BMK52T016A is a module designed by Best Modules specifically for the micro:bit and Arduino (BMduino) ecosystems. Depending on the user’s development environment and the main board being used, it can be paired with the micro:bit IoT Expansion Board BMB81TM01A or the BMduino IoT Expansion Board BMB81TB01A to make sensor and module wiring more intuitive and integration significantly faster, greatly improving development efficiency.

The BMK52T016A is an upgraded version of the previous BMK52T016. It maintains full compatibility in terms of PCB layout and specifications, while adding foolproof pin alignment holes to improve assembly stability and usability—enabling seamless integration into existing product and development designs.

When a finger touches the copper area on the PCB, the capacitance changes. The system detects this change to simulate a button press.

The BMK52T016A features 16 touch keys. The board uses the I²C interface to read key states and illuminate the corresponding LED when touched.

Each key’s sensitivity can be fine-tuned based on application needs. For instance, if the module is covered with an acrylic panel, the detected capacitance decreases and sensitivity may need to be increased.

1. Operating Voltage: 2.5V ~ 5.5V
2. Operating Current: 4mA @ 5V; Standby Current: <30μA @ 5V (automatically enters standby after ~8 seconds of inactivity)
3. MCU: BS83B24C
4. 16-key capacitive touch + corresponding LED indicator
   - 4×4 matrix configuration
   - 55-level adjustable touch sensitivity (range: 10–64), configurable per key
5. On-board RESET button for resetting BMduino UNO
6. Communication Interface
   - I2C address: 0x70; speed ≤ 400kHz; logic level reference: 2.5V~5.5V
   - Connection methods: Direct plug into BMduino or via BMCOM (INT / SCL / SDA / VDD / GND)
7. Excellent stability and noise immunity
8. Dimensions: 67.0 × 54.94 × 16.0 mm
9. Net Weight: 15.2g
10. Package Includes: 1. BMK52T016A ×1 | 2. 5-pin header ×1

This product can be directly connected to an Arduino UNO or our custom-designed BMduino-UNO development board BM53A367A. Simply align the pin header on the back of the BMK52T016 with the corresponding socket on the Arduino UNO, BM53A367A, or any compatible board. No additional wiring is required.

Q1: How does the board enter standby mode?

A: The board automatically enters standby mode after approximately 8 seconds of inactivity.

Q2: How can the board be awakened from standby?

A: It can be awakened by touching any key or by receiving a valid command via the I²C interface.

Q3: Can the board detect touches through glass or acrylic covers?

A: Yes, touch detection works through materials such as glass or acrylic panels (recommended thickness ≤ 3mm). Sensitivity adjustments may be needed for optimal response.

1. MCU: Holtek BS83B24C, a touch-capable Flash MCU with datasheet, packaging, and other technical resources available.