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A cheap and low-power microcontroller family using Tensilica Xtensa LX6 CPU cores with integrated WiFi and dual-mode bluetooth.

The microcontroller uses one or two CPU cores and has a half megabyte big RAM size. The most commonly used embedded operating systems are Arduino and FreeRTOS.

It has a broad support of free development tools, particularly the GNU Toolchain.

It was put to the market by the Chinese company Espressif in 2016.