CJMCU-0401 4-Channel Capacitive Touch Keypad Module

The CJMCU-0401 is a 4-channel capacitive touch module that replaces traditional mechanical buttons with contactless capacitive sensing. It provides four touch inputs, four direct digital output pins, and four LED indicators that light up when a corresponding pad is touched. Because the panel medium can be completely insulating—glass, ceramics, plastic, and similar materials—the module can be mounted behind a sealed front panel, which makes this capacitive touch suitable for appliances, control panels, and equipment where dust, moisture, or repeated mechanical wear would damage a conventional switch.

The touch sensor module operates from 2V to 5.5V, draws a maximum of 11.5µA and only about 4µA in low-power mode at 3V with no load, and includes a built-in de-jitter circuit that suppresses false triggering from external noise. An automatic calibration function re-calibrates the system approximately every 4.0 seconds when no key is touched, keeping sensitivity stable over time. This touch switch module is a practical choice for household devices, control systems, and DIY electronics projects that need a reliable, low-power module.

1. Household appliances and white goods that require sealed, wipe-clean control panels.
2. Industrial and commercial control systems replacing mechanical pushbuttons.
3. Front panels behind glass, ceramic, or plastic where a touch keypad is preferred.
4. DIY electronics and Arduino projects that need a 4-channel touch module.
5. Access control, kiosk, and vending interfaces using a capacitive keypad.
6. Equipment exposed to dust or moisture where a switch module avoids mechanical wear.

1. Model: CJMCU-0401.
2. Product type: 4-channel capacitive touch keypad module.
3. Touch inputs: 4 capacitive sensing pads.
4. Outputs: 4 direct digital output pins.
5. Indicators: 4 LED indicators (one per channel; a power LED is also reported by some distributors).
6. Operating voltage: 2V to 5.5V DC.
7. Maximum current consumption: 11.5µA.
8. Low-power mode current: approximately 4µA at 3V with no load.
9. Automatic calibration: re-calibration cycle of about 4.0 seconds when no key is touched.
10. Noise suppression: built-in de-jitter circuit.
11. Panel medium: glass, ceramics, plastics, and other insulating materials.
12. Dimensions (L × W × H): approximately 44 × 27 × 3 mm (per distributor listings; not stated on the source page).