HC-12 SI4463 433MHz Wireless Serial Module

Connect the module's TX/RX pins to a USB-to-serial adapter or microcontroller UART. Power it with 3.3V-5V, open a serial terminal at the default 9600 baud, and send AT commands like AT+Cxxx to set the channel (001-100) or AT+BAUDx to change the baud rate. Ensure to set both communicating modules to identical parameters for successful wireless data transfer. The onboard MCU handles all radio configuration automatically.

These UART transmission modes balance power consumption and responsiveness. FU1 offers normal operation (~3.6mA). FU2 is a special low-power sleep mode (~80μA) waking on serial data. FU3 and FU4 are transparent transmission modes (~16mA) with different packet handling. Select the mode via AT command (AT+FUx) based on your application's need for battery life versus instant data throughput, as changing modes affects current draw and latency.

Yes, for extended range, use a 433MHz antenna with an IPEX/u.FL connector plugged into the ANT1 socket. Alternatively, solder a spring or wire antenna directly to the ANT2 pads. Ensure the antenna is tuned to the module's operating frequency (e.g., 433MHz) for optimal impedance matching and radiation efficiency. An external antenna with proper gain can significantly improve line-of-sight distance beyond the built-in PCB trace option.

The HC-12 supports data rates from 1200 bps to 115200 bps, configurable via AT+BAUD. The reliable throughput depends on RF environment; lower baud rates like 9600 are more robust for long distances. The SI4463 chip has 64-byte TX/RX FIFOs, but the module's firmware may handle larger serial buffers. For best performance, structure your data into packets under 64 bytes and implement software flow control or acknowledgments in your host microcontroller code.

Connect VCC to 5V (or 3.3V if your module variant supports it), GND to GND, the HC-12's TX pin to an Arduino RX pin (e.g., Digital 2), and the HC-12's RX pin to an Arduino TX pin (e.g., Digital 3). Use a SoftwareSerial library on these pins for communication. Remember to logic level shift if your Arduino is 5V and the module is 3.3V logic. Then, use standard Serial.write() and Serial.read() functions in your sketch to send and receive data wirelessly.