Overview of sensors in modern smartphones

Overview of sensors in modern smartphones

You can also make calls with a smartphone. This statement describes the functional scope of today’s mobile devices well. You have a large number of sensors to record parameters from the environment.

This article provides an overview of the most important antennas for perceiving the outside world. The following parts of the series are then about technology and programming.

Current smartphones are literally “crammed” with sensors. These include a. Ambient light, proximity, acceleration and rotation sensor (gyroscope), electromagnetic sensor, digital compass (magnetometer), fingerprint scanner and sensors for location determination (GPS).

The fact that you can also make calls with a smartphone is almost forgotten with this diversity. Smartphones are suitable for a wide range of measurement tasks from a wide variety of areas in private and professional environments. The measurement data can be comprehensively processed in apps.

Regardless of whether it is developed for Android or iOS, and whether it is a native or a hybrid app, you have to know the basic functionality, application and limitations of the sensors in order to use them in your own app. We want to give such an overview with this series of articles. Let’s take a closer look at the individual sensors.

Camera

That’s right, the cameras in a smartphone are also sensors. The quality of these cameras is one of the decisive factors when choosing a new smartphone. In the meantime, the quality of the recordings that can be made has also increased significantly.

In many cases, cell phone cameras no longer have to fear comparison with the image quality of a simple compact camera. The size of the camera’s sensor surface has a decisive influence on the image quality. The relationship between resolution and sensor size also plays an important role.

A resolution of 20 million megapixels means that the sensor has the same number of light cells to take the picture. As a result, the stored images have the same number of pixels. Larger pixels (sensor surface) can absorb more light and have a positive effect on image quality.

The structure of the image sensors also has an influence on the image quality. A distinction is made between Front Side Illumination (FSI), i.e. the wiring on the front between the incident light and the sensor surface, and Back Side Illumination (BSI), the wiring on the back of the sensors.

With BSI, shadows on the sensor surface are avoided and a higher light sensitivity is achieved. The lens largely determines the optical properties of the camera.

So the wiring on the front between the incident light and the sensor surface, and the Back Side Illumination (BSI), the wiring on the back of the sensors. With BSI, shadows on the sensor surface are avoided and a higher light sensitivity is achieved.

The lens largely determines the optical properties of the camera. So the wiring on the front between the incident light and the sensor surface, and the Back Side Illumination (BSI), the wiring on the back of the sensors. With BSI, shadows on the sensor surface are avoided and a higher light sensitivity is achieved.

The lens largely determines the optical properties of the camera. Modern smartphones have ID usually via several cameras. They have a front and a rear camera, with the rear camera, usually with a much higher resolution, facing away from the viewer, while the front camera is used for video telephony or for taking self-portraits.

With the help of dual cameras, two sensors and lenses are arranged side by side. One goal is to improve the image quality by calculating the image information from both cameras into one recording. Both lenses can also have different focal lengths (wide angle vs. zoom). With two cameras, the software can also add special effects to an image, e.g. B. Sharpness and blurring effects.

Microphone

The microphone is primarily used to make phone calls. Other applications that evaluate the audio signals from the microphone are conceivable. For example, as a voice recorder, for voice control of apps (artificial intelligence), for measuring ambient noise, as a simple baby monitor or for room monitoring. In addition to the built-in microphone, an external microphone, that is usually connected with headphones.

 

You may also like...