ESP8266 ESP-01S WiFi Transceiver Module | 3.3V IoT for Arduino
ESP8266 ESP-01S WiFi Transceiver Module | 3.3V IoT for Arduino
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Short Product Description
Short Product Description
The ESP8266 ESP-01S WiFi Transceiver Module is an ultra-compact, industrial-grade wireless networking solution designed to bring seamless internet connectivity to your Arduino and IoT projects. Featuring an upgraded PCB antenna for an impressive 400-meter range and supporting AP, STA, and AP+STA modes, this module makes smart home development highly cost-effective. Available in-stock at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po, it is the perfect instant-pickup component for STEM educators, makers, and engineers building the next generation of connected devices.
Key Features
Key Features
- Upgraded PCB Antenna: Optimized trace design delivers a stable wireless range of up to 400 meters in open-air environments.
- Versatile Network Modes: Fully supports Station (STA), SoftAP (AP), and SoftAP+Station coexistence modes for flexible network topologies.
- Simple AT Commands: Pre-flashed with standard AT firmware, allowing for rapid integration and programming via simple serial commands.
- Ultra-Compact Footprint: Measuring just 24mm x 9mm, it easily fits into miniature smart home devices and custom IoT enclosures.
- Powerful LWIP Protocol: Built-in TCP/IP protocol stack handles complex networking tasks, freeing up processing power on your main microcontroller.
Full Product Description
Full Product Description
Seamless IoT Connectivity with ESP8266
This ESP-01S module provides a complete and self-contained Wi-Fi networking solution, allowing you to easily offload all Wi-Fi networking functions from another application processor. Equipped with a powerful internal LWIP protocol and simple AT command support, it dramatically reduces development time for IoT applications. Whether you are building a smart weather station, remote relay switch, or wireless sensor network, this module acts as a reliable bridge between your microcontroller and the cloud.
Upgraded ESP-01S PCB Antenna Design
The ESP-01S is a direct optimization of the classic ESP-01, featuring a refined PCB antenna layout that significantly enhances signal strength and stability. When properly matched and operated in an open environment, this upgraded antenna design can achieve a wireless transmission distance of up to 400 meters. Its ultra-compact 24x9mm footprint ensures it can be easily integrated into space-constrained enclosures without sacrificing network performance.
Pro Tip from Our Technicians
Always power this module with a dedicated 3.3V power supply capable of delivering at least 250mA during peak transmission. Our Sham Shui Po DIY specialists strongly warn against connecting the VCC pin directly to the 5V pin of an Arduino UNO, as this will instantly destroy the ESP8266 chip. Additionally, you must use a logic level converter for the TX/RX serial lines if you are interfacing it with a 5V microcontroller.
Technical Specifications
Technical Specifications
- Microcontroller Chip: ESP8266EX
- Module Version: ESP-01S (Optimized Antenna Version)
- Operating Voltage: 3.0V - 3.6V DC (3.3V Recommended)
- Working Current: 80mA (Average)
- Wireless Network Modes: Station / SoftAP / SoftAP + Station
- Communication Interface: Serial UART (AT Commands)
- Maximum Range: Approx. 400 meters (Open space, after matching)
- Operating Temperature: -40°C to +125°C
- Dimensions: 24mm x 9mm
Delivery Options
Delivery Options
- Local delivery within Hong Kong and in-store pickup.
- Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
- Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
- Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
- In-store pickup details (location and time) will be confirmed by email or phone message.
- Delivery times are estimates and may be affected by weather or unforeseen circumstances.
FAQ Section
FAQ Section
- Can I power this module directly from an Arduino 5V pin?No, this module operates strictly on 3.0V to 3.6V (3.3V recommended), and applying 5V to the VCC pin will permanently damage the ESP8266 chip.
- What is the difference between the ESP-01 and the ESP-01S?The ESP-01S is an upgraded version that features an optimized PCB antenna layout for better signal range, and it includes internal pull-up resistors that make booting and flashing more stable.
- How do I program or send commands to this WiFi module?You can communicate with the module by sending standard AT commands via a Serial UART connection using a USB-to-TTL adapter or a programmed microcontroller.
- Can I pick up this module today at your Hong Kong store?Yes, this ESP-01S WiFi module is regularly stocked at our Sun Cheong Computer Co. Ltd. physical store in Sham Shui Po for immediate purchase and pickup.
- What is the maximum wireless range of this module?Under optimal conditions with a clear line of sight and proper matching, the optimized PCB antenna can achieve a transmission distance of approximately 400 meters.
Target Users / Applications
Target Users / Applications
- Smart home DIYers building custom Wi-Fi enabled relay switches for home automation.
- STEM educators teaching basic IoT networking and AT command structures using Arduino.
- Electronics engineers prototyping low-cost wireless sensor nodes for environmental monitoring.
