This pin is also tied to the on-board LED.Ĭan be connected to reset to set the ESP8266 into deep sleep mode.Ī 10-bit ADC with a maximum voltage of 1V.ĮSP8266 enable pin. No supply: Can be used as a voltage supply input to the 3.3V regulator. The rest of the power, control, and I/O pins are broken out on the other side of the board. The SCL pin also serves as the clock (SCLK) for the ESP8266's SPI interface. If you need the extra I/O, instead of I 2C, the SDA and SCL pins can be used as GPIO 2 and 14 respectively. This pinout matches that of most of our I 2C-based breakout boards, so you can piggyback them right on top of the Thing. Pin LabelĬan either be used as ESP8266 GPIO2 or I 2C serial data (SDA).Ĭan either be used as ESP8266 GPIO14 or I 2C serial clock (SCL). This header includes four pins - all that should be required to connect an I 2C device up to the Thing. Whether you want to hook the Thing up to a motion sensor, light sensor, digital-to-analog converter, or OLED display, I 2C is often the protocol of choice. I 2C is a very popular communication protocol in the embedded world. Connects through a capacitor to RESET, and a buffer to the ESP8266's GPIO0.īy default, this pin does not supply the ESP8266 directly (a jumper on the back can change that). Performs auto-reset, and puts the ESP8266 into bootloader mode. If a pin is directly tied to an ESP8266 I/O, it'll be noted: Pin Label 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.įor a quick breakdown of the pins on this header, consult the table below. This six-pin header will be the main point of contact between the Thing and your development computer. The Thing's I/O headers can be broken down into three sections: Serial Programming Header This wishlist includes everything we use in this tutorial to program and use the Thing if you are ordering the board individually: Suggested Readingīefore continuing on with this tutorial, you may want to familiarize yourself with some of these topics if they're unfamiliar to you: To follow along with this tutorial, and get up-and-running with the Thing, you may need a few extra tools and materials.
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