Raspberry Pi Dashcam: Build a Car Camera System

Building a dashcam with a Raspberry Pi gives you a customisable car camera system with features that commercial dashcams charge a premium for — GPS overlay, loop recording, and motion detection. This guide shows Indian drivers how to build a reliable Pi dashcam for under ₹6,000.

Why Build a Pi Dashcam

• Customisable: Add GPS overlay, speed data, timestamp, and custom resolution.
• No subscription: No cloud storage fees like commercial dash cams.
• Expandable: Add rear camera, G-sensor, or OBD2 data logging.
• Cost effective: Build for ₹5,000-6,000 vs ₹8,000+ for feature-equivalent commercial units.

Components and Wiring

• Raspberry Pi 4 or Pi Zero 2 W (compact form factor)
• Pi Camera Module 3 (wide-angle preferred)
• MicroSD card (64-128GB, high endurance)
• GPS module (NEO-6M or similar)
• Car USB charger or buck converter (12V to 5V)
• 3D-printed or commercial case

Camera Setup and Configuration

# Enable camera
sudo raspi-config
# Interface Options > Camera > Enable

# Test camera
libcamera-still -o test.jpg

# For wide-angle capture:
libcamera-vid -t 10000 --width 1920 --height 1080 --framerate 30 -o test.h264

Recording Script with Loop Storage

#!/bin/bash
# dashcam-record.sh - Loop recording with auto-cleanup
SAVE_DIR="/home/pi/dashcam"
MAX_SIZE_GB=50
CLIP_DURATION=300  # 5-minute clips

mkdir -p $SAVE_DIR

while true; do
    TIMESTAMP=$(date +%Y%m%d_%H%M%S)
    FILENAME="$SAVE_DIR/dash_$TIMESTAMP.h264"

    libcamera-vid -t ${CLIP_DURATION}000 --width 1920 --height 1080 
        --framerate 30 -o "$FILENAME" --codec h264

    # Convert to MP4
    ffmpeg -i "$FILENAME" -c copy "${FILENAME%.h264}.mp4" && rm "$FILENAME"

    # Cleanup old files when storage exceeds limit
    while [ $(du -sb $SAVE_DIR | cut -f1) -gt $((MAX_SIZE_GB * 1073741824)) ]; do
        OLDEST=$(ls -t $SAVE_DIR/*.mp4 | tail -1)
        rm "$OLDEST"
        echo "Deleted old clip: $OLDEST"
    done
done

GPS and Speed Overlay

Add GPS data overlay to your dashcam footage:

# Install gpsd
sudo apt install gpsd gpsd-clients python3-gps -y

# Connect NEO-6M GPS module:
# VCC -> 3.3V, GND -> GND, TX -> GPIO15 (RX), RX -> GPIO14 (TX)

# Configure UART
sudo raspi-config
# Interface Options > Serial Port > No login shell > Yes hardware

# Test GPS
cgps -s  # Wait for satellite lock (may take a few minutes outdoors)

Power Management in a Vehicle

Indian vehicles use 12V (cars) or 24V (trucks) systems. You need a reliable step-down converter:

• Use a 12V to 5V 3A buck converter with USB-C output.
• Consider a battery-backed UPS HAT for clean shutdown when ignition is off.
• Wire to the ACC (accessory) line so the Pi starts with the ignition.
• Add a graceful shutdown script triggered by GPIO pin detecting power loss.

Viewing and Backing Up Footage

# Set up auto-transfer via WiFi when parked at home
# Add your home WiFi to wpa_supplicant.conf
# Create a sync script:
rsync -avz /home/pi/dashcam/ user@homepc:/backup/dashcam/ 2>/dev/null

# Add to crontab to run every 10 minutes:
*/10 * * * * /home/pi/sync-dashcam.sh

Frequently Asked Questions

{“@context”: “https://schema.org”, “@type”: “FAQPage”, “mainEntity”: [{“@type”: “Question”, “name”: “How hot does a Raspberry Pi get in an Indian car?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Interior car temperatures in Indian summers can reach 60-70u00b0C. The Pi itself can operate up to 85u00b0C but will throttle. Use a metal case as a heatsink and park in shade. Consider a sun visor or windshield shade. The Pi will survive but may not boot until it cools below 85u00b0C.”}}, {“@type”: “Question”, “name”: “Which camera is best for a Pi dashcam?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “The Camera Module 3 with wide-angle lens is ideal. It provides 12MP resolution, autofocus, and good low-light performance. For night driving, the NoIR version with an IR LED array improves visibility.”}}, {“@type”: “Question”, “name”: “Can a Pi dashcam record in loop like commercial dashcams?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Yes, the recording script above implements loop recording with automatic deletion of oldest files when storage is full. You can set clip duration and maximum storage usage.”}}, {“@type”: “Question”, “name”: “Is a Raspberry Pi dashcam legal in India?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Yes, dashcams are legal in India. The Motor Vehicles Act does not prohibit dashboard cameras. In fact, some insurance companies in India offer discounts for vehicles with dashcams.”}}, {“@type”: “Question”, “name”: “How much storage do I need for a Raspberry Pi dashcam?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “At 1080p30 with H.264 encoding, expect 300-400MB per 5-minute clip. A 128GB card stores approximately 25-30 hours of continuous recording with loop deletion.”}}]}