There is also a 470 μF capacitor connected between the positive and negative rails of the breadboard. GND/Negative to negative rail of breadboard The ESP draws more current than the 3.3V pin can provide. WARNING: Again, do not use the 3.3V pin on the Arduino UNO to power your ESP module. Here's a nice, large diagram that hasn't been compressed if you need it: WIRING DIAGRAM. Start with the diagram and refer to the description below if something is not clear.
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