ESP8266 ESP-01S WiFi Module
Compact ESP8266-based WiFi dev board with 1MB flash, 2 GPIO pins, and 802.11 b/g/n. Runs Arduino, MicroPython, ESPHome, and Tasmota firmware for smart home and IoT projects.
$2.90
Tap any value to browse matching devices
Specifications
Components
Espressif ESP8266EX single-core Tensilica L106 at 80/160MHz with integrated WiFi 802.11 b/g/n and 1MB flash.
Bus Interfaces
Overview
The ESP8266 ESP-01S is a compact WiFi module built around the Espressif ESP8266EX SoC, featuring a Tensilica L106 32-bit MCU running at 80/160MHz with integrated 802.11 b/g/n WiFi. With 1MB flash and 2 available GPIO pins, the ESP-01S is designed for space-constrained IoT applications where WiFi connectivity is the primary requirement.
Despite its tiny 24.8x14.3mm form factor with just an 8-pin 2x4 header, the ESP-01S is a fully programmable microcontroller that can run custom firmware. It supports Arduino IDE, MicroPython, ESPHome, and Tasmota, making it a popular choice for smart home relay control, WiFi-connected sensors, and MQTT-based IoT nodes.
The module is commonly paired with a relay adapter board (often included) for controlling mains-powered devices via WiFi. With ESPHome or Tasmota firmware, it integrates directly with Home Assistant for local smart home control without cloud dependencies.
Key Features
- ESP8266EX SoC: 32-bit Tensilica L106 @ 80/160MHz
- WiFi: 802.11 b/g/n, WPA/WPA2, SoftAP + Station mode
- Flash: 1MB (8Mbit)
- GPIO: 2 usable pins (GPIO0, GPIO2)
- UART: TX/RX for programming and communication
- Power: 3.0–3.6V, ~170mA peak during transmission
Pinout
| Pin | Function |
|---|---|
| VCC | 3.3V power supply |
| GND | Ground |
| TX | UART Transmit |
| RX | UART Receive |
| GPIO0 | General purpose I/O / Boot mode |
| GPIO2 | General purpose I/O |
| CH_PD | Chip Enable (tie to VCC) |
| RST | Reset (active low) |
Use Cases
5Smart Home
Home automation devices for controlling lighting, climate, security, and appliances.
IoT
Internet of Things applications including connected sensors, actuators, and smart devices that communicate over WiFi, BLE, LoRa, or other wireless protocols.
Smart Switch
Build WiFi or BLE controlled relay boards for switching lights, appliances, and HVAC.
home-automation
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Where to Buy
Explore more of the directory — popular use cases, firmware, and specs to browse next.
