Raspberry Pi - Button - Pump

This tutorial instructs you how to use Raspberry Pi to turn on a pump for a few seconds when a button is pressed and then turns it off.

Hardware Preparation

1×Raspberry Pi 4 Model B
1×Breadboard-mount Button with Cap
1×Breadboard-mount Button Kit
1×Panel-mount Push Button
1×Relay
1×12V Pump
1×Vinyl Tube
1×12V Power Adapter
1×DC Power Jack
1×Jumper Wires
1×(Optional) Screw Terminal Adapter for Raspberry Pi
1×(Optional) USB-C Power Cable with On/Off Switch for Raspberry Pi 4B
1×(Optional) Plastic Case and Cooling Fan for Raspberry Pi 4B

Or you can buy the following sensor kits:

1×DIYables Sensor Kit (30 sensors/displays)
1×DIYables Sensor Kit (18 sensors/displays)
Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables.

Overview of Button and Pump

If you are unfamiliar with pump and button (including pinout, functionality, and programming), the following tutorials can provide assistance:

Wiring Diagram

The wiring diagram between Raspberry Pi and Button controls Pump

This image is created using Fritzing. Click to enlarge image

Raspberry Pi Code

Detailed Instructions

  • Make sure you have Raspbian or any other Raspberry Pi compatible operating system installed on your Pi.
  • Make sure your Raspberry Pi is connected to the same local network as your PC.
  • Make sure your Raspberry Pi is connected to the internet if you need to install some libraries.
  • If this is the first time you use Raspberry Pi, See how to set up the Raspberry Pi
  • Connect your PC to the Raspberry Pi via SSH using the built-in SSH client on Linux and macOS or PuTTY on Windows. See to how connect your PC to Raspberry Pi via SSH.
  • Make sure you have the RPi.GPIO library installed. If not, install it using the following command:
sudo apt-get update sudo apt-get install python3-rpi.gpio
  • Create a Python script file button_pump.py and add the following code:
""" This Raspberry Pi code was developed by newbiely.com This Raspberry Pi code is made available for public use without any restriction For comprehensive instructions and wiring diagrams, please visit: https://newbiely.com/tutorials/raspberry-pi/raspberry-pi-button-pump """ import RPi.GPIO as GPIO import time BUTTON_PIN = 18 # GPIO pin connected to the button RELAY_PIN = 16 # GPIO pin controls the pump via the relay module # Set up the GPIO pins GPIO.setmode(GPIO.BCM) GPIO.setup(BUTTON_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.setup(RELAY_PIN, GPIO.OUT) prev_button_state = GPIO.HIGH # HIGH means the button is not pressed initially try: # Lock the door initially GPIO.output(RELAY_PIN, GPIO.HIGH) while True: button_state = GPIO.input(BUTTON_PIN) if button_state == GPIO.LOW and prev_button_state == GPIO.HIGH: # Button is pressed (LOW means pressed due to pull-up resistor) print("The button is pressed") GPIO.output(RELAY_PIN, GPIO.HIGH) # turn pump on print("The door is unlocked") time.sleep(5) # Wait for 5 seconds GPIO.output(RELAY_PIN, GPIO.LOW) # turn pump off print("The door is locked again") # Update the previous button state prev_button_state = button_state except KeyboardInterrupt: print("Exiting...") GPIO.cleanup()
  • Save the file and run the Python script by executing the following command in the terminal:
python3 button_pump.py
  • Press the button
  • Check out the pump's condition

The script runs in an infinite loop continuously until you press Ctrl + C in the terminal.

Code Explanation

Check out the line-by-line explanation contained in the comments of the source code!

Video Tutorial

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