ESP8266 is the smallest system board. ESP12E and 12F chips are available, and it is compact in size.
There is no USB-TTL on the board, you need to use the USB-TTL downloader. First connect IO0 to ground, then connect the TXD of the board to the RXD of USB-TTL, and the RXD of the board to the TXD of USB-TTL. Connect the power supply and you can download the program. Just leave IO0 ungrounded when running the program.
Sample front and back
(Not taken yet...)
Actual picture front and back
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