections:
UART to ESP module
RX
to TX
TX
to RX
GND to GND
3.3V to 3.3V or use AMS2950 IC
3. Dont forget to put a GND to GPIO0-bootloader.
Before you start to download the firmware.

Figure 2. WiFi module connected to a Gizduino microcontroller

To connect the Wifi module to the Gizduino microcontroller:
connect the red wire to VIN(3.3V) to the +3.3V power from the microcontroller.
connect the black wire to the ground.
connect the green wire to the TX of the Wifi module and microcontroller
connect the yellow wite to the RX of the wifi module and microcontroller

Pages 3 of 6 pages

©201 5 by e-Gizmo Mechatronix Central

ESP11 WIFI Module ESP8266

AT Commands

Table 2. AT Commands for ESP8266
Commands

Description

AT+RST

restart the module

basic

AT+CWMODE

wifi mode

wifi

AT+CWJAP

join the AP

wifi

AT+CWLAP

list the AP

wifi

AT+CWQAP

quit the AP

wifi

AT+CIPSTATUS

get the connection
status

TCP/IP

AT+CIPSTART

set up TCP or
UDP connection

TCP/IP

AT+CIPSEND

send data

TCP/IP

AT+CIPCLOSE

close TCP or

TCP/IP

AT+CIFSR

Get IP address

TCP/IP

AT+CIPMUX

set multiple
connections

TCP/IP

AT+CIPSERVER

Pages 4 of 6 pages

set as server

Type

TCP/IP

©201 5 by e-Gizmo Mechatronix Central

ESP11 WIFI Module ESP8266

AT Commands & Examples

AT+CWMODE

AT+CIPSTATUS

Inquiry: AT+CWMODE?

Inquiry: AT+CWSTATUS?

Test: AT+CWMODE=?

Set: AT+CIPSTATUS

Parameters:
1 = Status, 2 = AP, 3 = both

AT+CIPSTART
Test: AT+CIPSTART?
Set:
1. Single connection (+CIPMUX=0)
AT+CIPSTART=,,
2. Multiple connection (+CIPMUX=1)
AT+CIPSTART=,,,

AT+CWJAP
Inquiry: AT+CWJAP?
Set: AT+CWJAP = ,
Parameters:
ssid = ssid, pwd = wifi password

AT+CWQAP

Parameters:
id = 0­4, type = TCP/UDP,
addr = IP address,
port = port
Examples:
Connect to another TCP server, set multiple
connection first:
AT+CIPMUX = 1
connect:
AT+CIPSTART = 4,"TCP","X1.X2.X3.X4",9999

Test: AT+CWQAP=?

AT+CWSAP
Inquiry: AT+CWSAP?

AT+CIPSEND

Set:
AT+CWSAP = ,,,

Test: AT+CIPSEND=?

Parameters:
ssid = ssid, chl = channel,
ecn = encryption

Set:
1. Single connection (+CMMUX=0)
AT+CIPSEND=
2. Multiple connection (+CIPMUX=1)
AT+CIPSEND=,

Examples:
Connect to your router:
AT+CWJAP = "YOUR SSID","helloword"
Check if connected:
AT+CWJAP?

Pages 5 of 6 pages

Examples:
send data:
AT+CIPSEND=4,15 and then enter the data

©201 5 by e-Gizmo Mechatronix Central

ESP11 WIFI Module ESP8266

AT Commands & Examples

AT+CIPCLOSE
Test: AT+CIPCLOSE=?
Set: AT+CIPCLOSE= or AT+CIPCLOSE
AT+CIFSR
Test: AT+CIFSR=?
Set: AT+CIFSR
AT+CIPMUX
Inquiry: AT+CIPMUX=?
Set: AT+CIPMUX=
Parameters:
0 for single connection
1 for multiple connection
AT+CIPSERVER
Set: AT+CIPSERVER=[,]
Parameters:
mode 0 to close server mode
mode 1 to open
port = port
Examples:
Turn on as a TCP server:
AT+CIPSERVER=1,8888
check the self server IP address:
AT+CIFSR=?

Pages 6 of 6 pages

©201 5 by e-Gizmo Mechatronix Central

ESP11 WIFI Module ESP8266
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