ESP8266 Serial WIFI Module

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Overview

IM140905002 1.jpg
ESP8266 offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.

When ESP8266 hosts the application, and when it is the only application processor in the device, it is able to boot up directly from an external flash. It has integrated cache to improve the performance of the system in such applications, and to minimize the memory requirements.

Alternately, serving as a Wi-Fi adapter, wireless internet access can be added to any microcontroller-based design with simple connectivity through UART interface or the CPU AHB bridge interface.

ESP8266 on-board processing and storage capabilities allow it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. With its high degree of on-chip integration, which includes the antenna switch balun, power management converters, it requires minimal external circuitry, and the entire solution, including front-end module, is designed to occupy minimal PCB area.

Sophisticated system-level features include fast sleep/wake context switching for energy-efficient VoIP, adaptive radio biasing for low-power operation, advance signal processing, and spur cancellation and radio co-existence features for common cellular, Bluetooth, DDR, LVDS, LCD interference mitigation.

Go shopping ESP8266 Serial WIFI Module(IM140905002)

Features

  • 802.11 b/g/n protocol
  • Wi-Fi Direct (P2P), soft-AP
  • Integrated TCP/IP protocol stack
  • Integrated TR switch, balun, LNA, power amplifier and matching network
  • Integrated PLL, regulators, and power management units
  • +19.5dBm output power in 802.11b mode
  • Integrated temperature sensor
  • Supports antenna diversity
  • Power down leakage current of < 10uA
  • Integrated low power 32-bit CPU could be used as application processor
  • SDIO 2.0, SPI, UART
  • STBC, 1×1 MIMO, 2×1 MIMO
  • A-MPDU & A-MSDU aggregation & 0.4s guard interval
  • Wake up and transmit packets in < 2ms
  • Standby power consumption of < 1.0mW (DTIM3)

Electronic Characteristics

1.Current Consumption

The following current consumption is based on 3.3V supply, and 25℃ ambient, using internal regulators. Measurements are done at antenna port without SAW filter. All the transmitter’s measurements are based on 90% duty cycle, continuous transmit mode.

Mode Min Typ Max Unit
Transmit 802.11b, CCK 1Mbps, POUT=+19.5dBm 215 mA
Transmit 802.11b, CCK 11Mbps, POUT=+18.5dBm 197 mA
Transmit 802.11g, OFDM 54Mbps, POUT =+16dBm 145 mA
Transmit 802.11n, MCS7, POUT=+14dBm 135 mA
Receive 802.11b, packet length=1024 byte, -80dBm 60 mA
Receive 802.11g, packet length=1024 byte, -70dBm 60 mA
Receive 802.11n, packet length=1024 byte, -65dBm 62 mA
Standby 0.9 mA
Deep sleep 10 uA
Power save mode DTIM 1 1.2 mA
Power save mode DTIM 3 0.86 mA
Total shutdown 0.5 uA

2.RF Performance

The following are measured under room temperature conditions with 3.3V and 1.1V power supplies.

Description Min Typical Max Unit
Input frequency 2412 2484 MHz
Input impedance 50 Ω
Input reflection -10 dB
Output power of PA for 72.2Mbps 14 15 16 dBm
Output power of PA for 11b mode 17.5 18.5 19.5 dBm
Sensitivity
CCK, 1Mbps -98 dBm
CCK, 11Mbps -91 dBm
6Mbps (1/2 BPSK) -93 dBm
54Mbps (3/4 64-QAM) -75 dBm
HT20, MCS7 (65Mbps, 72.2Mbps) -71 dBm

Hardware

IM140905002pic1.jpg

Schematic

ESP8266 Schematic.jpg

Application Notes

  • Smart power plugs
  • Home automation
  • Mesh network
  • Industrial wireless control
  • Baby monitors
  • IP Cameras
  • Sensor networks
  • Wearable electronics
  • Wi-Fi location-aware devices
  • Security ID tags
  • Wi-Fi position system beacons

AT Commands

Format

  • Baud rate at 57600
  • x is the commands
Set Inquiry Test Execute
AT+<x>=<…> AT+<x>? AT+<x>=? AT+<x>
AT+CWMODE=<mode> AT+CWMODE? AT+CWMODE=? -
Set the network mode Check current mode Return which modes supported -

Commands

  • carefully there are must be no any spaces between the " and IP address or port

Commands

Description

Type

Set/Execute

Inquiry

test

Parameters and Examples

AT

general test

basic

-

-

-

-

AT+RST

restart the module

basic

-

-

-

-

AT+GMR

check firmware version

basic

-

-

-

-

AT+CWMODE

wifi mode

wifi

AT+CWMODE=<mode>

AT+CWMODE?

