Gravity: digital peristaltic pump is a new product developed by DFRobot. This is a new member of our water quality monitoring devices. It is an actuator for the liquid system.
DFRobot peristaltic pump integrates a PPM motor driver on the pump, this is a Gravity interface (PH2.0-3P) motor driver. The control signal is compatible with standard servo motor, you can use Arduino, Raspberry Pi, micro:bit, and other kinds of microcontrollers to control its direction and flow speed. The tube in the pump head is made up of BPT material, which is anti-acid and long life.
Peristaltic pumps are a kind of positive displacement pump used for delivering small amounts of fluid. The fluid is contained within a flexible tube fitted inside a circular pump casing. When the rotor rotates continuously, the fluid in the tube will be squeezed and deliver to the other side. In this way, the liquid flow rate can be easily accuracy controlled.

As a kind of metering pump, peristaltic pump can be conveniently used for quantitative delivery. It has a wide range of application scenarios, such as science experiment, hydroponics, drip irrigation, tropical fish farming, shrimp cylinder environment control, etc. A large number of titration experiments can be automated with this peristaltic pump, such as potentiometric titration, indicator-based colorimetric titration, pH-based titration, and so on. It is great helpful to improve your working efficiency
On the other hand, peristaltic pumps also have a wide range of applications in food, medical and other industries. Making an automatic coffee machine will be a really good idea!
 Attention:  Since the motor power consumption (about 5W) is a little large, it’s better to add an external power supply on your microcontroller, USB port can only provide 2.5W power supply.

 Note:  Due to the material characteristics of the fluorine rubber tube, installed in the pump head for a long time without the media does not work in the placement of extrusion, there is a small chance that the wall of the tube will stick, resulting in the possibility of not being able to absorb liquid.

If the tube is stuck, you can remove it and twist it by hand to restore the elasticity of the pump tube.

Even if the pump tube for a long time, as long as there is liquid in the pump tube, the problem will not happen.

If the pump does not work for a long time without medium because of the material characteristics, there is a probability of slippage.

If this happens, you can remove the pump head and adjust the elasticity of the pump tube to ensure that there is liquid in the pump tube to effectively slove the problem.

Peristaltic pump

• Low noise,
• Low cost,
• Simple structure,
• Easy to maintain,
• Three rotors with moderate pulsation,
• Non-toxic and pollution-free

Driver board

• Gravity 3Pin digital connector, plug and play
• Servo PPM control signal, driving easily and compatible with Arduino, Raspberry Pi, micro: bit and other controllers.

Driver Board

• Input Voltage: 5V-6V
• Maximum Continuous Operating Current: 1.8A
• Peak Current: 2.5A
• Quiescent Current: <1mA (No PPM Signal Input)
• PPM Signal Resolution: 1us
• Positive Pulse Width of the PPM Signal: 500us-2500us
• Forward Pulse Width Range: 500us-1400us (500us: max forward speed)
• Stop Pulse Width Range: 1400us-1600us
• Inverted Pulse Width Range: 1600us-2500us (2500us: max inverted speed)
• PPM Frequency: 50Hz (Servo Control Signal)
• Connector: Gravity PH2.0-3P
• Size: 27.4 x 28.7 mm/1.08 x 1.13 inches

Peristaltic Pump

• Motor: DC Motor
• Rated Voltage: 6V
• Rated Power: 5W
• Tube Material: BPT
• Tube Specifications: inner diameter 2.5mm, outer diameter 4.5mm
• Pump Head Material: Engineering Plastics
• Pulsation: Three Rollers, Small Pulsation
• Flow: ≥45ml/min
• Working Conditions: ambient temperature 0 ~ 40 ℃, relative humidity <80%

Project. Hyduino - Automated Hydroponics with an Arduino
hydroponics is growing plants without the use of a traditional dirt medium by using a nutrient-rich water solution. This is especially great for those people that have limited areas in their backyard to grow in.
Hardware list:

• Arduino Mega 2560
• Peristaltic Pumps (2)
• Regular Pump
• pH Electrode Probe and Connection to Arduino pH Up/Down Solution
• 5V Relay Modules for Arduino
• 12V Solenoid Valve
• DHT11 or DHT21 or DHT22 Humidity/Temperature Sensor
• Photosensitive Sensor for Arduino
• Breadboard
• Various Wires
• Grow Lights (mine are LED)
• Sockets for Grow Lights
• 3.2" TFT LCD Shield + Touch Screen (usually has an SD card reader on the back of it)
• Water Level Sensor Float Switch (2)
• I2C RTC DS1307 AT24C32 Real Time Clock Module
• 9V and 12V Power Supplies
• Hydroponics Pots (I'm using 10 - 3" pots for this)
• 1" PVC Pipe and Fittings + Drain Pipe and Fittings

• Product wiki
• Code Resources

• Gravity: digital peristaltic pump with PPM motor driver x1
• Digital sensor cable x1
• Silicone tube (1m) x1
• 10mL plastic measuring cylinder x1