Difference between revisions of "ESP8266 Serial WIFI Module"

From ITEAD Wiki
Jump to: navigation, search
(Created page with "==Overview== rightESP8266 offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or...")
(No difference)

Revision as of 09:18, 16 September 2014

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)]


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

Firmware & Software Development Kit

The application and firmware is executed in on-chip ROM and SRAM, which loads the instructions during wake-up, through the SDIO interface, from the external flash. The firmware implements TCP/IP, the full 802.11 b/g/n/e/i WLAN MAC protocol and Wi-Fi Direct specification. It supports not only basic service set (BSS) operations under the distributed control function (DCF) but also P2P group operation compliant with the latest Wi-Fi P2P protocol. Low level protocol functions are handled automatically by ESP8266:

  • RTS/CTS
  • acknowledgement
  • fragmentation and defragmentation
  • aggregation
  • frame encapsulation (802.11h/RFC 1042)
  • utomatic beacon monitoring / scanning
  • P2P Wi-Fi direct

Passive or active scanning, as well as P2P discovery procedure is performed autonomously once initiated by the appropriate command. Power management is handled with minimum host interaction to minimize active duty period.

Features:

  • 802.11 b/g/n/d/e/i/k/r support;
  • Wi-Fi Direct (P2P) support:
  • P2P Discovery, P2P Group Owner mode, P2P Power Management
  • Infrastructure BSS Station mode / P2P mode / softAP mode support;
  • Hardware accelerators for CCMP (CBC-MAC, counter mode), TKIP (MIC, RC4), WAPI (SMS4), WEP (RC4), CRC;
  • WPA/WPA2 PSK, and WPS driver;
  • Additional 802.11i security features such as pre-authentication, and TSN;
  • Open Interface for various upper layer authentication schemes over EAP such as TLS, PEAP, LEAP, SIM, AKA, or customer specific;
  • 802.11n support (2.4GHz / 5GHz);
  • Supports MIMO 11 and 21, STBC, A-MPDU and A-MSDU aggregation and 0.4s guard interval;
  • WMM power save U-APSD;
  • Multiple queue management to fully utilize traffic prioritization defined by 802.11e standard;
  • UMA compliant and certified;
  • 802.1h/RFC1042 frame encapsulation;
  • Scattered DMA for optimal CPU off load on Zero Copy data transfer operations;
  • Antenna diversity and selection (software managed hardware);
  • Clock/power gating combined with 802.11-compliant power management dynamically adapted to curent connection condition providing minimal power consumption;
  • Adaptive rate fallback algorithm sets the optimium transmission rate and Tx power based on actual SNR and packet loss information;
  • Automatic retransmission and response on MAC to avoid packet discarding on slow host environment;
  • Seamless roaming support;
  • Configurable packet traffic arbitration (PTA) with dedicated slave processor based design provides flexible and exact timing Bluetooth co-existence supoport for a wide range of Bluetooth Chip vendors;
  • Dual and single antenna Bluetooth co-existence support with optional simultaneous receive (Wi-Fi/Bluetooth) capability.

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

File:ESP8266_Specifications_English.pdf File:ESP8266 Specifications(Chinese).pdf

Useful Link

Reference: