HC-12 433MHz Wireless Serial Module – Up to 1km Transparent Data Transmission

The HC-12 Wireless Serial Module is a compact, easy-to-use 433MHz RF communication module designed for reliable long-range wireless data transmission up to 1 kilometer. Built around the powerful SI4438 chip, it enables seamless serial communication between microcontrollers, Arduino boards, Raspberry Pi, and other embedded systems — all without the clutter of wires.

Whether you're building a remote sensor network, a DIY home automation project, a robotics system, or a wireless telemetry application, the HC-12 delivers stable, transparent data transfer you can depend on.

Key Features

Frequency Band: 433.4 – 473.0 MHz (100 selectable channels)
Transmission Distance: Up to 1,000 meters (open air)
Core Chip: Silicon Labs SI4438 for high sensitivity and low power consumption
Interface: Standard UART serial (TTL level) — plug-and-play with Arduino, STM32, Raspberry Pi, and more
Baud Rate: Configurable from 1,200 to 115,200 bps
Operating Voltage: 3.2V – 5.5V DC
Transparent Data Transmission: Pass-through serial data with no additional protocol overhead
AT Command Configuration: Easily set frequency, baud rate, power, and sleep modes via AT commands
Compact Form Factor: Ideal for embedding in enclosures and custom PCBs
Low Power Modes: Multiple sleep modes for battery-powered applications

What's in the Box

1 × HC-12 433MHz Wireless Serial Module

Ideal Applications

Arduino & Raspberry Pi wireless projects
Home automation and smart device networking
Remote sensor data collection
Wireless robotics control
IoT (Internet of Things) prototyping
Drone and RC communication links

Compatible With

Arduino Uno, Arduino Mega, ESP8266, ESP32, STM32, Raspberry Pi, and virtually any microcontroller with a UART serial interface.

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Frequently Asked Questions

Q: What is the HC-12 433MHz Wireless Serial Module and what is it used for?

A: The HC-12 is a 433MHz wireless UART serial communication module based on the SI4438 chip. It is widely used in DIY electronics, Arduino projects, IoT prototyping, home automation, robotics, and any application that requires long-range wireless serial data transmission of up to 1 kilometer in open air.

Q: How do I configure and use the HC-12 module?

A: The HC-12 module connects via a standard UART (TTL serial) interface to your microcontroller. Configuration is done through simple AT commands — just pull the SET pin LOW and send commands via serial to adjust frequency channel, baud rate, transmit power, and operating mode. No special libraries are required for basic transparent data transmission.

Q: Is the HC-12 module compatible with Arduino and Raspberry Pi?

A: Yes! The HC-12 operates at 3.2V–5.5V and uses standard TTL serial, making it fully compatible with Arduino Uno, Arduino Mega, Raspberry Pi, ESP8266, ESP32, STM32, and most other microcontrollers or single-board computers with a UART interface.

Q: What is the maximum range of the HC-12 wireless module?

A: In open-air conditions with the default settings, the HC-12 can achieve wireless transmission distances of up to 1,000 meters (approximately 1 km). Range may vary depending on obstacles, interference, antenna quality, and power settings.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.