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

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.

SKU: AB1859 Categories: Bluetooth and NRF Modules, IoT and Wireless Tags: Bluetooth and NRF Modules, IoT and Wireless

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Description

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)

🔌

Pin Connections

1 Table

Pin Connections Table 1

Board	Sensor Pin	Connection
HC-12	VCC/GND/TX/RX	3.3-5V / GND / board RX pin / board TX pin

📟

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

7 Examples • C/C++ | Boards: Arduino Uno, Arduino Nano, Arduino Mega, ESP32, ESP8266, STM32, Raspberry Pi Pico

Wrap

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

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

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

433MHz HC-12 Wireless Serial Port Module (1000m Range) - ESP32

433MHz HC-12 Wireless Serial Port Module (1000m Range) - ESP8266

433MHz HC-12 Wireless Serial Port Module (1000m Range) - STM32

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

📄 File: 433mhz_hc-12_wireless_serial_port_module_(1000m_range)_-_arduino_uno.inoArduino Uno

668 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// RX=2, TX=3 on Arduino Uno (module TX -> board RX; module RX needs a voltage divider from 5V boards since the module is 3.3V logic)

6#include <SoftwareSerial.h>

7SoftwareSerial LINK_SERIAL(2, 3);

9void setup() {

10 Serial.begin(115200);

11 LINK_SERIAL.begin(38400); // 38400 is HC-05's default AT-mode/factory baud - many pre-paired modules run at 9600, check yours

12}

14void loop() {

15 if (LINK_SERIAL.available()) Serial.write(LINK_SERIAL.read()); // data from the paired Bluetooth device -> USB serial

16 if (Serial.available()) LINK_SERIAL.write(Serial.read()); // USB serial -> Bluetooth device

17}

📄 File: 433mhz_hc-12_wireless_serial_port_module_(1000m_range)_-_arduino_nano.inoArduino Nano

669 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// RX=2, TX=3 on Arduino Nano (module TX -> board RX; module RX needs a voltage divider from 5V boards since the module is 3.3V logic)

6#include <SoftwareSerial.h>

7SoftwareSerial LINK_SERIAL(2, 3);

9void setup() {

10 Serial.begin(115200);

11 LINK_SERIAL.begin(38400); // 38400 is HC-05's default AT-mode/factory baud - many pre-paired modules run at 9600, check yours

12}

14void loop() {

15 if (LINK_SERIAL.available()) Serial.write(LINK_SERIAL.read()); // data from the paired Bluetooth device -> USB serial

16 if (Serial.available()) LINK_SERIAL.write(Serial.read()); // USB serial -> Bluetooth device

17}

📄 File: 433mhz_hc-12_wireless_serial_port_module_(1000m_range)_-_arduino_mega.inoArduino Mega

637 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// RX=19, TX=18 on Arduino Mega (module TX -> board RX; module RX needs a voltage divider from 5V boards since the module is 3.3V logic)

6#define LINK_SERIAL Serial1

8void setup() {

9 Serial.begin(115200);

10 LINK_SERIAL.begin(38400); // 38400 is HC-05's default AT-mode/factory baud - many pre-paired modules run at 9600, check yours

11}

13void loop() {

14 if (LINK_SERIAL.available()) Serial.write(LINK_SERIAL.read()); // data from the paired Bluetooth device -> USB serial

15 if (Serial.available()) LINK_SERIAL.write(Serial.read()); // USB serial -> Bluetooth device

16}

📄 File: 433mhz_hc-12_wireless_serial_port_module_(1000m_range)_-_esp32.inoESP32

630 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// RX=16, TX=17 on ESP32 (module TX -> board RX; module RX needs a voltage divider from 5V boards since the module is 3.3V logic)

6#define LINK_SERIAL Serial1

8void setup() {

9 Serial.begin(115200);

10 LINK_SERIAL.begin(38400); // 38400 is HC-05's default AT-mode/factory baud - many pre-paired modules run at 9600, check yours

11}

13void loop() {

14 if (LINK_SERIAL.available()) Serial.write(LINK_SERIAL.read()); // data from the paired Bluetooth device -> USB serial

15 if (Serial.available()) LINK_SERIAL.write(Serial.read()); // USB serial -> Bluetooth device

16}

📄 File: 433mhz_hc-12_wireless_serial_port_module_(1000m_range)_-_esp8266.inoESP8266

668 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// RX=D7, TX=D8 on ESP8266 (module TX -> board RX; module RX needs a voltage divider from 5V boards since the module is 3.3V logic)

6#include <SoftwareSerial.h>

7SoftwareSerial LINK_SERIAL(D7, D8);

9void setup() {

10 Serial.begin(115200);

11 LINK_SERIAL.begin(38400); // 38400 is HC-05's default AT-mode/factory baud - many pre-paired modules run at 9600, check yours

12}

14void loop() {

15 if (LINK_SERIAL.available()) Serial.write(LINK_SERIAL.read()); // data from the paired Bluetooth device -> USB serial

16 if (Serial.available()) LINK_SERIAL.write(Serial.read()); // USB serial -> Bluetooth device

17}

📄 File: 433mhz_hc-12_wireless_serial_port_module_(1000m_range)_-_stm32.inoSTM32

633 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// RX=PA10, TX=PA9 on STM32 (module TX -> board RX; module RX needs a voltage divider from 5V boards since the module is 3.3V logic)

6#define LINK_SERIAL Serial1

8void setup() {

9 Serial.begin(115200);

10 LINK_SERIAL.begin(38400); // 38400 is HC-05's default AT-mode/factory baud - many pre-paired modules run at 9600, check yours

11}

13void loop() {

14 if (LINK_SERIAL.available()) Serial.write(LINK_SERIAL.read()); // data from the paired Bluetooth device -> USB serial

15 if (Serial.available()) LINK_SERIAL.write(Serial.read()); // USB serial -> Bluetooth device

16}

📄 File: 433mhz_hc-12_wireless_serial_port_module_(1000m_range)_-_raspberry_pi_pico.inoRaspberry Pi Pico

640 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// RX=1, TX=0 on Raspberry Pi Pico (module TX -> board RX; module RX needs a voltage divider from 5V boards since the module is 3.3V logic)

6#define LINK_SERIAL Serial1

8void setup() {

9 Serial.begin(115200);

10 LINK_SERIAL.begin(38400); // 38400 is HC-05's default AT-mode/factory baud - many pre-paired modules run at 9600, check yours

11}

13void loop() {

14 if (LINK_SERIAL.available()) Serial.write(LINK_SERIAL.read()); // data from the paired Bluetooth device -> USB serial

15 if (Serial.available()) LINK_SERIAL.write(Serial.read()); // USB serial -> Bluetooth device

16}

Project Notes:

Long-range UART wireless bridge module.

Specification

WeightWeight	8 g
Dimensions	3 × 2 × 1 cm
Frequency	433.4–473.0 MHz
Communication Range	Up to 1000 meters (open space)
Serial Interface	TTL UART
Baud Rate	1200–115200 bps
Operating Voltage	3.2–5.5V
Transmission Power	20dBm
Operating Temperature	-40°C to +85°C
Modes	FU1–FU4 (Point-to-Point, Multi-Point)
Antenna	External or PCB Trace
Material	PCB / Electronic Components