ESP8266 WIFI 1/2/4CH 30ARelay Module ESP-12F Development Board DC7-28V/80V 5V
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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