ESP8266
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The ESP8266 is a low-cost Wi-Fi microcontroller, with built-in TCP/IP networking software, and microcontroller capability, produced by Espressif Systems in Shanghai, China. Wikipedia
CPU: Tensilica Diamond Standard 106Micro (aka. L106) @ 80 MHz (default) or 160 MHz
Input: 16 GPIO pins
Manufacturer: Espressif Systems
Memory: 32 KiB instruction, 80 KiB user data
Power: 3.3 V DC
Successor: ESP32