The HC-12 firmware provides four distinct operation modes, often referred to as "Function Modes" or FU modes. These modes are selectable using AT commands (e.g., AT+FU1 , AT+FU3 ) to balance power consumption, transmission speed, and range. The Four Modes:
But here’s the secret most hobbyists miss:
Your HC-12 should have these test points or pins: hc-12 firmware
Because the HC-12 uses a standard STM8S003F3P6 microcontroller, it is possible to bypass the manufacturer's firmware and upload custom code. GitHubhttps://github.com
: A comprehensive list of official firmware-supported commands, including the version check ( AT+V ), can be found on Scribd's HC-12 AT Command Guide . The HC-12 firmware provides four distinct operation modes,
AT+DEFAULT : Resets to factory settings (FU3, Channel 1, 9600 baud). 4. Firmware Incompatibilities and Clones
Pull the SET pin low (connect to GND) while the module is already powered. GitHubhttps://github
. It acts as an interface between the user's UART (Serial) data and the
An interesting deep dive into the firmware of the HC-12 wireless serial module can be found in the article by itooktheredpill .