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Magnetometers

Magnometr - to determine the coordinates and orientation of the object, often used the device sensor. These include devices such as gyroscopes, accelerometers and magnetometers. Despite this, the area of application, each of them measuring the other quantities. Combining them into a single device, you get a powerful tool to determine the location and direction of movement, for example, a drone or robot. Accordingly, the developed electronic system that performs these functions you will find in numerous options, the store Botland.

What is a magnetometer and how it works?

Among the MEMS sensors are contained in the range of Botland store, you will find devices with built-in gyroscope, accelerometer, and magnetometrem - a device designed to measure magnetic field strength, mainly on the principle of Hall effect or phenomenon magnetorezystancji. In magnetometrze Hall, if the metal plates connect the voltage source to cause the flow of electric current between the two surfaces of this plate. If the plate fed by a constant voltage, let the magnetic field source (e.g. magnet), we distortion of the path of electron flow on the surface of the disk. In that case, one side of the plate is the electrons and other protons. When you connect the voltmeter between both surfaces of the disk, we could read voltage, the value of which depends on the magnetic field and its direction of interaction in space. And the concept magnetorezystancyjna magnetometer uses materials sensitive to a magnetic field – common alloy of iron and Nickel. These materials under the influence of the magnetic field change the resistance. MEMS sensors are available in our offer, in addition, they are equipped with I2C interface, with which no problems you can connect your magnetometer to work with e.g. Arduino or Raspberry Pi.

Magnometr in the phone - MEMS Gyro - compact and practical

If you want to expand the project of the robot on the presence of equilibrium stability during the stop, the movement or standing on an uneven surface, then a great solution is the use of a small gyroscope MEMS, which, by measuring the angular deviation of the robot from the equilibrium position, provide information to the Arduino that is controlling the appropriate motors and serwomechanizmami, will give the correct position of the robot to prevent it from unwanted tilting. And how the angular velocity measured by gyroscope MEMS? Sensor built in these devices has a size not exceeding the diameter of a human hair and is based on the phenomenon of mechanical resonance. When the gyro rotates, the MEMS sensor converts this motion into a voltage signal with a very low level, depending on the rotation angle. Then, this signal is amplified and transmitted to the microcontroller where the program takes further decisions depending on the measured voltage level.

The accelerometer is a simple measurement of acceleration

Accelerometers are devices which measure acceleration are the values that describe how rapidly changing the speed of the object in time. Accelerometers are useful tools in measuring systems for detecting vibration of the investigated object, as well as in navigation systems. The accelerometer determines the static and dynamic effects of acceleration. Static forces include the gravitational interaction, and the dynamic – vibration and movement. Accelerometers can measure acceleration in one, two, or three axes of the coordinate system, but, as in the case of gyroscopes, a triaxial solution is best. In the construction of a typical accelerometer consists of microscopic electrodes, forming a capacitor hung on springs. Under acceleration, the electrodes move relative to each other, changing the capacity between the speed of these changes allows the determination of the acceleration of the object on which the accelerometer operates. There are also piezoelectric accelerometers, where the material is influenced by mechanical stress, generates an electric charge on its surface – this phenomenon is used in particular when measuring seismic.