Compact WiFi Module for IoT | Generated by AI
The ESP-01S is a compact WiFi module based on the ESP8266 microcontroller chip from Espressif Systems. It’s an upgraded version of the original ESP-01, designed primarily for IoT (Internet of Things) applications where you need to add wireless connectivity to other microcontrollers like Arduino or Raspberry Pi.
Key Features
- WiFi Capabilities: Supports 802.11 b/g/n standards, acting as a standalone WiFi access point, station, or both. It includes a built-in TCP/IP protocol stack for easy network integration.
- Processor and Memory: Runs on a Tensilica L106 32-bit RISC CPU at 80 MHz (overclockable to 160 MHz). Comes with 1MB (or sometimes 4MB in variants) of SPI flash memory for code and data storage.
- I/O Pins: 8-pin layout (VCC, GND, CH_PD, RST, TX, RX, GPIO0, GPIO2) for serial communication (UART) and basic GPIO control, like toggling LEDs or relays.
- Power and Size: Operates on 3.3V (not 5V-tolerant), draws low power (around 80mA during transmission), and measures about 24.75 x 14.5 mm—making it ideal for small projects.
- Improvements Over ESP-01: Better PCB layout for improved WiFi signal strength, more flash memory (1MB vs. 512KB), and a blue status LED on GPIO2 instead of TX.
Common Uses
- Connecting sensors or devices to the internet for remote monitoring/control.
- Programming via Arduino IDE (with ESP8266 board support) or AT commands over serial.
- Prototyping smart home gadgets, like WiFi-enabled switches or weather stations.
To get started, you’ll need a USB-to-serial adapter (like FTDI) for flashing firmware, as it doesn’t have a built-in USB port. It’s inexpensive (under $5) and widely available, but handle it carefully to avoid damaging the pins.
How to use an ESP-01S module Getting Started With the ESP8266 ESP-01 ESP-01S Introduction ESP-01S / ESP01S ESP8266 Module