HC-12 433MHz wireless serial communication module configuration


Dziku  writes:

HC-12 are cheap 433MHz wireless serial port communication modules with a range up to 1800m in open space. Each costs about $5 when bought from China, and 2 of them can create wireless UART link that can be used, for example, to transfer telemetry data from UAV. Or drive IoT device. Or connect sensors. Or whatever else one can think of.
It is based on SI4463 RF chip, has build in microcontroller, can be configured using AT commands and allows to use external antenna. Working frequency is divided into 100 channels starting from 433,4MHz up to 473,0MHz with 400kHz channel separation. Maximum output power is 100mW (20dBm) and receiver sensitivity differs from -117dBm to -100dBm, depending on transmission speed. It accepts 3,2V-5,5V power supply and can be used with 3.3V and 5V UART voltage devices (3.3V safe).

More details at Quad Me Up site.

Join the Conversation


  1. You will need a ham radio license to use these in the USA, from Channel 1 (433.4 MHz) up to around channel 40 (449.4 MHz). Also, you will have to restrict the baud rate to 56k or below on those channels to comply with the FCC rules. Above 450 MHz, it’s illegal to use.

Leave a comment

Your email address will not be published. Required fields are marked *

Notify me of followup comments via e-mail. You can also subscribe without commenting.