Product Description The ESP-01S is an upgraded, high-performance version of the classic ESP-01 WiFi module. Powered by the ESP8266 SoC, this tiny module is a self-contained SOC with an integrated TCP/IP protocol stack that can give any microcontroller access to your WiFi network. The "S" version features a redesigned antenna for better signal stability and removes the power and blue LEDs found on the older model to reduce power consumption and free up GPIO pins. It is the go-to solution for simple IoT projects like smart plugs, wireless sensors, and small web servers where a compact footprint is essential.
Key Highlights
Integrated TCP/IP Stack: Handles all WiFi and network protocols internally, allowing you to use simple AT commands via Serial to connect to the internet.
Compact IoT Solution: One of the smallest WiFi modules available, perfect for embedding into tight spaces or battery-powered wearables.
Upgraded Hardware: Unlike the standard ESP-01, the ESP-01S has improved RF performance and is more reliable for long-term wireless connections.
Versatile Modes: Supports three operational modes: Station (STA), Soft Access Point (AP), and Station + Soft AP.
Low Power Management: Includes a deep-sleep mode, making it suitable for battery-operated sensors that only wake up periodically to send data.
Technical Specifications
CPU: 80 MHz (can be overclocked to 160 MHz)
Frequency Range: 2.4GHz - 2.5GHz
Flash Memory: 1MB (8Mbit)
Output Power: +20dBm (in 802.11b mode)
Security: WPA/WPA2, WEP/TKIP/AES
Dimensions: 24.8mm x 14.3mm
Installation Tip from Robogears The ESP-01S is strictly a 3.3V device. Connecting it to the 5V pin of an Arduino will permanently damage the module. Furthermore, even the RX pin should be stepped down to 3.3V using a logic level converter or a resistor divider. Because the module can draw up to 200mA during WiFi transmission, the 3.3V output from a standard Arduino Uno may not be sufficient. We recommend using a dedicated ESP-01 Breadboard Adapter with an onboard 3.3V regulator to ensure stable power and easy wiring.
Note: The product images provided are for illustration purposes only. The actual product may vary slightly in terms of design, color, or component layout due to manufacturing updates, but technical specifications will remain as described.
