This is an expansion board for the ESP-01S WiFi module, compatible with the breadboard.
You can directly plug it into the breadboard, and plug the ESP-01S module according to the arrow silk-screen on the board.
The expansion board pulls the ESP-01S module pins out onto the breadboard, allowing easy experiments through the breadboard plug.
After power-on, the module is in BOOT flash mode, and the AT command test can be directly performed.
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