HC-12 433MHz Wireless Serial Port Module – SI4438 Chip

📶 HC-12 433MHz Wireless Serial Port Module – SI4438 📶

The HC-12 is a high-performance wireless transceiver module operating at 433MHz and powered by the SI4438 RF chip. It supports UART (serial TTL) communication and delivers up to 1000 meters range (open area with proper antenna). Ideal for wireless data transmission between microcontrollers such as Arduino, Raspberry Pi, and ESP32, making it perfect for IoT, remote control, and industrial communication projects.

✅ Specifications:

• Main Chip: Silicon Labs SI4438.
• Frequency Range: 433.4 – 473.0 MHz (programmable).
• Interface: UART (Serial TTL).
• Baud Rate: 1200 – 115200bps.
• Voltage Supply: 3.2V – 5.5V DC.
• Transmit Power: up to +20dBm (100mW).
• Receive Sensitivity: -117dBm @ 5000bps.
• Range: up to 1000 meters (open space with proper antenna).
• Operating Modes: Transparent Transmission / AT Command Mode.
• Current (TX): ~100mA.
• Standby Current: < 16mA.
• Module Size: 27 × 14 × 4 mm.
• Approximate Weight: 5 g.

🔹 Key Features:

✔ Long-range communication up to 1 km outdoors.

✔ Supports multiple baud rates (1200 – 115200bps).

✔ Configurable via AT commands (channels, baud rate, etc.).

✔ Compatible with Arduino, Raspberry Pi, and ESP32.

✔ Low power consumption relative to performance.

✔ Ideal for wireless control and data transmission applications.

📌 Common Applications:

• Wireless data transmission between microcontrollers.
• IoT communication systems.
• Remote control projects.
• Robotics and wireless vehicles.
• Wireless sensor networks.
• Cost-effective alternative to Zigbee or LoRa for mid-range communication.