HC-12 433MHz Long Range Wireless Serial Module (1000m)
- Product Code:
- 2018-2-679
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HC-12 433MHz Wireless Serial Port Module - 1000m Range
The HC-12 is a long-range UART TTL serial communication module operating in the 433MHz ISM band. Providing wireless data transmission up to 1000 meters in open areas, this compact module stands out with adjustable power levels, low power consumption, and easy configuration via AT commands. Compatible with Arduino, ESP32, ESP8266, STM32, Raspberry Pi, and all UART-enabled microcontrollers, the HC-12 is a reliable solution for projects such as sensor networks, robotic systems, remote control, telemetry, and drone communication.
Technical Specifications
| Feature | Value |
|---|---|
| Frequency | 433 MHz ISM Band |
| Communication Interface | UART TTL (at 3.3V level) |
| Range | 1000m (open area) |
| Data Rate | 500 bps – 115200 bps |
| Output Power | Up to 100mW (20dBm) |
| Operating Voltage | 3.2V – 5.5V |
| Current Consumption | Normal < 16mA |
| Number of Channels | 100 channels |
| Antenna | Internal / external antenna support |
| AT Command Support | Yes |
| Operating Modes | FU1, FU2, FU3, FU4 |
Pin Connections
| Pin | Description |
|---|---|
| VCC | 3.2V – 5.5V power input |
| GND | Ground connection |
| RXD | Data input to module (UART RX) |
| TXD | Data output from module (UART TX) |
| SET | Connect to GND to enter AT command mode; leave floating in normal operation |
Example Microcontroller Connections
Connection with ESP32
| HC-12 Pin | ESP32 Pin |
|---|---|
| VCC | 5V or 3.3V |
| GND | GND |
| TXD | GPIO 16 (ESP32 RX) |
| RXD | GPIO 17 (ESP32 TX) |
| SET | Can be left floating or GPIO4 |
Note: Since the ESP32 operates at 3.3V UART level, no additional level converter is required.
Connection with Arduino UNO
| HC-12 Pin | Arduino UNO Pin |
|---|---|
| VCC | 5V |
| GND | GND |
| TXD | D2 (SoftwareSerial RX) |
| RXD | D3 (SoftwareSerial TX) |
| SET | Can be left floating |
Note: Since the hardware serial port of Arduino UNO conflicts with USB, it is recommended to use the SoftwareSerial library.
Package Contents
Package includes: 1 x HC-12 433MHz Wireless Serial Port Module.
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