433MHz HC-12 Wireless Serial Port Module (1000m Range)

The 433MHz HC-12 Wireless Serial Port Module is a compact, low-power RF transceiver that provides transparent UART-to-wireless communication for microcontrollers and embedded systems. With easy TTL UART interface and AT-command configuration, the HC-12 supports long-range, stable links (up to 1000 m line-of-sight with the proper antenna), making it ideal for telemetry, remote control, IoT sensor networks, and home automation. Works with Arduino, ESP boards, Raspberry Pi (via TTL), and other microcontrollers.

Key SEO keywords: 433MHz wireless module, HC-12 module, long-range RF, TTL UART transceiver, wireless serial module, IoT RF module, 1000m range.

Short features

• Compact, low-power 433MHz RF transceiver.

• Transparent TTL UART (serial) interface — plug & play.

• Long range: up to 1000 m line-of-sight (with suitable antenna).

• Configurable via AT commands (baud rate, channel, power, mode).

• Wide operating voltage for direct microcontroller connection.

• Low standby/operating current — suitable for battery systems.

• Reliable data link for telemetry, remote control, and sensor networks.

Typical specifications

• Model: HC-12 (433MHz)

• Operating frequency: 433 MHz band (typical modules use 433.4 MHz).

• Range: Up to 1000 m line-of-sight (open area, depends on antenna & environment).

• Interface: TTL UART (RX/TX), +Vcc, GND, EN/SET pins for mode/config.

• Supply voltage: Typical 3.2–5.5 V (check module variant/datasheet).

• Default baud rate: Common default 9600 bps (configurable via AT commands).

• Data rate: Configurable — commonly supports multiple baud rates for serial data.

• RF power / sensitivity: Typical modules are designed for long-range performance (actual Tx power and Rx sensitivity vary by manufacturer/version).

• Antenna: External antenna connector or onboard antenna pad (depends on version).

• Protocols: Transparent serial (no special protocol required); supports AT commands for settings.

• Operating temperature: Typical commercial range (e.g., -20°C to +70°C) — verify specific part.

• Dimensions: Compact PCB module (dimensions vary by supplier).

• Mounting: PCB headers (2.54mm pitch) — solder or use female headers for plug-in.

⚠️ Note: exact electrical values (Tx power dBm, Rx sensitivity dBm, precise voltage limits, and temperature range) vary between HC-12 suppliers and clones. Verify the supplier datasheet before designing production hardware.

Applications

• Remote sensor telemetry and data logging (agriculture, environment).

• Wireless serial link between microcontrollers (Arduino ↔ Arduino).

• Remote controls for robots, drones, and RC vehicles.

• Home automation & smart metering.

• Industrial monitoring and alarms.

• Wireless configuration and debugging of embedded devices.

• Mesh-ish/simple point-to-point or point-to-multipoint links (software-managed).

Package includes

• 1 × 433MHz HC-12 Wireless Serial Port Module (PCB)

• 1 × Antenna (if variant includes antenna) — confirm supplier listing.

• 1 × 4/6-pin male header (sometimes shipped un-soldered)

• 1 × Quick start sheet / basic wiring & AT commands (may be included depending on vendor)