ESp8266 ESP-12-E
The ESP-12E has a ESP8266 core processor, with a module of 4MB of flash memory. Also it has 22 pins and a on board printed antenna. It also has a built-in LED which is directly connected to the UART TX line. You can use the TX pin as GPIO1 to control the LED, but only if you don't use UART.
References
Reference | URL |
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ESP-12E | https://github.com/lvidarte/esp8266/wiki/ESP%E2%80%9012E |
ESP8266 Thing Development Board Hookup Guide | https://learn.sparkfun.com/tutorials/esp8266-thing-development-board-hookup-guide/all |