HC-12 Transceiver Wireless Module 433MHz 1km Range

DESCRIPTION

HC-12 wireless serial port communication module is a new-generation multichannel embedded wireless data transmission module. It's wireless working frequency band is 433.4-473.0MHz. Multiple channels can be set with steps of 400 KHz, and there are in total 100 channels available to use. The maximum transmitting power of module is 100mW (20dBm), the receiving sensitivity is -117dBm at baud rate of 5,000bps in the air, and the communication distance is 1,000m in open space.

The module is encapsulated with castellated holes, which you can mount easily with surface mount soldering. There is a PCB antenna connector ANT1 on the module which you can connect external antenna of 433MHz. There is also an antenna connection ANT2 in the module where you can solder the spring antenna. You can only use either one antenna at any time.

There is a STM8 MCU inside the module that handles the communication to the SI4438 chipset. Data transmits in transparent mode for receiving and sending. The module adopts multiple serial port transparent transmission modes, and you can select them with AT command according to your requirements. The average working current of three modes FU1, FU2 and FU3 in idle state is 80μa, 3.6mA an 16mA respectively, and the maximum working current is 100mA (in transmitting state).

PIN DEFINITION

1. VCC: Power input 3.2V to 5.5V
2. GND: Ground
3. RXD: UART TTL Receive
4. TXD: UART TTL Transmit
5. SET: Parameter setting control pin, active low
6. ANT: Antenna pin 433MHz
7. GND: Ground
8. GND: Ground
9. NC: No connect

TRANSPARENT TRANSMISSION MODE

FU1

• Mode: Power Saving Mode 1
• AT Command: AT+FU1
• Idle Current: ~3.6mA
• Baud Rate: 1200bps - 115200bps
• Air Baud Rate: 25000bps
• Transmission Delay: ~15-25ms

FU2

• Mode: Power Saving Mode 2
• AT Command: AT+FU2
• Idle Current: ~80uA
• Baud Rate: 1200bps, 2400bps, 4800bps
• Air Baud Rate: 25000bps
• Transmission Delay: 500ms

FU3

• Mode: Full Speed Mode
• AT Command: AT+FU3
• Idle Current: ~16mA
• Baud Rate: 1200bps - 115200bps
• Air Baud Rate: 5000bps - 236000bps
• Transmission Delay: ~4-80ms

FU4

• Mode: Long Range Mode
• AT Command: AT+FU4
• Idle Current: ~16mA
• Baud Rate: 1200bps
• Air Baud Rate: 500bps
• Transmission Delay: 1000ms

Note: In FU2 mode, it is only suitable for transmitting small amount of data (each data packet within 20 bytes), and the sending time should not be too short (more than 2 seconds), otherwise it will cause data loss. In FU4 mode, it is only suitable for transmitting small amount of data (each data packet within 60 bytes), and the sending time should not be too short (more than 2 seconds), otherwise it will cause data loss.

AT COMMANDS

[command], [response], [description]

1. [AT], [OK], [Check if module is active]
2. [AT+Bxxxx], [OK+Bxxxx], [Change serial port baud rate]
3. [AT+Cxxxx], [OKsetname], [Change channel for wireless communication]
4. [AT+FUx], [OK+FUx], [Change transparent transmission mode]
5. [AT+Px], [OK+Px], [Set transmit power of module]
6. [AT+Ry], [OK+(parameter specified by y)], [Get single parameter of the module]
7. [AT+Rx], [OK+(various parameters)], [Get all parameters of the module]
8. [AT+V], [www.hc01.com HC-12_V2.6], [Check firmware version information]
9. [AT+SLEEP], [OK+SLEEP], [Enter sleep mode]
10. [AT+DEFAULT], [OK+SLEEP], [Reset the module]

FEATURES

• Long-distance wireless transmission (1,000m in open space/baud rate 5,000bps in the air)
• Working frequency range (433.4-473.0MHz, up to 100 communication channels)
• Maximum 100mW (20dBm) transmitting power (8 gears of power can be set)
• Three working modes, adapting to different application situations
• Built-in MCU, performing communication with external device through serial port
• The number of bytes transmitted unlimited to one time

TECHNICAL DETAILS

• Operating Voltage: 3.2V to 5.5V
• Chipset: SI4438
• Communication Protocol: UART 3.3 - 5V TTL
• Communication Distance: 1,000m in the open space (500bps)
• Operation Frequency: 433.4MHz to 473.0MHz
• Serial Baud Rate: 1200bps to 115200bps (default 9600bps, 8N1)
• Receiving Sensitivity: -117dBm to -100dBm
• Transmit Power: -1dBm to 20dBm
• Transparent Transmission Mode: FU1, FU2, FU3, FU4
• Transmission Mode: Half Duplex
• Antenna Interface: Spring Antenna
• Sleep Current: 22μA
• Operating Temperature: -25°C to +75°C
• Operating Humidity: 10% to 90%
• Storage Temperature: -40°C to +85°C

SHIPPING LIST

• 1x HC-12 Transceiver Wireless Module 433MHz 1km Range
• 1x Spring Antenna