ESP-01S ESP8266 WiFi Module

The ESP-01S ESP8266 is a compact, self-contained WiFi module with an integrated TCP/IP protocol stack, enabling any microcontroller to connect to a WiFi network. It can either host an application directly or offload all WiFi networking tasks from another processor.

Preloaded with AT command firmware, the ESP-01S is ready to connect with Arduino or other microcontrollers right out of the box—offering WiFi capabilities similar to a full WiFi shield at a fraction of the cost. It’s an extremely economical solution backed by a large and active developer community.

With built-in processing power and storage, the ESP-01S allows direct integration with sensors and peripheral devices via its GPIOs, minimizing development time and runtime overhead. Its highly integrated design requires minimal external components and is optimized for compact PCB layouts. The module also supports APSD for VoIP, Bluetooth coexistence interfaces, and features a self-calibrating RF for stable performance in any environment—without the need for external RF parts.