The BMK52M134 is a capacitive touch module with four keys arranged in a 2x2 array. Up to four BMK52M134 modules can be cascaded, and you can read or control the keys through the I2C interface.
| Select | Quantity | Discount | Unit price |
| 1-9 | - | US$2.80 | |
| 10+ | 5% | US$2.66 |
When a finger touches the copper trace area on the PCB representing the switch area, the capacitance of this area will change. The BMK52M134 determines the output status of the INT pin by detecting this change.
You can cascade up to four BMK52M134 modules simultaneously, and when cascading, you only need to connect one of them to the development board.
The development board reads the keys’ statuses via I2C interface and lights up the corresponding LED. Sensitivity of the touch keys can be individually configured based on your application. For instance, when you place an acrylic panel on the BMK52M134, the capacitance of the affected copper foil area decreases. Consequently, the keys may require higher sensitivity.
There is a BMCOM on the product to directly connect to BMduino development boards, such as BM53A367A. You can use the product with other development boards, such as Arduino UNO, as well.
Rear of the BMK52M134
| Pin | Pin name | Function |
|---|---|---|
| 1 | INT | Sensed a touch: output low level
Non-sensed: output high level |
| 2 | SCL | I2C: clock line |
| 3 | SDA | I2C: data line |
| 4 | VDD | Power supply: 2.5V~5.5V |
| 5 | GND | Ground |
| 6 | GND | Ground |
| 7 | VDD | Positive power |
| 8 | ST_O | Cascade status output |
| 9 | TRX | Cascade single-bus communication pin |
| 10 | VDD | Positive power |
| 11 | GND | Ground |
| 12 | ST_I | Cascade status input |
| 13 | TRX | Cascade single-bus communication pin |
Question 1: Can touch keys senses even if I put glass or acrylic on it?
Answer: Sure, you can put glass or acrylic with the maximum thickness of 3mm on the board, and it is recommended to configure sensitivity of touch keys to achieve the best touch feedback.
| HS Code (reference) | 8504.50.90.00-5 |
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