Project idea
Use a Raspberry Pi and camera for drowsiness detection, trigger a 12V mini air pump to inflate an airbag on impact, and notify emergency contacts via a GSM module while showing status on an LCD.
Project description
A Pi camera monitors the driver and raises an audible alert plus uploads a snapshot to an IoT page on drowsiness; impact is detected by an SW-420 vibration sensor to auto-inflate an airbag using a 12V pump and send SMS alerts via GSM.
A limit switch confirms full inflation; if not reached in time, a relay-driven power cutoff illustrates pump failure and triggers a police alert SMS, with current status presented on a 16x2 LCD.
Total list of components
Raspberry Pi 4 Model B (4GB).
Raspberry Pi Camera Module V2.
GSM Module (SIM800L).
Vibration Sensor (SW-420 module).
12V DC mini air pump.
Inflatable air wedge/airbag.
1‑Channel 5V relay module (AC switch).
Limit switch (lever/roller type).
16x2 LCD with I2C interface.
Regulatory circuitry (5V regulation for Pi).
PCB board (for interface circuitry).
Resistors.
Capacitors.
Transistors.
Cables and connectors.
Features
Camera-based driver drowsiness detection with audible alert and snapshot logging.
Impact/jerk sensing via SW‑420 to trigger emergency workflow.
Automatic airbag inflation using a compact 12V mini pump.
GSM SMS alerts to pre‑registered numbers for hospital and police.
Airbag fill confirmation using a limit switch for positive feedback.
Fail‑safe notification if airbag doesn’t inflate within a time window via relay cutoff demo.
On-device status display on a 16x2 LCD with I2C for simple wiring.
Applications
Educational prototype for intelligent in‑vehicle safety systems.
Demonstrations of drowsiness detection, impact sensing, and alerting.
Lab training on GSM notifications and actuator control.
Dimensions (cm)
Approx. 25 x 20 x 10 cm(L x W x H) assembled on an enclosure to house the Pi, pump, LCD, and wiring.
Shipping dimensions (cm)
Approx. 30 x 24 x 14 cm(L x W x H) with protective inflatable packaging as needed.
Weight
Approx. 0.8–1.0 kg including the pump, Pi, LCD, mounts, wiring, and enclosure; the pump is ~70 g, and a typical display is ~33 g.
Estimate project weight
Target packed weight ≈ 1.2 kg including protective packaging and accessories.
Car Safety Airbag Notifier.
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