Flashlight Switch, Wafer, and USB connector Applications on the Main Control Board of a Water Dispenser Pump
1. Flashlight Switch — Core of Human-Machine Interaction
Application Location: Front button area of the main control board, corresponding to the housing's “Pump/Stop,” “Quantity Dispense,” and “Light” function buttons.
Core Functions:
- Trigger Pumping: Instant press sends a conductive signal to the MCU, activating the water pump.
- Mode Switching: Short press cycles between dispensing modes (e.g., continuous flow/measured dispensing); long press turns off the light.
- Reset Feedback: Utilizes its instant reset property to achieve “press-and-go” functionality, preventing continuous pumping from accidental touches.
2. Wafer Connector (Pin Header / Board-to-Board Connector) — Internal Signal Bridge
Within the pump's main control board, the wafer connector primarily facilitates board-to-board connections or functional module interfaces.
Application Location: Board edges or corners, typically featuring white/black vertical surface-mount pin headers (e.g., 2P/3P/4P).
Core Functions:
Pump Connection: Connects to DC water pumps (motors) via 2P/3P Wafer connectors, transmitting power supply and control signals.
Battery Interface: Connects to the built-in lithium battery pack for power input (positive/negative terminals + detection line).
Light Board/Sensor Connection: If the water pump includes water level detection or ambient lighting, connects auxiliary boards via Wafer.
Model Selection: Primarily uses vertical surface-mount Wafer (e.g., PH2.0, XH2.54 pitch) with reverse-insertion protection to prevent incorrect polarity during module assembly.
3. Type-C Female Port —— Power and Data Interface
The USB connector serves as the water pump's “power supply station,” with some high-end models also supporting data transfer.
Location: Edge of the main control board, corresponding to the charging port on the housing
Core Functions:
Charging Management: Connects to a 5V USB power source to charge the built-in lithium battery, featuring overcharge/over-discharge protection via a charging management chip.
Firmware Updates (High-End Models): The Type-C port supports over-the-air MCU firmware upgrades to fix bugs or add new features.
Emergency Power Supply: Some models support direct connection to an external USB power source, eliminating the need for the battery.
Three-Component Collaborative Logic
Power Supply Phase: USB connector connects to power source → Charging management chip → Wafer connector → Lithium battery (energy storage).
Operational Phase: Lithium battery → Wafer connector → Main control board MCU → Flashlight switch (trigger command) → MCU control → Wafer connector → Water pump (water extraction).