8 Channel ESP8266 WIFI Relay Module DC 5V/DC 7-28V ESP-12F Development Board Kit
15,97 €
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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