Gravity: Digital Peristaltic Pump

The Gravity Digital Peristaltic Pump is a compact liquid actuator featuring an integrated PPM motor driver for accurate fluid metering. Controlled just like a standard servo motor, it connects easily to Arduino, Raspberry Pi, and BBC micro:bit boards. It is ideally suited for students, hobbyists, and researchers building automated titration setups, hydroponic dosers, or aquarium systems.

Standard servo PPM control

The onboard driver accepts a standard 50Hz PPM servo signal via a 3-pin Gravity interface, allowing you to regulate speed and direction using basic pulse-width commands. This compatibility ensures seamless integration with microcontrollers without requiring specialised motor shield hardware.

Accurate positive displacement delivery

Using a three-roller rotor assembly, this positive displacement pump compresses flexible tubing to transfer fluids smoothly with low pulsation at rates of 45 mL per minute or higher. Because the pumped liquid only contacts the inside of the tube, the system prevents cross-contamination and maintains clean fluid delivery.

Durable acid-resistant BPT tubing

The pump head is fitted with long-life BPT tubing with a 2.5 mm internal diameter and 4.5 mm outer diameter, providing excellent resistance against acidic liquids. If stored dry without use for extended periods, the tubing can be detached and gently flexed by hand to restore its original elasticity.

Versatile liquid handling applications

This metering pump automates precision tasks such as colorimetric, potentiometric, or pH-based titrations in laboratory setups. It is equally useful for automated garden irrigation, aquarium nutrient dosing, and custom beverage dispensers.

External power supply requirements

The pump motor operates at 6V with a rated consumption of approximately 5W and a peak current draw of 2.5A. Because a standard computer USB port typically only supplies up to 2.5W, powering your development board with an external power source is recommended for stable performance.

Included accessories in the box

Each unit comes complete with the digital peristaltic pump and attached driver board, a Gravity digital sensor cable, one metre of silicone tubing, and a 10 mL plastic measuring cylinder for calibration.

Downloads & documentation

• Product wiki (DFRobot)