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Home 4-Key and Wheel Capacitive Touch Sensing Shield BMK56T004A
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4-Key and Wheel Capacitive Touch Sensing Shield BMK56T004A

US$3.90
In stock
Quantity
100 pieces
Product ID
BMK56T004A

The BMK56T004A is a capacitive touch expansion board featuring 4 touch keys and 1 touch wheel, powered by the BS83B16C touch MCU. When a finger touches the wheel or any of the 4 keys, the corresponding LED lights up instantly. This board offers excellent stability and anti-interference performance, making it ideal for interactive applications such as smart home control panels.

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Features
  1. Operating Voltage: 2.5V ~ 5.5V
  2. Operating Current: 4mA @ 5V
  3. Standby Current: < 30μA @ 5V
  4. Automatically enters standby mode after about 8 seconds of inactivity
  5. Excellent stability and strong noise immunity
  6. Touch and Indicators
    - 1 × Touch Wheel (positions 1~8 mapped to LED1~LED8)
    - 4 × Touch Keys (KEY1~KEY4 mapped to LED9~LED12)
    - Adjustable sensitivity with 55 levels (range: 10~64), configurable individually for each position/key
  7. Communication Interface
    - I2C address: 0x74; speed ≤ 400kHz
    - Connection: Directly plugs into BMduino or via BMCOM
  8. Net Weight: 15.5g
  9. Dimensions: 67.0 × 54.94 × 16.0 mm
  10. Package Contents: 1. BMK56T004A ×1 | 2. 5-pin header ×1
Description

The BMK56T004A operates on capacitive touch principles: when a finger approaches the copper sensing area, the capacitance changes, which the MCU detects and uses to update the status and trigger the corresponding LED. The wheel supports 8 touch positions, and there are 4 separate touch keys, giving a total of 12 sensitivity channels that can be configured.

Supported I2C commands include:
- Reading touch status for both the wheel and keys (wheel outputs positions 1~8; keys output as bit values)
- Setting/reading the touch threshold for each channel (lower values increase sensitivity)
- Reading the firmware version

For power management, the board defaults to standby detection mode on power-up. It switches to active mode upon detecting touch, and if no touch is detected for about 8 seconds, it automatically returns to standby mode—balancing quick response with low power consumption.

Pinout

This board can be used directly with an Arduino UNO or our BMduino-UNO development board. Simply align the pin header on the back of the BMK56T004A with the Arduino UNO or BM53A367A sockets—no additional wiring needed.

Pin Name BM53A367A Pin Function
INT D2 Output pin
No touch: High level
Touch detected: Low level
SCL D19/SCL I2C clock line
SDA D18/A4 I2C data line
IOREF IOREF Power input (use 3.3V with BM53A367A)
RESET RESET Reset BM53A367A
GND GND Ground

Alternatively, you can connect the BMK56T004A to the BM53A367A via the BMCOM interface.

Pin Pin Name Function
1 GND Ground
2 VDD Power supply: 2.5V ~ 5.5V
3 SDA I2C data line
4 SCL I2C clock line
5 INT Output pin
No touch: High level
Touch detected: Low level
Technical Q&A

Q1: How does it enter sleep mode?

A: The board automatically enters sleep mode after about 8 seconds of no activity.

Q2: How can it be woken from sleep?

A: It wakes automatically when a touch is detected.

Q3: Can it detect touches through glass or acrylic?

A: Yes, as long as the cover material is no thicker than 3mm, and sensitivity is adjusted accordingly for optimal touch response.

Resources
  1. MCU: Holtek BS83B16C, enhanced touch-type Flash MCU, with datasheet, package dimensions, and related resources.
Arduino library V1.03 (454.91 kB)
Keil Driver V1.0.1 (1.32 MB)
PCB layout (249.63 kB)
Schematic (274.68 kB)
User's guide V1.00 (1.43 MB)
Arduino library guide V1.03 (786.46 kB)
More Information
HS Code (reference) 8504.50.90.00-5
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