The C-12 board is a wireless communication module operating at 433MHz with a range of up to 1000 meters. It uses the RF chip SI4463 and features a built-in microcontroller, which can be configured via AT commands.

Its main features include:

• Maximum output power: 100mW (20dBm)
• Sensitivity: from -117dBm to -100dBm, depending on transmission speed
• Operating voltage: 3.2V-5.5V, compatible with 3.3V and 5V UART devices

It operates in multiple modes:

• FU1: moderate power consumption
• FU2: extreme power consumption
• FU3: default general use
• FU4: long-distance mode

Configuration can be done via AT commands, and the best method is to use a USB to serial converter, such as the CP2102.

Technical specifications:

• Operating frequency: 433.4MHz to 473.0MHz
• Communication distance: 1,000m in open space
• Serial port speed: 1.2Kbps to 115.2Kbps (default 9.6Kbps)
• Receiver sensitivity: -117dBm to -100dBm
• Interface protocol: UART/TTL
• Operating temperature: -40℃ to +85℃
• Dimensions: 27.8mm x 14.4mm x 4mm