3Pcs Geekcreit® HC-12 433MHz SI4438 Wireless Serial Module Wireless Transceiver Transmission Serial Communication Data Board Remote 1000M COD

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Note: HC-11 cannot communicate with the HC-12, they work independently, used in pairs.



1. Supply voltage: 3.2V~5.5V. (If the module you want to work long hours in the emission state, it is recommended that when the supply voltage exceeds 4.5V threaded a 1N4007 diode to prevent module built-in LDO heated)

3. Default idle current: 16MA (In different working modes operating current is different)

5. Operating frequency range: 433.4-473.0MHz, up to 100 channels of communication

7. Module support software upgrade

 9. Four transparent transmission modes, adapt to different application occasions.

10. Built-in MCU, free of programming, only need to communicate with external devices through the serial port

11. Unlimited number of bytes sent in a single time (FU1 / FU3 mode)

12. The module supports one-to-one, one-to-many, many-to-one, many-to-many connection transparent transmission

Parameter name	Reference	Parameter name	Reference
Model	HC-12	Module size	27.4 x13.2 x 4mm
Frequency Range	433.4 ~ 473.0MHZ	Working frequency	433.4-473.0MHz
Communication Interface	UART 3.3V / 5V TTL level	Antenna interface	Spring antenna / antenna socket
Operating Voltage	3.2-5.5V	Idle current	16mA
Communication level	3.3V / 5V level	Working humidity	10% ~ 90%
Transmit power	20dBm (MAX)	Operating temperature	-25 ° C ~ + 75 ° C
Reference distance	1000m	storage temperature	-40 ° C ~ + 85 ° C

Module parameters, AT command set

 



The second mode of entry - power, 5th pin "SET" again first set low on power.

The second way is fixed in serial format 9600, N, 1 into the AT.

Instructions:

1. AT

Example: Send module commands "AT", the module returns "OK".

2. AT + Bxxxx

Example: Set the module serial port baud rate is 19200bps, please send module command "AT + B19200", the module returns

 

Change the wireless communication channel, selectable from 001 to 127 (more than 100 radio channels after the communication distance not guaranteed). The default value is 001 radio channels, operating frequency is 433.4MHz. Step channel is 400KHz, the operating frequency of the channel 100 is 473.0 MHz.

Example:

After exiting the command mode, the module in the first 21 channels, operating frequency is 441.4 MHz.

 



Example: Send module commands "AT + FU1", the module returns "AT + OK".

5. AT + Px

The default setting is 8, maximum transmit power, communication distances. Transmit power level is set to 1, the minimum transmission power. In general, the transmission power of each drop 6dB, communication distance will be reduced by half.


 Four transparent transmission modes of the module:

 FU1: (send AT + FU1 in more power-saving mode)

FU2: (send AT + FU2 in power saving mode) 

FU3: (send AT + FU3 in full speed mode (factory default))

FU4: (Send AT + FU4 in longer distance mode) 

Number	AT command (x means parameter)	Response	Effect
1	AT	OK	Check whether the module is normal
2	AT+Bxxxx	OK+Bxxxx	Change the serial port baud rate
3	AT+Cxxxx	OKsetname	Change the channel of wireless communication
4	AT+FUx	OK+FUx	Change the module serial port transparent transmission mode
5	AT+Px	OK+Px	Set the module's transmit power level
6	AT+Ry	OK + (parameter specified by y)	Get the individual parameters of the module
7	AT+RX	OK + various parameters	Get all parameters of the module
9	AT+V	www.hc01.com HC-12_V2.6	Query module firmware version information
10	AT+SLEEP	OK+SLEEP	Enter sleep mode
11	AT+DEFAULT	OK+SLEEP	Reset

Package included: