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ESP-01 ESP8266 Serial WIFI Wireless Transceiver Module

Specification	Details
Microcontroller	ESP8266EX
Flash Memory	1 MB
WiFi Protocol	802.11 b/g/n (2.4 GHz)
Operating Voltage	3.0V – 3.6V (3.3V Recommended)
Operating Current	Average ~80mA (Peak 200mA)
Interface	UART (Serial)
GPIO Pins	2 available (GPIO 0, GPIO 2)

Price

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₹ 118.64

(Tax included)

Barcode: 59301354

Product Description

The ESP-01 features a compact 2x4 pin header and an integrated PCB trace antenna. It is primarily used in two ways: as a WiFi adapter for other microcontrollers using Serial communication, or as a standalone controller for simple tasks like toggling a relay or reading a temperature sensor. Because of its 1MB flash memory, it can host small web servers or send data to cloud platforms like Blynk or ThingSpeak.

Key Features

Ultra-Compact Footprint: Measuring only 24.8mm x 14.3mm, it is ideal for space-constrained IoT devices and wearables.
Versatile Operating Modes: Supports Station (STA) mode to connect to a router, Access Point (AP) mode to create its own network, or a hybrid Dual Mode.
AT Command Set: Comes pre-flashed with firmware that allows you to control WiFi functions via standard Serial commands without complex coding.
Independent Programming: Compatible with the Arduino IDE and MicroPython, allowing you to bypass the AT commands and run custom firmware directly on the chip.
Low Power Capability: Supports sleep modes to conserve battery life in remote sensor applications.

Technical Details

Security: WPA/WPA2, WEP/TKIP/AES.
Stack: Integrated TCP/IP protocol stack.
Mounting: 2x4 (8-pin) 2.54mm male header.

Prototyping and Engineering Tips from Robogears

The 3.3V Strict Limit: The ESP-01 is not 5V tolerant. Powering it with 5V or connecting a 5V TX line from an Arduino directly to its RX pin will destroy the module. Always use a 3.3V regulator and a Logic Level Converter.
Current Spikes: During WiFi handshakes, the module can draw up to 200mA. The 3.3V pin on many Arduino boards cannot provide this consistently, leading to "brown-outs" or crashes. Use a dedicated 3.3V Power Supply Module for stability.
Breadboard Incompatibility: The 2x4 pin layout cannot be plugged directly into a breadboard because it will short the pins. Use Female-to-Male Jumper Wires or a specialized ESP-01 Breadboard Adapter.
Flashing Mode: To upload new firmware, GPIO 0 must be pulled to Ground (GND) while the module is powering up or resetting. Once the upload starts, you can release it.