When using an external 3.3V supply, ensure the ground (GND) of both are connected together, this ensures a common ground. The ESP requires at least 150mA, many 3.3V serial programmers cannot supply this much current as many serial programming tasks do not require a large amount of power. Many serial programmers do not have a voltage regulator on board like the pictured ones. ![]() 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. ![]()
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