What does sensordonotblock do?

First distinguish between SOC and MCU:

MCU: Micro Control Unit, micro-control unit, such as STM32 microcontroller.

SOC: System on Chip, the chip can run Linux, Android and other systems.

Sensorhub: Smart Sensor Hub is a hardware and software solution based on a low-power MCU and a lightweight RTOS operating system, whose main function is to connect and process data from various sensor devices. The main function is to connect and process data from various sensor devices. The purpose of the birth of the main purpose is to solve the problem of power consumption in mobile devices. For example, it is hoped that when the main control of the cell phone is dormant, it can still obtain data, and the power consumption of the MCU is much smaller than that of the SOC.

In the case of CPU hibernation, real-time control of sensors can be realized, so as to achieve the function of reducing power consumption.

Fusing data from different types of sensors to realize the functions that can only be achieved by combining data from multiple sensors.

Multiple physical sensor data can be disassembled or fused into virtual sensors as needed to meet functional requirements.

Sensor Hub can perform the following operations:

Gesture recognition: Sensing human gestures, such as: flipping the phone, tapping the phone, shaking the phone, picking up the phone and other gestures. Realizable cases: flip to mute, reject calls, shake to switch the background image and pick up to answer calls.

Device state recognition: Sense the state of the device, such as: the phone face up/down, the phone on the table, or in the pocket, or in the hand. Realizable cases: When the phone is in the pocket, the ringer will be automatically turned up to the maximum level; when it is on the table, it will be turned to the silent vibration mode.

User State Recognition: Sensing the user's state, such as running, walking, standing, sitting, etc. Function: Automatically turn on the step counting function when walking/running, and pause the function when standing and sitting down.

User transportation behavior: Sense the user's state when taking transportation, such as: driving, taking the train, taking the elevator, and so on. Realize the function: in the driving state, automatic Bluetooth connection; while in the train to answer the phone, turn on the noise cancellation function.

Physical Sensors

In embedded mobile devices, such as smartphones, smart wearable, home medical devices and some other smart hardware devices, the physical sensors used are generally MEMS sensors, i.e., Microelectro Mechanical System (Microelectro Mechanical System) sensors. Compared with traditional sensors, MEMS sensors are smaller in size, lighter in weight, lower in cost, lower in power consumption, higher in reliability, and easier to integrate and develop.

At present, MEMS sensors are mainly accelerometer (Accelerometer), magnetometer (Magnetometer), gyroscope (Gyroscope), light sensor (Ambient light sensor), close to the light (Proximity), barometer (Barometer/pressure), humidity meter (Proximity). pressure), humidity meter (Humidometer) and so on, according to the type can be divided into environmental sensors, motion sensors, health sensors.

1, acceleration sensors

Accelerometer (Accelerometer), also known as gravity sensors, is able to sense the acceleration in any direction (gravity acceleration is just the surface of the vertical direction acceleration), accelerometer through the measurement of the component in a certain axial force to get the results, the expression of axial acceleration in the form of the size and direction of the acceleration (X, Y, Z). The principle is based on the vibration inside the sensor. The principle is based on the vibrating structure inside the sensor, which measures the acceleration of the object due to the external acceleration that affects the vibration characteristics of the internal structure. There are many uses for accelerometers, almost all of which are related to the movement of smart hardware (such as cell phones) (pedometer, attitude measurement of cell phones, related games, etc.).

2, gyroscope sensor

Gyroscope, there is a three-axis gyro inside the sensor. The working principle of the gyroscope is through the measurement of three-dimensional coordinate system within the vertical axis of the gyroscope rotor and the angle between the device, and then to calculate the angular velocity, so that you can by the angle and angular velocity to discern the object's state of motion in three-dimensional space. Gyroscope is also very much in use, such as digital photo anti-shake, as well as with the accelerometer (some have magnetic sensors or GPS, etc.) to form a fusion sensor to complete more advanced functions (such as inertial navigation).

3, magnetometer sensor

Magnetometer (Magnetic), also known as geomagnetic meter, magnetic sensor, can be used to test the strength and direction of the magnetic field, the principle of the magnetometer is similar to the principle of the compass, you can measure the angle of the current device and the four directions of the south-east and northwest.

