EspPlug
This board is intended to allow direct interfacing between ESP8266 modules and your computer via the USB serial port.
Serial parameters
Default module settings are 9600,N,8,1 for older firmware versions and
115200,N,8,1 for newer.
Jumpers
JP1 and JP2 on the bottom of the board control GP0 pin of ESP8266 module. At most one jumper should be soldered at any time. If connected to GND, ESP8266 module will enter firmware update mode every time it is plugged in. If GP0 is connected to DTR#, firmware update can be programmatically controlled; i.e. when DTR is high, firmware update will be enabled and when DTR is low, normal operation will proceed. Both these jumpers can be left disconnected if firmware upgrade functionality is not needed.
Commands
All commands have prefix AT and have to end with .
AT
Replies with OK.
Example
AT
OK
ATEstate
Turn character echoing off (0) or on (1).
Echo will be turned on by default and every time device is reset.
state:
0- Echo off1- Echo on
Example
ATE0
OK
AT+RST
Reset the module.
Example
AT+RST
OK
c_â–’â–’RSâ–’â–’FjSâ–’fJ[â–’â–’â–’
[Vendor:www.ai-thinker.com Version:0.9.2.4]
ready
AT+GMR
Shows the firmware version.
Example
AT+GMR
0018000902-AI03
OK
AT+CIUPDATE
Upgrades the firmware from cloud. Must be connected as client to access point with Internet access. Upgrade itself takes couple of minutes.
If firmware upgrade fails, at Electrodragon Blog you can see instructions for manual firmware update and a link to binaries needed for repair. To enter bootloader mode short between GP0 and GND will be needed (exposed on board's bottom as jumper link). Alternative firmwares and tools can be found on Electrodragon Documentation page.
Example
AT+CIUPDATE
+CIPUPDATE:1
+CIPUPDATE:2
+CIPUPDATE:3
+CIPUPDATE:4
OK
ets Jan 8 2013,rst cause:4, boot mode:(3,6)
wdt reset
load 0x40100000, len 212, room 16
tail 4
chksum 0x5e
load 0x3ffe8000, len 788, room 4
tail 0
chksum 0x1c
load 0x3ffe8314, len 72, room 8
tail 0
chksum 0x55
csum 0x55
jump to user1
rNâ–’
ready
AT+CIOBAUD=rate
Changes baud rate.
Example
AT+CIOBAUD=115200
BAUD->115200
OK
AT+CIOBAUD?
Shows current baud rate.
Result is given as:
+CIOBAUD:
rate
Example
AT+CIOBAUD?
+CIOBAUD:9600
OK
AT+CWMODE=mode
Changes the mode to one specified after the command.
mode:
1- Client2- Access point3- Both client and access point
Example
AT+CWMODE=1
OK
AT+CWMODE?
Read current mode.
Result is given as:
+CWMODE:
mode
mode:
1- Client2- Access point3- Both client and access point
Example
AT+CWMODE?
+CWMODE:1
OK
AT+CWLAP
Shows visible networks. Only valid in client modes (1 and 3).
Results are given as multiple lines each formatted as:
+CWLAP:(
security,"ssid",db,"mac",channel)
security:
0- No authentication1- No authentication2- WEP3- WPA4- WPA2
Example
AT+CWLAP
+CWLAP:(3,"DIRECT-roku-374-F9AA61",-57,"40:a7:37:e0:32:a5",1)
+CWLAP:(4,"HOME-38C0",-93,"f4:32:c8:d0:38:c0",1)
+CWLAP:(0,"xfinitywifi",-90,"26:32:c8:d0:38:c2",1)
+CWLAP:(1,"kaostation",-86,"c0:1d:19:de:23:21",1)
+CWLAP:(4,"HOME-ACD0",-89,"a4:32:c8:cc:ac:d0",1)
+CWLAP:(3,"Prashant",-91,"e0:e5:2a:aa:65:66",1)
+CWLAP:(3,"Polaris",-47,"fc:ee:7b:30:a9:e8",1)
+CWLAP:(3,"Gost",-48,"ec:ee:7b:30:a9:e9",1)
+CWLAP:(0,"xfinitywifi",-90,"e6:32:c8:cc:ac:d2",1)
+CWLAP:(3,"NETGEAR",-82,"a0:22:3f:9f:f2:2a",2)
+CWLAP:(3,"kao",-88,"bc:22:0b:2f:e8:08",6)
+CWLAP:(4,"kao3",-85,"bc:22:0b:2f:e8:09",6)
+CWLAP:(3,"HOME-13C8",-94,"b0:26:f3:ab:13:c8",6)
+CWLAP:(0,"xfinitywifi",-89,"b6:32:c8:25:16:dc",1)
+CWLAP:(3,"NETGEAR21",-54,"64:94:fc:3f:6f:0c",11)
+CWLAP:(4,"HOME-4982",-83,"60:1a:ca:22:49:80",11)
+CWLAP:(4,"HOME-7A7F",-90,"3c:35:40:d2:7a:7f",1)
+CWLAP:(4,"150104",-92,"ac:35:40:67:65:79",1)
OK
AT+CWJAP
Join the network giving the SSID and password. Both should be enclosed in quotes.
