ADAFRUIT 2821 Datasheet & Stock

The Feather HUZZAH ESP8266 is a compact, lightweight WiFi development board measuring approximately 2.0 inches by 0.9 inches by 0.28 inches (51mm x 23mm x 8mm). It features an ESP8266 microcontroller running at 80 MHz with 3.3V logic, 4MB of flash memory, and built-in WiFi 802.11 b/g/n capability. The board includes a CP2104 USB-Serial converter supporting high-speed uploads at 921600 baud, with automatic reset functionality for easy programming. It offers 9 GPIO pins that can be used as I2C or SPI, plus 1 analog input (max 1.0V). Power can be supplied via micro USB or a 3.7V LiPo battery, which is internally rechargeable with a built-in charger and status indicator. The board also features a power/enable pin, reset button, and pin indicators with onboard status LEDs (red for general use and blue for bootloading/debugging). Four mounting holes facilitate easy integration into projects. The lightweight design weighs approximately 9.7 grams.

View 2821Datasheet [pdf]