![]() ![]() Processing these sounds will produce the digital signals needed for the device and hence the system produces the output. Rather than detecting the sound, the sensor is used to detect the intensity of the sound produced. These changes are converted into electric signals. The plate is vibrated when the sound wave is detected and the distance between the moving plates is changed which helps to notice the changes in the capacitance. The sound signal is detected and converted into an electric signal with the help of microphone sensors. Both rotational and actual speed of the vehicle is measured with the help of speed sensors. Magnetic rotation speed is measured in the device and voltage is produced where this is applicable in the automotive and aeronautical engineering sectors. The speed of the drive wheels is detected and this information is sent to the engine control unit and the speed is managed so that the vehicle is running efficiently. It is the sensor used to measure the speed of the vehicle based on the wheel rotation of the vehicle. This sensor has to be inserted into the soil and the water content is reported in percentage level in the sensor. Hence, moisture in the soil can be verified. When we consider the soil, it has water content and dielectric permittivity is measured in the soil so that a voltage is created which is proportional to the permittivity of the water and this detects whether water is present in the soil. ![]() Soil Moisture SensorÄielectric permittivity is measured with the help of capacitance in the medium. Analog input is fed into the Arduino board and results are fetched from the sensors. The principle of photoconductivity is used in the sensor and the resistance of the sensor decreases with increasing light intensity in the device. The sensitivity of the resistors varies depending on the wavelength of the light being detected on the device. It also measures the light intensity and is called a light dependent resistor. Photoresistor SensorĪ light-sensitive sensor that helps in determining the presence of light in the device is called a photoresistor sensor. The presence of heat is detected from the flame and an alarm is triggered. These sensors are also called visual flame detectors. The flame is detected for two infrared frequencies and charge coupled device is used to analyze the fire. Any organic substances burning can also be detected with the help of flame IR sensors. This sensor is used to detect the spectral radiation of burning and water is produced as the result of burning and can be detected within the range of IR spectrum. ![]()
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