Esp-01 Datasheet Page

You can find the official ESP-01 datasheet and documentation on the Espressif Systems website or other online resources, such as:

has a single blue LED connected to GPIO2, whereas the original ESP-01 often featured two LEDs (power and TX/RX). : Due to the internal pull-ups, the esp-01 datasheet

: Used to determine boot mode. Pull LOW to enter programming/flash mode; pull HIGH for normal operation. GPIO2 : Must be pulled HIGH at boot. ESP-01 vs. ESP-01S: Key Differences You can find the official ESP-01 datasheet and

Pro Tip: Keep a PDF of the ESP8266EX Technical Reference Manual on your desktop. You won't read all of it, but you will search for "Deep Sleep" and "GPIO" a thousand times. GPIO2 : Must be pulled HIGH at boot

Programmed via the Arduino IDE or NodeMCU (Lua) for simple IoT tasks like controlling relays or reading sensors.

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.