1 2 4 Channels 5V Relay Module ESP-12F Development Board for Arduino Raspberry
ab 6,23 €
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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