ActuatorsPump
Mini Submersible Water Pump
Small 5V submersible pump for irrigation and fountain projects.
Wiring & code for
Mini Water Pump practical reference
A low-voltage submersible pump commonly used in automated plant-watering systems, mini fountains, and liquid-cooling loops.
Key specifications
- Operating voltage: 3V - 6V DC (5V typical)
- Current draw: ~130-220 mA at 5V — more than a GPIO pin can source directly
- Flow rate: ~80-120 L/hr at zero head height, model-dependent
- Max lift height: ~40cm-1m typical for this size of pump
- Duty notes: Submersible, brushed DC motor — not rated to run dry; running without water in the reservoir will burn out the motor
Pinout and connection notes
Drive through an NPN transistor or logic-level MOSFET (with a flyback diode across the motor) or a relay module — the pump's current draw exceeds what any microcontroller GPIO pin is rated to supply.
- +: Positive lead — through a transistor/MOSFET or relay driver, never straight from a GPIO pin
- -: Negative lead — common ground with the driver circuit
Integration checklist
- Confirm the exact part number and breakout-board revision.
- Verify supply voltage, current demand, logic levels, and signal direction against the datasheet.
- Check controller pin assignments and bus address or interface mode against the example code.
- Power up with external loads disconnected, then test signals before full integration.
- If readings or communication fail, check power and ground first, then pin mapping, interface settings, and library initialization.
Troubleshooting and reproducibility
Record the board used, wiring, library/version, supply arrangement, and measured behavior. Use the selected board-specific wiring example as the source of truth. Never assume visually similar modules share identical voltage tolerance or pin order.