Some devices, such as NodeMCU, D1 mini or M5Stack products, have a USB upload port and the serial-to-USB adapter built in. You MUST make sure the data (RX and TX) and VCC pins are set for 3.3V. ![]() Some adapters can be switched between 3.3V and 5V for the data pins, but still provide 5V on the power pin which will irreparably destroy your device. RaspberryPi - only for advanced users.NodeMCU You can also use a NodeMCU (or similar) as a reliable serial-to-USB adapter if you disable the onboard ESP by bridging GND to the RST or EN pin, and connect TX and RX straight to another ESP82xx instead of crossed.CP2102 or PL2303 - works with certain devices, but using an external 3.3V supply might be necessary. ![]() Buy only the variant with a separate 3.3V regulator on PCB!
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