A Mini Water Pump is a small DC motor-driven pump used for liquid transfer and circulation in DIY electronics and IoT projects like automatic plant watering systems, cooling systems, and fountain projects.
 
Key Specifications
Operating Voltage: 3V – 12V DC (commonly 5V or 6V)
Current: ~100mA–300mA (depending on load)
Flow Rate: 80–120 L/h (varies by model)
Lift Height: ~0.3–1.5 meters
Type: Submersible (works when placed in water)
Tube Diameter: ~5–8 mm (inner)
Material: ABS plastic body, metal motor inside
 
Features
Lightweight, compact design
Works with low-voltage power sources (like NodeMCU projects)
Quiet operation
Used for continuous water circulation
 
Wiring & Control
Connect pump terminals to power supply (DC):
Red = Positive (+)
Black = Negative (-)
For NodeMCU / ESP32 / Arduino control:
Use a MOSFET or Relay Module (since pump draws more current than GPIO pins can supply)
Add flyback diode (e.g., 1N4007) across pump terminals to protect against voltage spikes
 
Applications
Automatic Plant Watering System
Mini Fountain or Aquarium
Cooling System
Water Circulation in IoT Projects