This is an expansion board for the ESP-01S WiFi module. The shield comes with a USB to Serial port chip CH340G. Installed the driver, push the shield’s button to Flash Boot, and plug into computer’s USB port. You can use Serial debugging tool to test the AT command. Push the shield’s button to Download, and plug into computer’s USB port, ESP-01 module is at download mode. You can download the firmware to ESP-01 module using firmware software.
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