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

Example

Notes

Pin

Mode

AT+PINMODE=<pin>,<mode>

AT+PINMODE=5,o

Mode:

INPUT_PULLUP

Digital

Write

AT+PINWRITE=<pin>,<state>

AT+PINWRITE=5,h

State:

Digital

Read

AT+PINREAD=<pin>

AT+PINREAD=0

LOW or HIGH.

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.

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