The Pinout
The Thing’s I/O headers can be broken down into three sections:
Serial Programming Header
This six-pin header will be the main point of contact between the Thing and your development
computer. The pinout of this header matches the extremely common “FTDI header.” That
means you can interface it with either a 3.3V FTDI Basic or a 3.3V I/O FTDI Cable to program
and debug the Thing.
For a quick breakdown of the pins on this header, consult the table below. If a pin is directly
tied to an ESP8266 I/O, it’ll be noted:
Pin
Label
ESP8266
I/O #
Notes
DTR
Performs auto-reset, and puts the ESP8266 into bootloader mode.
Connects through a capacitor to RESET, and a buffer to the ESP8266's
GPIO0.
TXO 7 ESP8266 UART1 data output.
RXI 8 ESP8266 UART1 data input.
3V3 By default, this pin does not supply the ESP8266 directly (a jumper on
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