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Lesson 31: Centrifugal Pump

In this lesson, you will learn how to control a pump using a Raspberry Pi. You’ll learn how to write a Python script to activate the pump, control its speed, and then stop it after a set period. This project provides a basic understanding of pump control through GPIO interfacing and Python programming, making it a suitable starting point for beginners interested in Raspberry Pi and simple pump applications.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Raspberry Pi 5	BUY
Centrifugal Pump	-
L9110 Motor Driver Module	-

Wiring

Code

from gpiozero import Motor
from time import sleep

# Define pump pins
pump = Motor(forward=17, backward=27)  # Using Raspberry Pi GPIO pin numbers

# Activate the pump
pump.forward(speed=1)  # Set pump speed, range is 0 to 1
sleep(5)               # Run the pump for 5 seconds

# Deactivate the pump
pump.stop()            # Stop the pump

Code Analysis

Import Libraries

The gpiozero library is used for controlling the motor, and the time library’s sleep function is for delays.
```
from gpiozero import Motor
from time import sleep
```
Define Pump Pins

A Motor object is created with two GPIO pins: one for forward and one for backward operation. In this case, GPIO 17 and 27 are used.
```
pump = Motor(forward=17, backward=27)
```
Activate the pump

The motor is activated in the forward direction with a specified speed using pump.forward(speed=1). The speed parameter ranges from 0 (stopped) to 1 (full speed). The motor runs for 5 seconds, as defined by sleep(5).
```
pump.forward(speed=1)
sleep(5)
```
Deactivate the pump

The motor is stopped using pump.stop(). This is essential for safely halting the motor’s operation after the required duration.
```
pump.stop()
```