One of the images shows the difference in the pin mappings between the two versions. If working with examples, you may need to reassign some pins depending on which version you are working with. There is also a newer R2 version which uses a different pin-out on some of the I/O. The board is the original R1 compatible version. This board was originally produced by WeMos. It will also work with some Uno shields that have compatible I/O pin-outs. It provides a way to work with the ESP8266 in a familiar setup and does not require a breadboard in order to make interconnections since it has the typical on-board female headers. The ESP8266 D1 R1 WiFi board utilizes the ESP8266 WiFi enabled processor, and puts it onto an Arduino Uno board footprint. Check out the newer R2 version of the board.
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