Esp-01 Datasheet |verified|

Also, note the . The datasheet shows peaks near 300mA. The little voltage regulators on many Arduino boards cannot supply this. You need a dedicated 3.3V regulator (like the AMS1117) to power this module.

includes 12K pull-up resistors on the RST, GPIO0, and CH_PD pins. This means you don't need external resistors to keep the module stable during power-up. : The esp-01 datasheet

It’s a finicky, low-pin-count, voltage-sensitive pain in the neck. But when you finally get that "Hello World" printed over Wi-Fi from a board the size of a postage stamp, you’ll understand why this little blue module became a legend. Also, note the