Under what circumstances is sensor for a driving recorder required

1. Image Sensor

Function: Captures visual information and enables video recording.

Application Scenarios: Continuously records driving scenes, road conditions, license plates, pedestrians, and other visual evidence. In parking monitoring mode, it triggers recording based on changes in the frame (low-end models rely on image analysis for motion detection).

2. G-Sensor (Acceleration Sensor)

Function: Detects physical impacts (e.g., collisions) and protects critical evidence. It continuously monitors acceleration changes (such as collisions, sudden braking, or severe) and automatically marks and locks the current video when the G-value exceeds a threshold, preventing overwriting (to avoid losing accident footage).

Application Scenarios: In traffic accidents, G-value data helps determine the intensity and process of collisions, assisting in liability assessment (e.g., distinguishing minor scratches from severe impacts). Some devices use G-sensors to detect vibrations when the vehicle is parked, activating parking monitoring mode.

3. Motion Sensor (Movement Detection Sensor)

Function: Monitors environmental changes and triggers response mechanisms. It detects moving objects within the camera’s field of view (such as pedestrians or vehicles approaching), distinguishing between "static environments" and "dynamic events."

Application Scenarios: Triggers recording or alarms to reduce unnecessary continuous recording, saving storage space and power (e.g., recording only when moving objects are detected while parked). High-end models may feature independent hardware sensors (such as Passive Infrared Sensors, PIR) to directly detect infrared energy from human bodies, improving detection accuracy.

Extended Sensors in Great-will Targestar Dash Cams

To ensure the device operates stably in various environments and over long periods, some models are equipped with additional sensors:

GPS Sensor: Records driving routes, speed, time, and other information (GPS data is overlaid on videos) for accident liability assessment or route tracking. It can be built into the device or connected via an external antenna and requires map software for route playback.

Temperature Sensor: Monitors internal device temperature and triggers protection mechanisms (such as automatic shutdown) in high temperatures to prevent component damage. This is particularly useful in summer to avoid overheating of the image sensor or battery due to prolonged exposure to sunlight.

How Sensors Work Together

Normal Driving: The image sensor records continuously, while the G-sensor remains passive until vibrations are detected.

Accidents or Impacts: The G-sensor triggers emergency recording and locks the footage; the image sensor captures the event, and the GPS (if enabled) records location and speed data.

Parking Monitoring Mode: The motion sensor "wakes up" the dash cam to record when movement is detected, while the G-sensor monitors for impacts.

Why Sensor Quality Matters

Low-Light Performance: High-quality image sensors (such as Sony STARVIS) ensure clear footage at night, which is critical for capturing license plates or accident details in dark environments.

False Trigger Control: Well-calibrated G-sensors and motion sensors reduce unnecessary recordings (e.g., from minor vibrations), saving storage and power.

Reliability: Sensors must withstand extreme temperatures (e.g., -20°C to 70°C) to ensure stable performance in different climates.

The Irreplaceability of Basic Sensors

Image Sensor: The foundation of video recording—no imaging is possible without it.

G-Sensor: Core to evidence protection—critical footage cannot be locked automatically without it.

Motion Sensor: Essential for parking monitoring—even low-end models rely on image analysis for this basic function.

Purchase Recommendations

Prioritize the performance of the three basic sensors (e.g., image sensor model, G-sensor brand) and then consider extended features like GPS or temperature monitoring to ensure the device meets basic usage requirements.

By combining these sensors, dash cams provide comprehensive coverage for safety, anti-theft, and evidence collection. When choosing a dash cam, prioritize models with high-quality sensors (especially for image and G-sensor performance) to achieve optimal functionality.