About this item

📶 ESP-01S Wi-Fi Module

📡 Compact Wireless Connectivity

The ESP-01S is a compact Wi-Fi module based on the ESP8266EX chip. Designed for IoT and wireless control, it enables microcontrollers to connect to Wi-Fi networks or create their own access points. Ideal for home automation, wireless data transmission, and smart devices.

📘 Technical Details

⚙️ Features

• 📶 Wi-Fi Standard: IEEE 802.11 b/g/n
• 💾 Flash Memory: 1MB
• 📡 Frequency Range: 2.4 – 2.5 GHz
• 🔌 Operating Voltage: 3.0 – 3.6V
• ⚡ Current (TX): ~170 mA (max)
• 📏 Size: 24.8mm x 14.3mm
• 🔁 Modes: STA / AP / STA+AP
• 🔗 Interface: UART (3.3V TTL logic)
• 🧠 SoC: ESP8266EX – 32-bit Tensilica L106

🛠️ Applications

• 🏠 Home Automation (smart switches, sensors)
• 🧠 IoT Projects (data logging, remote monitoring)
• 🧪 Wireless Prototyping with Arduino, STM32, ESP32
• 📶 Wi-Fi-enabled appliances and toys
• 🌐 Network-controlled LED lighting or relays

⚠️ Notes

• 🔧 Requires 3.3V UART for serial communication
• 🚫 Do not power with 5V directly — use regulator
• ⚠️ GPIO0 must be grounded for flashing firmware

✨ Key Advantages

• 📦 Extremely compact form factor
• 🔄 Easily reprogrammable with Arduino IDE / AT commands
• 📡 Reliable Wi-Fi performance for embedded use
• 🧩 Compatible with FTDI adapters and USB-to-Serial tools

🔗 Useful Links

• 📄 ESP8266 Datasheet (PDF)
• 💻 Arduino ESP8266 Core GitHub