Technical information about gravity sensors

What is a gravity sensor? What functions does it have? We have talked about sensors and smart sensors, but today this is our topic - gravity sensors. When looking for technical information for everyone, the editor can also improve the knowledge level of gravity sensors by walking and learning together.

The cantilever displacer is made of elastic sensitive elements, and the energy storage spring made of elastic sensitive elements is used to drive the electrical contacts to complete the conversion from gravity changes to electrical signals. It is widely used in mid-to-high-end smartphones and tablet computers.

The new sensor technology uses an elastic sensitive element to make a cantilever displacer, and an energy storage spring made of elastic sensitive elements to drive the electrical contacts to complete the conversion from gravity changes to electrical signals. At present, most mid-to-high-end smartphones and tablets have built-in gravity sensors, such as Apple's iPhone and iPad series, Android series mobile phones, etc. The gravity sensor will automatically rotate the screen when the phone is turned horizontally and vertically. When playing games, it can replace up, down, left and right. For example, when playing a racing game, you can lay the phone flat without pressing buttons, and rocking it left and right can replace the left and right movement in the direction of the simulator game.

working principle:

Gravity sensors work based on the principle of piezoelectric effect. The so-called piezoelectric effect is "For heteropolar crystals that do not have a center of symmetry, the external force exerted on the crystal will not only deform the crystal, but also change the polarization state of the crystal and establish an electric field inside the crystal. This kind of mechanical force will The phenomenon of polarizing a medium is called the positive piezoelectric effect."

The gravity sensor takes advantage of its internal crystal deformation caused by acceleration. Since this deformation generates a voltage, the acceleration can be converted into a voltage output simply by calculating the relationship between the generated voltage and the applied acceleration. Of course, there are many other methods to make acceleration sensors, such as capacitance effect, thermal bubble effect, and light effect, but the most basic principle is that acceleration produces deformation of a certain medium, and the deformation is measured and converted into voltage output.

application:

1. By measuring the acceleration caused by gravity by a gravity sensor, the tilt angle of the device relative to the horizontal plane can be calculated. By analyzing dynamic acceleration, you can analyze the way a device moves. But at first, you'll find that measuring inclination and acceleration with light doesn't seem very useful. But now engineers have figured out many ways to get more useful information.

2. The acceleration sensor can help the bionic robot understand the environment it is currently in. Are you climbing a mountain, going downhill, or falling. Or for flying robots, it is also crucial to control the attitude. A good programmer can answer all of the above questions using an accelerometer.

3. Gravity sensors can be used to analyze engine vibration.

4. Before entering the consumer electronics market, gravity sensors have actually been widely used in the field of automotive electronics, mainly focusing on body control, safety systems and navigation. Typical applications include automotive airbags and ABS anti-lock braking systems. , electronic stability program (ESP), electronically controlled suspension system, etc.

mobile application:

The gravity sensor is a device first developed by Apple, which is now used on iPhone and iPod-nano4. To put it simply, if you hold the phone vertically in your hand, if you turn it 90 degrees and turn it sideways, its page will automatically respond to your center of gravity, which means that the page will also turn 90 degrees. , extremely humane. The above is the relevant technical knowledge of gravity sensors. I hope it can help you.