📡 HC-12 SI4463 433MHz Wireless Serial Module
The HC-12 is a half-duplex wireless serial transceiver built around the SI4463 radio chip and an STM8S003F3P6 microcontroller, giving any board with a UART a simple long-range data link. You set channel, baud rate and power with AT commands over the same serial line, then data flows transparently from one module to another — no protocol coding, no pairing procedure.
✨ Key Features
- Transparent UART bridge — bytes in one module, out the other
• AT-command configuration over serial
- 100 channels in the 433.4–473.0 MHz band, 400 kHz steps
- Eight selectable transmit power levels for range versus current draw
• Sleep mode for low-power battery designs
• Antenna pad for a spring or wire antenna
🔬 Specifications
- Core: SI4463 RF + STM8S003F3P6 MCU
- Frequency: 433.4–473.0 MHz, 100 channels
- Supply voltage: 3.2–5.5 V DC
- Serial: TTL UART, default 9600 8N1, 1200–115200 bps supported
- RF output: up to 20 dBm across 8 levels
- Header: VCC, GND, RXD, TXD, SET
💡 Perfect For
- Arduino / ESP32 / STM32 telemetry between remote sensors and a base station
- RC and remote-control projects that need more range than Wi-Fi or NRF24 gives
- Data logging across a building, garden or farm
• Replacing cables in fixed installations
📦 Notes
An antenna is not included — a 433 MHz spring or an ~8.2 cm wire works well. Leave the SET pin floating for normal transparent operation, and pull it low only when sending AT commands.
