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The ESP8266 is a low-cost Wi-Fi chip with full TCP/IP stack and MCU (Micro Controller Unit) capability produced by Shanghai-based Chinese manufacturer, Espressif Systems.
Features 32-bit RISC CPU: Tensilica Xtensa LX106 running at 80 MHz 64 KiB of instruction RAM, 96 KiB of data RAM External QSPI flash - 512 KiB to 4 MiB IEEE 802.11 b/g/n Wi-Fi 16 GPIO pins SPI, I²C, I²S interfaces with DMA (sharing pins with GPIO) UART on dedicated pins, plus a transmit-only UART can be enabled on GPIO2 1 10-bit ADC
The chip first came to the attention of western makers in August 2014 with the ESP-01 module, made by a third-party manufacturer, AI-Thinker.
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