AC/DC ESP32 WIFI Bluetooth 4 Channel Relay Module ESP32-WROOM Development Board
16,05 €
Writing port: GND, Rx, TX and 5V of esp32 are respectively connected to GND, TX, RX and 5V of external TTL serial port module. IO0 needs to be connected with GND during downloading, and then disconnect the connection between ioo and GND after downloading; Connection of;.
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