The footage from your dashboard camera is an important piece of evidence when it comes to accidents that you were unfortunate enough to suffer. The same dashboard camera can also help you in case of mishaps that take place when your vehicle is peacefully parked, either in your garage or in a public parking. To achieve that, you basically set up your camera to work all the time. You can hardwire it to the power supply so that it keeps receiving the power even when the ignition is turned off.
However, the storage capacity of the dash cam is rather limited and it cannot record everything that happens for many hours while your vehicle is parked. The common dash cam is designed run in a loop so that it keeps overwriting the oldest data with the latest one. While driving, the driver knows the important events which need to be saved and not overwritten and can manually ensure that. However, during the night, the camera has to decide by itself about which data is to be saved so that important information is not lost because it was overwritten by something else.
Generally, two types of footage is deemed important by the dashboard camera: the footage which shows some movement and the footage that shows an impact on the vehicle. When there is a significant impact, which obviously means your vehicle is being hit by something (probably by a novice driver trying to back up his car in the public parking lot), a signal called the G-sensor is activated and the footage around the impact is saved automatically by the camera. The G-sensor measures the acceleration (which is zero when your car is parked). When the car receives a sudden jerk, it monetarily accelerates, thus activating the sensor.
Similarly, the motion sensor gets activated as soon as some motion is detected by the camera. These sensors are the same as those in your home security systems and work on similar principles. An important question that can be asked here is why we must keep the camera on constant recording mode when all we need to do is start recording as soon as the sensor is activated? This is because the camera takes a few seconds to get activated and even if that was not the case, we would ideally need footage from a few moments before the g or motion sensor got activated.
Also, you do not want your dash cam to completely drain your car battery. This becomes a problem if the vehicle is parked for more than 2 days. To avoid this, look at the best dash cam uk site as it shows a list of cameras with this auto switch off feature. This feature will shut down your camera as soon as the voltage of your car battery starts going below a pre-defined limit.
Perhaps the final piece of technology required is night vision. Most cameras achieve it through infra-red technology: the camera emits infra-red radiation – which is invisible to the human eye – and then forms ten image based on the light that is reflected back from objects.