Raspberry Pi Surveillance Camera Project: Setup and Code

You can create a surveillance camera project on a Raspberry Pi using the picamera library to control the camera module and capture video or images. The project involves setting up the camera hardware, writing Python code to record or stream video, and optionally saving footage for later review.

Syntax

The basic syntax to use the Raspberry Pi camera with Python involves importing the picamera module, creating a camera object, and using methods like start_preview(), capture(), and start_recording() to control the camera.

Key parts:

• picamera.PiCamera(): Creates the camera object.
• start_preview(): Shows a live preview on the screen.
• capture('filename.jpg'): Takes a photo and saves it.
• start_recording('filename.h264'): Starts video recording.
• stop_recording(): Stops video recording.

python

from picamera import PiCamera
from time import sleep

camera = PiCamera()
camera.start_preview()
sleep(5)  # Preview for 5 seconds
camera.capture('image.jpg')  # Take a photo
camera.stop_preview()

Example

This example shows how to record a 10-second video using the Raspberry Pi camera and save it as video.h264. It demonstrates starting the preview, recording, and stopping the recording.

python

from picamera import PiCamera
from time import sleep

camera = PiCamera()
camera.start_preview()
sleep(2)  # Let camera adjust
camera.start_recording('video.h264')
sleep(10)  # Record for 10 seconds
camera.stop_recording()
camera.stop_preview()

Output

A 10-second video file named 'video.h264' is saved in the current directory.

Common Pitfalls

Common mistakes when building a Raspberry Pi surveillance camera include:

• Not enabling the camera interface in Raspberry Pi settings.
• Forgetting to install the picamera library.
• Not giving enough time for the camera to adjust before capturing.
• Using incorrect file extensions for video files (use .h264 or convert to .mp4).
• Not handling permissions or storage space for saving videos.

python

from picamera import PiCamera

# Wrong: Not starting preview or waiting before capture
camera = PiCamera()
camera.capture('image.jpg')  # May result in dark or blank image

# Right: Start preview and wait before capture
from time import sleep
camera.start_preview()
sleep(2)
camera.capture('image.jpg')
camera.stop_preview()

Quick Reference

Summary tips for Raspberry Pi surveillance camera:

• Enable camera in Raspberry Pi Configuration.
• Install picamera with pip install picamera.
• Use start_preview() and wait before capturing.
• Save videos as .h264 or convert to .mp4 for compatibility.
• Ensure enough storage and proper file permissions.

Key Takeaways

Enable the Raspberry Pi camera interface before starting your project.

Use the picamera Python library to control the camera and capture images or videos.

Always start a preview and wait a few seconds before capturing for better image quality.

Save video files in supported formats and manage storage space carefully.

Test your setup step-by-step to avoid common mistakes like missing permissions or wrong file extensions.