DC 5V 7- 80V 30A ESP8266 WIFI 1/2 Channel Relay Module ESP-12F Development Board
ab 9,75 €
Programming port: ESP8266's GND, RX, TX, 5V are respectively connected to the GND, TX, RX, 5V of the external TTL serial port module. IO0 needs to be connected to GND when downloading, and then disconnect the connection between IO0 and GND after the download is complete;.
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