R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 1
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 2
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 3
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 4
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 5
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 6
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 7
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 8
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 9
R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump - Image 10

R385 DC Diaphragm Water Air Pump 6–12V Mini Low Noise Priming Pump

L9110 5V Fan Motor Module with Propeller Arduino Robot Airflow DIY
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Description

💧 R385 DC Diaphragm Micro Water Pump – 6–12V Low Noise Priming Pump for Water & Air | AuscomTech

The R385 DC Diaphragm Micro Pump is a compact, efficient, and low-noise pump designed for light-duty water and air transfer applications.
Using a diaphragm-based pumping mechanism, this pump offers reliable self-priming performance, stable flow, and quiet operation in a small footprint—making it ideal for aquariums, water dispensers, sampling systems, and DIY fluid-handling projects.

Designed to operate from a DC 6–12V supply, the R385 pump is well suited to portable, battery-powered, and embedded systems where space, noise, and efficiency are important.

⭐ Key Features

💧 Diaphragm Pump Design (Self-Priming)
Efficient diaphragm structure allows quick start/stop operation, stable pressure output, and self-priming capability.

🔇 Low Noise Operation
Integrated vibration damping and noise-reduction design provide quiet operation suitable for indoor, desktop, and aquarium environments.

⚡ Wide DC Voltage Range (6–12V)
Compatible with common DC power supplies and battery systems.
Recommended supply: 9V–12V, ≥1A for stable operation.

📦 Compact & Lightweight Form Factor
Small size and low weight make it easy to mount in confined spaces and portable designs.

🔁 Water & Air Transfer Capability
Suitable for pumping clean water or air in non-pressurised systems.

🛠️ Reliable & Durable Construction
Manufactured using quality materials for consistent performance and a service life of up to 2500 hours under correct operating conditions.

📊 Technical Specifications

Pump Type

  • Model: R385 DC Diaphragm Pump

  • Structure: Diaphragm (self-priming)

  • Drive Type: Electric DC motor

Electrical

  • Operating Voltage: DC 6–12V

  • Recommended Supply: 9V–12V, ≥1A

  • Working Current: 0.5 – 0.7 A

  • Power @ 6V: ~6 W

Hydraulic Performance

  • Flow Rate: 1.5 – 2.0 L/min (approx.)

  • Maximum Suction Lift: 2 m

  • Maximum Head (Lift): Up to 3 m

  • Outlet Diameter:

    • Inner: 6 mm

    • Outer: 9 mm

Mechanical

  • Pump Size: 94 × 47 × 47 mm

  • Service Life: Up to 2500 hours

Media

  • Suitable Liquid: Clean water only

  • Media Type: Water / Air (non-corrosive, non-viscous)

🧩 Compatible With

• DC bench power supplies
• 6–12V battery systems
• Arduino / ESP32 projects (with external power supply)
• Aquariums and fish tanks
• Water dispensers
• Sampling and circulation systems
• DIY fluid handling setups

🔧 Typical Applications

• Aquarium and fish tank circulation
• Water dispensers and tea machines
• Sampling pumps for sensors and probes
• DIY irrigation and spraying systems
• Water transfer for small containers
• Air pumping for light aeration
• Embedded and portable projects

⚠️ Important Usage Notes

• Not a booster pump – cannot withstand high inlet pressure or high outlet resistance
• Not suitable for continuous long-term operation at high head or suction
• Use clean, non-corrosive, non-viscous water only
• Do not use PVC pipes or adhesive bonding on inlet/outlet – use silicone tubing only
• Do not expose the pump to moisture, steam, or wet environments
• Do not power from:

  • 9V disposable batteries

  • USB ports or phone chargers

  • Four dry-cell batteries
    • Ensure the motor heat dissipation hole is not covered during installation

📦 Package Includes

• 1 × R385 DC Diaphragm Micro Water Pump

📌 Code Examples & Usage – DC 6V–12V R385 Mini Diaphragm Water Pump

📋 Overview

The R385 DC Mini Diaphragm Pump is a compact, self-priming micro pump designed for low-pressure liquid or air transfer applications.
It is commonly used in aquariums, water dispensers, sampling systems, small irrigation setups, cooling loops, and DIY automation projects.

This pump is NOT a booster pump and must be controlled using a relay or motor driver when used with microcontrollers such as Arduino or ESP32.

Typical use cases include:

  • Fish tank circulation

  • Water sampling systems

  • Small spray or misting systems

  • Automated fluid dosing (low pressure)

  • Water / air transfer for DIY projects

⚙ Key Features / Notes

  • Operating voltage: DC 6–12V (9–12V recommended)

  • Typical current draw: 0.5–0.7A

  • Self-priming diaphragm design

  • Flow rate: ~1.5–2.0 L/min

  • Maximum suction lift: 2m

  • Maximum head: ~3m

  • Hose size: 6mm ID / 9mm OD

  • Continuous duty not recommended at max load

⚠ This pump cannot be driven directly from Arduino / ESP32 pins.

⚠ IMPORTANT NOTES (READ BEFORE USE)

  • ❌ Do NOT power from USB, phone chargers, or 9V rectangular batteries

  • ❌ Do NOT connect directly to GPIO pins

  • ❌ Not a pressure or booster pump

  • ❌ Not suitable for corrosive, viscous, or dirty liquids

  • ⚠ High suction or blocked outlet can damage the diaphragm

  • ⚠ Continuous operation at high load reduces lifespan

  • ⚠ Ensure motor ventilation holes are NOT covered

✅ Always use:

  • External DC power supply (≥1A)

  • Relay or motor driver

  • Flyback diode or protected driver module

🔌 Wiring / Connections

Pump Power (Standalone)

Wire Function
Red +6–12V DC
Black GND

Arduino / ESP32 Control (Relay Module – Recommended)

Relay Module Connect To
IN Arduino GPIO
VCC 5V (relay logic)
GND Common GND
COM +V from power supply
NO Pump +
Pump – Power supply GND

⚠ Relay is required — do not drive motor directly.

🧪 Code Example – Arduino (Relay Control)

#define PUMP_RELAY_PIN 7

void setup() {
pinMode(PUMP_RELAY_PIN, OUTPUT);
digitalWrite(PUMP_RELAY_PIN, LOW); // Pump OFF
}

void loop() {
digitalWrite(PUMP_RELAY_PIN, HIGH); // Pump ON
delay(5000); // Run for 5 seconds

digitalWrite(PUMP_RELAY_PIN, LOW); // Pump OFF
delay(10000); // Pause
}

✅ Works with Arduino UNO, Nano, Mega
✅ ESP32 compatible (use GPIO-safe relay module)

🧪 ESP32 Note (IMPORTANT)

  • ESP32 uses 3.3V GPIO

  • Many relay modules require 5V logic

  • Use:

    • ESP32-compatible relay module, or

    • Logic-level MOSFET driver module

🔋 Power / Installation Notes

  • Recommended supply: 9V–12V DC, ≥1A

  • Use short silicone tubing (6mm ID)

  • Avoid sharp bends or restrictions

  • Mount pump securely to reduce vibration

  • Do not submerge motor body

  • Allow airflow around motor housing

🧠 Common Issues & Fixes

Issue Cause Fix
Pump not running Insufficient current Use ≥1A power supply
Weak flow Blocked inlet/outlet Check tubing
Pump noisy Dry running Prime with water
Overheating Continuous high load Add duty cycle
ESP32 resets Shared power Separate motor supply

Additional information

Weight 150 g
Dimensions 260 × 160 × 50 mm

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