AT+CWMODE=?

1= Sta, 2= AP, 3=both, Sta is the default mode of router, AP is a normal mode for devices

AT+CWJAP

join the AP

wifi

AT+ CWJAP =<ssid>,< pwd >

AT+ CWJAP?

-

ssid = ssid, pwd = wifi password

AT+CWLAP

list the AP

wifi

AT+CWLAP

AT+CWQAP

quit the AP

wifi

AT+CWQAP

-

AT+CWQAP=?

AT+ CWSAP

set the parameters of AP

wifi

AT+ CWSAP= <ssid>,<pwd>,<chl>, <ecn>

AT+ CWSAP?

ssid, pwd, chl = channel, ecn = encryption; eg. Connect to your router: AT+CWJAP="www.electrodragon.com","helloworld"; and check if connected: AT+CWJAP?

AT+CWLIF

check join devices' IP

wifi

AT+CWLIF

-

-

AT+ CIPSTATUS

get the connection status

TCP/IP

AT+ CIPSTATUS

<id>,<type>,<addr>,<port>,<tetype>= client or server mode

AT+CIPSTART

set up TCP or UDP connection

TCP/IP

1)single connection (+CIPMUX=0) AT+CIPSTART= <type>,<addr>,<port>; 2) multiple connection (+CIPMUX=1) AT+CIPSTART= <id><type>,<addr>, <port>

-

AT+CIPSTART=?

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

AT+CIPMODE

set data transmission mode

TCP/IP

AT+CIPMODE=<mode>

AT+CIPSEND?

0 not data mode, 1 data mode; return "Link is builded"

AT+CIPSEND

send data

TCP/IP

1)single connection(+CIPMUX=0) AT+CIPSEND=<length>; 2) multiple connection (+CIPMUX=1) AT+CIPSEND= <id>,<length>

AT+CIPSEND=?

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

AT+CIPCLOSE

close TCP or UDP connection

TCP/IP

AT+CIPCLOSE=<id> or AT+CIPCLOSE

AT+CIPCLOSE=?

AT+CIFSR

Get IP address

TCP/IP

AT+CIFSR

AT+ CIFSR=?

AT+ CIPMUX

set mutiple connection

TCP/IP

AT+ CIPMUX=<mode>

AT+ CIPMUX?

0 for single connection 1 for multiple connection

AT+ CIPSERVER

set as server

TCP/IP

AT+ CIPSERVER= <mode>[,<port> ]

mode 0 to close server mode, mode 1 to open; port = port; eg. turn on as a TCP server: AT+CIPSERVER=1,8888, check the self server IP address: AT+CIFSR=?

AT+ CIPSTO

Set the server timeout

AT+CIPSTO=<time>

AT+CIPSTO?

<time>0~28800 in second

+IPD

received data

For Single Connection mode(CIPMUX=0): + IPD, <len>:
For Multi Connection mode(CIPMUX=1): + IPD, <id>, <len>: <data>

Download

Instruction

Upgrading ESP8266 Firmware

We provide a ESP8266 firmware upgrading tools here. Please download and install it in your computer. You should pay attention that this software is chinese version and it only runs on Windows environment.

File:ESP8266Flasher-x86-v0.9.2.3.zip

1. Connect your ESP8266 module as follows:

  • Vcc = 3.3V (needs around 300-400mA peak)
  • Gnd = -ve ground
  • CH_PD = Chip enable so always +ve
  • RST = Leave floating or ground to reset
  • GPIO0 = Normally floating but this needs to be grounded when you start the update.
  • GPIO2 = high level
  • UTXD = Tx data connect to Txd on FTDI/Serial interface
  • URXD = Rx data connect to Rx of FTDI/Serial interface

2. Open the software, choose the right COM and click the button that is circled in the following picture. When a tick appears in the bottom-left corner, it suggests that the firmware upgrade successfully.

Upgrade Firmware.jpg

3. This software contains an existing firmware, but if you want to upgrade other ESP8266 firmware, please click the button that is circled in the following picture, and only two file paths are available to choose.

Upgrade Firmware 1.jpg

Other ways of ESP8266 firmware upgrading

Useful Link

Reference:

Example of Using it

Demos for ESP8266

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