HC12 Wireless Transceiver Module

HC-12 Wireless Transceiver Modules 433Mhz are wireless serial port communication modules, It is based on SI4463 RF chip, it has built in microcontroller, and can be configured using AT commands, Maximum output power is 100mW (20dBm) and receiver sensitivity differs from -117dBm to -100dBm, depending on transmission speed. It accepts 3.2V-5.5V and can be used with 3.3V and 5V UART voltage devices (3.3V safe).

HC-12 can be configured using AT command. The best way to do it, is to use USB-to-serial converter like CP2102. To put HC-12 into AT mode, pull SET pin to GND like this:

Most important commands:

1. AT – test command. It will return OK if AT interface is enabled
2. AT+Bxxxx – set serial port baud rate. For example, AT+B57600 set baud rate to 57600bps
3. AT+Cxxx – set radio channel. Channels start from 001 at 433,4MHz. Each next channel adds 400kHz. Channel 100 is 473,0MHz. AT+C002will set frequency to 433,8MHz. Two HC-12 devices that creates a wireless link have to operate on the same frequency
4. AT+FUx – set device mode: FU1, FU2, FU3 or FU4. Two HC-12 devices that creates a wireless link have to use the same mode
5. AT+Px – set device transmitting power. For example AT+P2 sets power to 2dBm (1.6mW)
   1. -1dBm (0.8mW)
   2. 2dBm (1.6mW)
   3. 5dBm (3.2mw)
   4. 8dBm (6.3mW)
   5. 11dBm (12mW)
   6. 14dBm (25mW)
   7. 17dBm (50mW)
   8. 20dBm (100mW)
6. AT+RX – retrieve all parameters: mode, channel, baud rate, power
7. AT+V – retrieve module version
8. AT+DEFAULT – reset module parameters to default settings

Features:

• Long-distance wireless transmission (1,000m in open space/baud rate 5,000bps in the air)
• Working frequency range (433.4-473.0MHz, up to 100 communication channels)
• Maximum 100mW (20dBm) transmitting power (8 gears of power can be set)
• Three working modes, adapting to different application situations
• Built-in MCU, performing communication with external device through serial port
• The number of bytes transmitted unlimited to one time

Specification:

• Working frequency: 433.4MHz to 473.0MHz
• Supply voltage: 3.2V to 5.5VDC
• Communication distance: 1,000m in the open space
• Serial baud rate: 1.2Kbps to 115.2Kbps（default 9.6Kbps）
• Receiving sensitivity: -117dBm to -100dBm
• Transmit power: -1dBm to 20dBm
• Interface protocol: UART/TTL
• Operating temperature: -40℃ to +85℃
• Dimensions: 27.8mm x 14.4mm x 4mm

Document:

• User manual

Package Include:

• 1 x HC12 Wireless Transceiver Module