The BMK22M131 is an LED button module with a built-in red LED that is designed using the Holtek 8-bit MCU, HT66F2040. The product can be cascaded up to 16 modules at the same time and configured functions or read status of buttons via the I2C interface.
| Select | Quantity | Discount | Unit price |
| 1-9 | - | US$2.20 | |
| 10+ | 5% | US$2.09 |
The BMK22M131 provides two operation mode: button control mode and instruction control mode.
Button control mode: the LED lights up when the button is pressed and turns off when the button is released.
Instruction control mode: the LED brightness is configurable from 0 to 255, and the LED can be displayed as a breathing light.
Additionally, the product can recognize short press and long press by configuring the long press duration. You can also define functions for both short and long presses. For instance, set the button to enter sleep mode upon detecting a long press, and adjust the power of the water atomization module upon sensing a short press.
And then, configure the long press duration to 2000ms. When the button is held for 1500ms, it will be recognized as a short press, triggering an adjustment in the water atomization module's power.
There is the BMCOM on the module. With the BMCOM, you can directly connect the product to BMduino development boards, such as BM53A367A directly. You can use it with other development boards, such as Arduino UNO, as well.
The on-board SCOM_I and SCOM_O interfaces are used to cascade numerous modules (up to 16 modules).
| Pin | Pin name | Function |
|---|---|---|
| 1 | INT | interrupt pin |
| 2 | SCL | I2C: clock line |
| 3 | SDA | I2C: data line |
| 4 | VDD | Power supply: 3.0V~5.5V |
| 5 | GND | Ground |
| 6 | GND | Ground |
| 7 | VDD | Positive power |
| 8 | ST_O | Cascade status output pin |
| 9 | TRX | Cascade single bus communication pin |
| 10 | VDD | Positive power |
| 11 | GND | Ground |
| 12 | ST_I | Cascade status input pin |
| 13 | TRX | Cascade single bus communication pin |
| HS Code (reference) | 8517.79.00.00-6 |
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