4, ambient light sensor

Ambient light sensor can sense the intensity of the surrounding light. For example, in mobile applications such as cell phones, laptops, and tablet PCs, it can realize automatic adjustment of backlight brightness, etc. according to the brightness of the outside world, thus reducing the power consumption of the product.

5, proximity light sensor

Proximity light sensor is used to detect infrared signals, its main detection is the signal of the external infrared LED. This LED emits infrared rays outward, and when an object approaches the top of the sensor, it enters the infrared emission region, and some infrared rays are emitted back to the sensor. Now there are also laser-based proximity light sensors, such as ToF sensor, etc., which can measure distance in the range of about 2-4 meters.

6, barometer sensor

Barometer is mainly by a vacuum box type barometric pressure sensor, rely on the air pressure caused by the vacuum box deformation, the upper and lower two capacitive plate distance change, capacitance change to measure the atmospheric pressure value.

7, hygrometer sensor

The main principle is the temperature and humidity in the air through a certain detection device, after measuring the temperature and humidity, according to a certain rule of thumb, transformed into electrical signals or other required forms of information output, so as to detect the temperature value at that time.

8, ultraviolet sensors

Ultraviolet sensors (UV) is the use of photosensitive components will be converted into an ultraviolet signal electrical signal sensor.

9, PM2.5 sensor

PM2.5 laser sensor is a general-purpose fine particulate matter concentration sensor, using laser scattering principle. That is to make the laser irradiation in the air on the suspended particles to produce scattering, at the same time in a particular angle with a detector to receive the scattered light, the resulting photoelectric flow through the amplification of the electrical signal and the particles of the corresponding curve, after a series of algorithms to derive the mass of particles of different sizes in the unit volume. The PM2.5 sensor is mainly used to embed a variety of fine particulate matter concentration related instrumentation, environmental improvement equipment, such as air purifiers.

Smart Sensor Hardware Framework

Based on different terminal devices and business scenarios, the current sensor hardware framework can be divided into three main types, MCU built-in type, MCU external type and MCU independent type.

1, MCU built-in type

2, MCU external type

3, MCU independent type

This hardware program is mainly used for a variety of smart hardware devices, such as smart bracelets, sweeping robots and so on.

sensor suppliers

Accelerometer acceleration sensor: the main suppliers are ST, Bosch, Freescale, ADI, Meixin and so on.

Gyro Sensor Angular Velocity Sensor: The main suppliers are Invensesne, ST, Bosch, Panasonic, etc.

Gyro Sensor is the most popular sensor in the market.

Geomagnetic Sensor: The main suppliers are AKM, Yamaha, ST, QST, Aisheng, etc.

Barrier Sensor: AKM, Yamaha, QST, Aisheng, etc.

Barometer: Bosch, Sensata, Infineon, Denso and so on.

eg:

Fingerprint Identification: AS608, ATK-301

Barometer: bosch_bmp180, bmp280, bmp380

Temperature and Humidity Sensor: DHT11

Temperature Sensor: DS18B20

Dust Sensor: GP2Y

Infrared Recognition: HC-SR501

Magnetic Field Sensor: HMC5883L

Posture Sensor (6-axis): MPU6050

Gesture Recognition: PAJ7620

Laser Distance Measurement: VL53L0X

LDR Light Sensor

Three-in-one Light Sensor ：AP3216C

Laser Ranging：VL53L0X

Optical Flow：PMW3901

Angle Sensor：IMU901

Acceleration Gyroscope 2-in-1：lsm6dsm, lsm6ds3, lsm6dso, lis2hh12, lis3dh, icm20600, icm20608, icm20645, icm40605, bmi160, bmi2xy

Light sensor/proximity sensor 2-in-1: vc36658, tmd2750, tcs3701, bu27030, cm36558

Magnetometer: akm09918, mmc5603

sar sensor: sx9310, adux1050

General sensor suppliers will provide drivers, you can reserve the I2C and SPI interfaces in the MCU or SOC.

This site only provides storage services, all content is published by users, if you find harmful or infringing content, please click to report.

Expand the rest of this post

Open the app to read the full article and save it permanently