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recent research shows that in a laptop, the battery power consumed by display backlights accounts for 33%.
Sensing ambient light is not a new concept, but unlike photosensitive diodes, sensor sensing of ambient light can reduce excess infrared light and ultraviolet light while sensing ambient light, moreover, these fe
) sensor, rotation vector (rotational vector) sensorLet's look at the coordinates of the sensor world:
The coordinate system of the sensor world
is not already feeling a bit.
(2) Environmental sensors
Such sensors can measure parameters in different environments, such as ambient air
TYPE_RELATIVE_HUMIDITY = 12;/*** get the constant of the temperature sensor: Disable public static final int TYPE_TEMPERATURE = 7; */public static final int TYPE_AMBIENT_TEMPERATURE = 13;
Interpretation of sensor event values in Android devices
The acceleration sensor, als
Measure the ambient temperature around the chip. The output voltage of the temperature sensor is proportional to the temperature. The obtained temperature is measured by ADC.
Inside the chip, the
The instructor of the fetc project proposed a new requirement. He wanted to show the user's current movement direction in the game map. If he used GPS, it was obviously unreliable, so he thought of the powerful Android sensor...
Many mobile devices have built-in sensors. Android abstracts these sensors through the sensor
The instructor of the fetc project proposed a new requirement. He wanted to show the user's current movement direction in the game map. If he used GPS, it was obviously unreliable, so he thought of the powerful Android sensor...
Many mobile devices have built-in sensors. Android abstracts these sensors through the sensor
follows:
SensorManager. SENSOR_DELAY_FASTEST:The fastest, with the lowest latency. This frequency is recommended only for applications that are particularly dependent on sensor data.
SensorManager. SENSOR_DELAY_GAME:Suitable for games. This frequency is suitable for general practical applications.
SensorManager. SENSOR_DELAY_NORMAL:Normal Frequency. Generally, applications with low real-time requirements are suitable for use.
SensorManager. SENSOR_DE
This article describes how to obtain a list of sensors supported by your Android device.Currently, Android 4.4 (API level 19) supports the following sensors:Type_accelerometer Accelerometer, Unit m/s2, measurement of the accelerometer type values (sensors type) applied to the device x, Y, Z axes: 1 (0x00000001) Type_ambient_ Temperature
light intensity, the unit of light is lux, and its physical meaning is luminous flux on the unit area.The light sensor is mainly used for the LCD auto-brightness function of Android system.The brightness of the LCD can be adjusted in real time according to the light intensity sampled.1-6 Pressure sensorThe pressure sensor returns the current pressure in the unit
Android environment sensor and android Sensor
Environment Sensor
The Android platform provides four sensors for detecting different external environments. We can use these sensors to detect the surroundings. For example, it can de
.sensor.type_light: Light sensorValues[0]: Ambient light level lux unit value. 5.sensor.type_pressure: Pressure sensorValues[0]: Atmospheric pressure value, unit kpa. 6.sensor.type_proximity: Proximity sensorValues[0]: The distance value in centimeters. 7.sensor.type_relative_humidity: Humidity SensorValues[0]: percentage of ambient air relative humidity. 8.sensor.type_temperature:
("Cat/sys/class/net/wlan0/address"); InputStreamReader ir=NewInputStreamReader (Pp.getinputstream ()); LineNumberReader input=NewLineNumberReader (IR); for(;NULL!=str;) {STR=Input.readline (); if(str! =NULL) {macserial= Str.trim ();//Go to Space Break; } } } Catch(IOException ex) {//give default valuesEx.printstacktrace (); } returnmacserial; }Third, get all the sensors inside the device: The sensors included in the
sensors, gravity sensors, light sensors, gyroscope sensors and directional sensors. In addition to these sensors, the Android SDK also supports several of the following sensors. Readers can refer to the official documentation for the use of these sensors and the constants and methods associated with these sensors.
Proximity sensor (sensor.type_proximity)
Linear acceleration
direct the device's normal direction to all eight quadrants of the space as much as possible.
The gyroscope sensor, called Gyro-sensor, returns the angular velocity data of x, y, and z axes.
The unit of the angular velocity is radians/second.
According to the Nexus S mobile phone test:
Rotate horizontally counterclockwise, And the Z axis is positive.
Rotate horizontally counterclockwise, And the Z axis is
Android sensor (details 2)-common Sensors
Direction sensor Orientation (now almost no longer needed, because there is actually no real direction) Magnetic Field Sensor Magnetic Field Temperature sensor
. Environment Sensors
These sensors measure environmental parameters such as ambient air temperature and pressure, illuminance and humidity. This type of sensor includes a barometer, spectrophotometer, and a thermometer.
3. Position Sensor
These sensors are used to measure the physical location of a device. This typ
Sensor overviewSensors are one of the important symbols of the second generation of smartphones. Many phones and tablets are now built-in with sensors (except TV). The Android SDK supports a number of more than 10 sensors, but the phone only supports a subset. such as the direction sensor (electronic compass) and the gravity
Gesture operation can be said to be a smart phone charm, the first two sections to explain the two interesting gestures, put them in the game, greatly enhance the game's playful and interesting. This section will continue to introduce another magical thing about smartphones: sensors.
first, what is the sensor
The so-called sensor is to be able to detect such as light, heat,
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