Example
AT+CWJAP="Polaris","SomePassword"
OK
AT+CWJAP?
Shows joined network.
Result is given as:
+CWJAP:"
ssid"
Example
AT+CWJAP?
+CWJAP:"Polaris"
OK
AT+CWQAP
Disconnects client from network.
Example
AT+CWQAP
OK
AT+CWSAP="ssid","password",channel,security
Set access point parameters. Valid only in AP modes (2 and 3).
channel is between 1 and 13.
security:
0- No authentication1- WEP3- WPA4WPA2
Example
AT+CWSAP="Test","Password",1,0
AT+CWSAP?
Returns current access point parameters.
Result is given as:
+CWSAP:"
ssid","password",channel,security
Example
AT+CWSAP?
+CWSAP:"ESP_9CB4F7","",1,0
OK
AT+CWLIF
Show access point clients.
Result is given as:
ip,mac
Example
AT+CWLIF
192.168.4.100,ac:f8:ae:51:89:07
OK
AT+CIFSR
Gives module IP address. First address given will be address in access point
mode (2 or 3) while second address will be one used in client mode (1 or
3).
Results are given as list of:
ip
Example
AT+CIFSR
192.168.4.1
192.168.100.105
OK
AT+CIFSR (newer)
Returns IP address assigned to module in following format:
+CIFSR:STAIP,"
ip" +CIFSR:STAMAC,"mac"
Example
AT+CIFSR
+CIFSR:STAIP,"192.168.200.126"
+CIFSR:STAMAC,"18:fe:34:9c:a4:aa"
OK
AT+CIPMUX=multi
Sets whether multiple connections are to be used.
multi:
0- Single connection only1- Multiple connections enabled
Example
AT+CIPMUX=1
OK
AT+CIPMUX?
Returns whether multiple connections are supported.
Results are given as:
+CIPMUX:
multi
multi:
0- Single connection only1- Multiple connections enabled
Example
AT+CIPMUX?
+CIPMUX:0
AT+CIPSTATUS
Returns the status of the connection.
Result for server connection is given as:
STATUS:
status
For client connection results are:
+CIPSTATUS:
id,protocol,"ip",port,remoteport,status
status:
0- Connected2- Listening4- Disconnected
Example
AT+CIPSTATUS
STATUS:4
+CIPSTATUS:0,"UDP","192.168.1.119",514,13566,0
+CIPSTATUS:2,"UDP","192.168.1.111",514,18867,0
OK
AT+CIPSTART="protocol",ip,port
Starts TCP or UDP connection in single connection mode.
protocol:
UDP- User Datagram ProtocolTCP- Transmission Control Protocol
Example (UDP)
AT+CIPSTART="UDP","192.168.1.119",514
0,CONNECT
OK
Example (TCP)
AT+CIPSTART="TCP","192.168.1.119",80
0,CONNECT
OK
AT+CIPSTART=id,"protocol",ip,port
Starts TCP or UDP connection in multiplexed mode.
protocol:
UDP- User Datagram ProtocolTCP- Transmission Control Protocol
Example
AT+CIPSTART=0,"UDP","192.168.1.119",514
0,CONNECT
OK
AT+CIPSEND=count
Sends number of characters over the connection.
Given characters can be inputed only after prompt (>) and command
automatically completes as soon as enough characters are received.
Example
AT+CIPSEND=26
> ABCDEFGHIJKLMNOPQRSTUVWXYZ
SEND OK
AT+CIPSEND=id,count
Sends number of characters over the multiplexed connection.
Given characters can be inputed only after prompt (>) and command
automatically completes as soon as enough characters are received.
Example
AT+CIPSEND=1,26
> ABCDEFGHIJKLMNOPQRSTUVWXYZ
SEND OK
AT+CIPCLOSE
Closes the connection.
Example
AT+CIPCLOSE
CLOSED
OK
AT+CIPCLOSE=id
Closes the connection in multiplexed mode.
Example
AT+CIPCLOSE=3
3,CLOSED
OK
AT+CIPSERVER=1,port
Starts TCP server on a given port. Multiplex mode must be turned on.
Example
AT+CIPSERVER=1,514
OK
AT+CIPSERVER=0
Closes TCP server connection. Module reset is needed after it.
Example
AT+CIPSERVER=0
we must restart
AT+CIPSTO=timeout
Sets server's connection timeout value. Value can only be set while server is listening.
Example
AT+CIPSTO=120
OK
AT+CIPSTO?
Returns currently set server timeout value.
Format is as follows:
+CIPSTO:
timeout
Example
AT+CIPSTO?
+CIPSTO:180
OK
id,state
This is an unsolicited output that gets received every time there is a change on server connection.
state
CONNECT- Connection establishedCLOSED- Connection closed
Example
0,CONNECT
+IPD
This is an unsolicited output that gets received every time server receives data.
Format:
+IPD,
id,count:data
Example
+IPD,0,26:ABCDEFGHIJKLMNOPQRSTUVWXYZ
OK
Schematics
Manufacturing
If you want to make this board your self, just grab the latest gerbers and send them over to OSH Park (or any other PCB manufacturer of your choice).
You can check my blog and other projects at www.jmedved.com.