Information in this document, including URL references, is subject to change without notice.
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THIS DOCUMENT IS PROVIDED "AS IS" WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. All liability, including liability for infringement of any proprietary rights, relating to use of information in this document is disclaimed. No licenses express or implied, by estoppel or otherwise, to any intellectual property rights are granted herein. The Wi-Fi Alliance Member Logo is a trademark of the Wi-Fi Alliance.
Espressif Systems’ Smart Connectivity Platform (ESCP) is a set of high performance, high integration wireless SOCs, designed for space and power constrained mobile platform designers. It provides unsurpassed ability to embed Wi-Fi capabilities within other systems, or to function as a standalone application, with the lowest cost, and minimal space requirement.
Bias circuits
SRAM
PMU
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Figure 1: ESP8266EX Block Diagram
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ESP8266EX offers a complete and self-contained Wi-Fi networking solution; it can be used to host the application or to offload Wi-Fi networking functions from another application processor. When ESP8266EX hosts the application, it boots up directly from an external flash. In has integrated cache to improve the performance of the system in such applications. Alternately, serving as a Wi-Fi adapter, wireless internet access can be added to any microcontroller-based design with simple connectivity (SPI/SDIO or I2C/UART interface). ESP8266EX is among the most integrated WiFi chip in the industry; it integrates the antenna switches, RF balun, power amplifier, low noise receive amplifier, filters, power
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management modules, it requires minimal external circuitry, and the entire solution, including front-end module, is designed to occupy minimal PCB area. ESP8266EX also integrates an enhanced version of Tensilica’s L106 Diamond series 32-bit processor, with on-chip SRAM, besides the Wi-Fi functionalities. ESP8266EX is often integrated with external sensors and other application specific devices through its GPIOs; codes for such applications are provided in examples in the SDK.
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Sophisticated system-level features include fast sleep/wake context switching for energyefficient 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.
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1.1.1. Features ▪ 802.11 b/g/n protocol ▪ Wi-Fi 2.4 GHz, support WPA/WPA2 ▪ Super small module size (11.5mm x 11.5mm) ▪ Integrated 10-bit ADC ▪ Integrated TCP/IP protocol stack
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▪ Integrated TR switch, balun, LNA, power amplifier and matching network ▪ Integrated PLL, regulators, and power management units ▪ +20dBm output power in 802.11b mode ▪ Supports antenna diversity
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▪ Deep sleep power ”Developer API
发者API”: API device control instructions
“Start
始”->”Help 帮助”: Example to help user setup their own products
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“Start
“Register 注册”: New user registration
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“Login 登录”: Login if registered user
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B. After logging in, click on “Device Development 设备开发”. User can edit the settings for all the devices. “Search 搜索”: Enter device name or device key to search for device “Export 导出”: Export the device list “Create 创建”: Create a new device
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C. “Product Management 产品管理”shows the list of products. Use “Search 搜索”,
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“Product 产品”, “Status 状态” to filter and query products.
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3.1.1. Device Development
In this menu, the user can view the device history, add timer, upgrade firmware and customize reverse control.
! 3.1.1.1. Device History On the device page -> “Data Model 数据模型” -> “Data 数据” to view device history.
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3.1.1.2. Debugging Info
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“Request Log 请求⽇日志“ logs the commands received by the server and used to debug the device.
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3.1.1.3. Timer Espressif Cloud server supports 3 kinds of timers: Precise timer 精
时间: Execute a command at a specified time
Cycle Timer 周期循环: Execute a command at fixed intervals Weekly Timer 按周循环: Execute a command at weekly or on certain days each week
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3.1.1.4. Customized Reverse Control User can customize an action to reverse control the device.
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3.1.1.5. Firmware upgrade
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User update the firmware through Cloud Server
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3.1.2. Product Management
Here, the user can control the sales of products and upload firmware updates.
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In the product list, the Activated/Total number shows how many products has been activated by the customers vs the total number of products made.
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To upgrade a product’s firmware, simply upload it and Espressif Cloud Server will push the update to all devices. The user can choose to upgrade or not.
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3.2. Guide to using ESP8266EX modules 3.2.1. Software Debugging Tools
The following tools are recommended for debugging ESP8266EX modules. The user can also choose to use other similar tools. ▪ Flash programming tools: FLASH_DOWNLOAD_TOOLS.exe (provided in the SDK)
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▪ Serial Transfer tools: SecureCRTPortable.exe ▪ Network Debugging tools: NetAssist.exe
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3.2.2. Network Connections
▪ SoftAP interface:
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ESP8266EX has 2 types of network interface, softAP and station. Both can be used at the same time. Depending on the user’s actual requirements:
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Mobile phone or PC acts as station, connects to ESP8266EX through softAP interface. PC can connect to ESP8266EX serial port for debugging info. ▪ Station interface:
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ESP8266EX acts as station, connects to router (AP). PC can connect to ESP8266EX serial port for debugging info.
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3.2.3. Default Connection Parameters
▪ Default SSID: ESP_XXXXXX
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(XXXXXX are the last 6 characters of module’s MAC address)
3.3. Application Examples 3.3.1. Wi-Fi Remote Control
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Example: Mobile phone acts as station, connects to ESP8266EX through softAP. ESP8266EX can connect to device via UART and mobile phone can now control the device.
! 3.3.2. Wi-Fi Remote Access
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Example: ESP8266EX acts as station, connects through router (AP) to internet. It can then upload or download data via Cloud server. Mobile phone/tablets etc can now control ESP8266EX via Cloud server.
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Cloud server
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Router
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3.3.3. Transparent Serial
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Example: Device’s MCU as host, connects and transmits data to ESP8266EX through UART. ESP8266EX then transmits via W-Fi destination address, working in pass-through mode.
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4. AT Instruction Set 4.1. Overview Each instruction set contains four types of AT commands.
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A T+=?
Query the Set command or internal parameters and its range values.
Query
A T+?
Returns the current value of the parameter.
Set
A T+=
Set the value of user-defined parameters in commands and run.
Execute
A T+
Runs commands with no user-defined parameters.
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Test
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Note: 1. Not all AT instruction has four commands. 2. [] = default value, not required or may not appear 3. String values require double quotation marks, example AT +CWSAP=“ESP756190”,”21030826”,1,4 4. Baud rate = 115200
4.2. Basic AT Instructions
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AT
Response
Test AT startup
OK
Restart module
OK
View version info
OK
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AT+RST
Description
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Command
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AT+GMR
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Reference
= 8-digit version no.
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4.3. Wi-Fi Instructions
! Command
Description
Response
AT+CWMODE
Select Wi-Fi application mode Test AT+CWMODE=?
+CWMODE:( value list) OK
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OK Set AT+CWMODE=
OK
Back to selected AP +CWJAP:
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Query AT+CWJAP?
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OK
Set AT +CWJAP=,
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OK
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Lists available AP
Execute AT+CWLAP
Back to list of AP +CWLAP:,,
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=string value, AP name =string value, max 64 ASCII chars
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AT+CWLAP
Set command requires reboot (AT+RST)
Back to current mode +CWMODE:
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Join Ap
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Query AT+CWMODE?
1: Station 2:AP 3. Both
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AT+CWJAP
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0: Open 1: WEP 2: WPA_PSK 3: WPA2_PSK 4: WPA_WPA2_PSK =string value, AP name =signal strength
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Command
Description
Response
AT+CWQAP
Disconnect from AP Test AT+CWQAP=?
OK
OK
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Execute AT+CWQAP
AT+ CWSAP
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Set parameters under AP mode
Set command requires reboot
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Back to current AP parameters +CWSAP=,, ,
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Check IP of connected device
Execute AT+CWLIF
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Set AT +CWSAP=,, ,
AT+ CWLIF
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=string value, AP name =string value, max 64 ASCII chars =channel no. 0: Open 1: WEP 2: WPA_PSK 3: WPA2_PSK 4: WPA_WPA2_PSK
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Query AT+CWSAP?
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=IP address of connected device
ESP8266EX Beginner’s Guide
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4.4. TCP/IP Toolbox
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AT+CIPSTATUS
Get connection status
Execute AT+CIPSTATUS
Response
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Back to current connection mode and status +CIPSTATUS:,, ,,
=connected ID no. 0-4 =string value, conection type “TCP” or “UDP” =string value, IP address = port no. 0: Connect as client 1: Connect as server
=connected ID no. 0-4 =string value, conection type “TCP” or “UDP” =string value, IP address of remote server = port no. of remote server
ESP8266EX Beginner’s Guide
Description
Response
Set 1. Single Connection (+CIPMUX=0) AT +CIPSTART=,,
!!
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Syntax correct and connection successful, returns
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OK else returns
2.
Multiple Connections (+CIPMUX=0) AT +CIPSTART=,, ,
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Command
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If connection already exists, returns
Send Data Test AT+CIPSTART=?
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AT+CIPSEND
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ALREADY CONNECT
OK
Wrap return “>” after set command. Begins receive of serial data, when data length is met, starts transmission of data.
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Set 1. Single Connection (+CIPMUX=0) AT+CIPSEND=
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Multiple Connections (+CIPMUX=0) AT +CIPSEND=,
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If connection cannot be established or gets disconnected during send, returns
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ERROR If data is transmitted successfully, returns
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SEND OK
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= required ID no. of transmit connection =numeric value, size of transmit packet, maximum 2048 bytes
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Command
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Description
Response
Execute AT+CIPSEND
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Wrap return “>” after execute command. Enters pass-through mode, 20ms interval between each packet, maximum 2048 bytes per packet. When single packet containing “+++” is received, it returns to command mode.
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Command can only be used in pass-through mode and single connection mode.
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AT+CIPCLOSE
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!! ! Close TCP or UDP connection
OK
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Test AT+CIPCLOSE=?
Set Multiply connection mode AT+CIPCLOSE=
No errors, returns OK
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If connection is disconnected, returns LINK IS NOT
Execute Single connection mode AT+CIPCLOSE
No errors, returns OK
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If no such connection, returns ERROR
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Prints UNLINK when there is no connection
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= required ID no. of connection to close, when id=5, all connections will be closed. (id=5 has no effect in server mode)
ESP8266EX Beginner’s Guide
Espressif Systems
Command
Description
Response
AT+CIPSR
Get local IP address Test AT+CIPSR=?
: device’s current IP address (Station mode) OK
No effect under AP mode
+CIFSR:
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OK ERROR
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Start multiple connections
Query AT+CIPMUX?
+CIPMUX:
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OK
Set AT+CIPMUX=
OK
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If already connected, returns LINK IS BUILDED
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Execute AT+CIPSR
AT+CIPMUX
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0: Single Connection 1: Multiple Connection
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Mode can only be changed after all connections are disconnected. If server is started, reboot is required.
ESP8266EX Beginner’s Guide
Espressif Systems
Command
Description
AT+ CIPSERVER
Configure as server Set AT +CIPSERVER=[,< port>]
Response
Reference
OK
0: Server mode OFF 1: Server mode ON : port number, default value=333
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Server has to be restarted
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Server monitor will automatically be created when Server mode ON.
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When a client is connected to the server, it will take up one connection. Server can only be turned ON when AT +CIPMUX=1
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