WIFI Single-channel Relay Module ESP8266 Power Supply ESP-12F Development Board
9,87 €
6X6mm button: ESP8266 reset button;. UART program download port: ESP8266's GND, RX, TX, 5V are respectively connected to the GND, TX, RX, 5V of the external TTL serial port module. IO0 must be connected to GND when downloading, and then disconnect the IO0 and GND after download connection;.
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