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The BMC21M041 is a RF transmitter module with frequency 433.92MHz that is composed of the Sub-1GHz OOK transmitter module, BM2102-94-1, and a breakout board.
The BMC21M041 has the same functions as the BM2102-94-1. The difference between them is that the BMC21M041 includes level shift circuit and a LDO IC HT7533 and breaks out the BM2102-94-1’s pins to match BMCOM connectors. The product supports I2C and UART interfaces. You can use the jumper to select it.
With the BMCOM, you can directly connect the product to BMduino development boards, such as BM53A367A.
You can use the product with other development boards, such as Arduino UNO, as well.
It is recommended to use with the RF receiver module, BMC23M041, to form a complete transmit and receive function.
| Pin | Name | Function |
|---|---|---|
| 1 | NC | - |
| 2 | SCL
RX |
I2C: clock line
UART: RX |
| 3 | SDA
TX |
I2C: data line
UART: TX |
| 4 | VDD | Power supply: 3.0V~5.5V |
| 5 | GND | Ground |
BMC21M041 provides the following 6 commands, please refer to "Arduino Library Description" document in the document label and the application note, "BCM-2102-X03 & BCM-2302-T01 Transparent Transmission Module Application", for details.
| Function | Command | Parameter | Function in the Arduino Library |
|---|---|---|---|
| Select the RF frequency band | 0x10 | 1 byte | void begin(uint8_t frequencyBand)
frequencyBand： 0x00(RF_315MHz)：315MHZ 0x01(RF_433_92MHz)：433MHz 0x02(RF_868MHz)：868MHZ 0x03(RF_915MHz)：915MHZ |
| Set the TX power | 0x12 | 1 byte | void setRFPower(uint8_t powervalue)
powervalue： 0x01(RF_0dBm_power)：0dBm 0x05(RF_5dBm_power)：5dBm 0x09(RF_10dBm_power)：10dBm 0x0D(RF_13dBm_power)：13dBm |
| Start the RF and send 1-byte data | 0x23 | 2 bytes | void beginTransmission(uint8_t data,uint8_t times)
data: data to be transmitted times: data transmission times times=0x00 Data will be transmitted continuously until endTransmission command executed |
| Stop the RF transmitter | 0x00 | 0 byte | void endTransmission(void) |
| Read the TX module statues | 0x81 | 0 byte | bool isRFbusy(void) |
| Read the module version | 0x90 | 0 byte | uint16_t getFWVer(void) |
| HS Code (reference) | 8517.79.00.00-6 |
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