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
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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Additionally, some of these links are for products from our own brand, DIYables.
Additionally, some of these links are for products from our own brand, DIYables.
Wiring Diagram
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!