Hardware Assembly - sparkfun ESP8266 Hook-Up Manual

As an example exercise, here are a series of commands you might type to
connect a WiFi access point and get your IP address:
> AT+CWOMDE=1
OK
> AT+CWJAP="MySSID","MyPSK"
WIFI CONNECTED
WIFI GOT IP
OK
> AT+CIFSR
+CIFSR:STAIP,"192.168.0.101"
+CIFSR:STAMAC,"18:fe:34:9d:b7:d9"
Custom GPIO Commands
We've taken Espressif's AT command firmware and added a few additional
functions which give you control over the ESP8266's unused digital GPIO.
In all, there are 9 GPIO to be digitally controlled: 0, 2, 4, 5, 12, 13, 14, 15,
and 16 (XPD).
The custom commands allow you to set a pin to input or output (or input
with pullup resistor), digitally write high or low, or read the pin's state:
Function Command
Pin AT+PINMODE=<pin>,<mode>
Mode
Digital AT+PINWRITE=<pin>,<state>
Write
Digital AT+PINREAD=<pin>
Read

Hardware Assembly

Before you can use the ESP8266 Shield, you'll need to solder a few
headers in so it can interface with your Arduino.
Stackable headers are always a good option for shields, especially if you
plan on stacking more shields or plugging in jumper wires.
You can also opt for the more form-factor-friendly male headers, if stacking
isn't as important to you.
Example Notes
AT+PINMODE=5,o Mode:
• : OUTPUT
o
• : INPUT
i
• :
p
INPUT_PULLUP
AT+PINWRITE=5,h State:
• : HIGH
h
• : LOW
l
AT+PINREAD=0 Response:
LOW or HIGH.
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