![]() ![]() If you're intimidated by soldering there are 3D printed jigs available for different modules and devices. If you're new to soldering check out some soldering tutorial videos while you're at it. To solder you'll of course need a soldering iron, soldering tin and some flux. A PC power supply can be a source for 3.3V DC power.ĭevices with an USB upload port typically have a serial programmer built in, such as NodeMCU, D1 mini or M5Stack products. 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. NodeMCU You can also use a NodeMCU (or similar) as a reliable serial programmer 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. ![]()
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