The choice of accelerometers – Beggar

Create Date: 2024-8-30 12:03:23|Source: P+F/Double Blessing

1. Analog output or digital output:

The first thing to pay attention to is the case of the analog and digital outputs, which is important because it is the interface between the system and the sensor. In general, the voltage of the analog output is proportional to the acceleration. For digital outputs, a pulse-width modulated signal or a general-purpose serial port (SPI or I2C) is typically used. If you use a microcontroller with an analog input port, you can easily use an accelerometer with an analog interface. If you use a microcontroller with only digital inputs, you can only use accelerometers with digital outputs.

2. Sensitivity:

Generally speaking, the higher the sensitivity of the sensor, the better, because the sensor with high sensitivity is more likely to sense changes in the surrounding acceleration, so the change in output voltage is correspondingly greater, so it is easier and simpler to measure, and the measurement results tend to be more accurate. But in fact, the higher the sensitivity of the sensor, the narrower the measurement range. Conversely, a wide measurement range can be obtained with low sensitivity. Therefore, when choosing a sensor, we should start from the actual needs.

The choice of accelerometers – Beggar

3. In terms of maximum measured values:

Maximum measured value. For measuring the acceleration of different objects, the maximum measurement value of the required sensor is different, depending on the situation. Choose a reasonable maximum measurement value and the measurement data will have a better effect.

4. Bandwidth: The bandwidth mentioned here refers to the brushing frequency, which refers to how many effective readings the sensor can produce per second. The bandwidth required for measuring different accelerations is also different, depending on the specific use occasion and the purpose and nature of the work you are purchasing.

5. In terms of resistance:

In terms of resistance, some microcontrollers require A/D conversion, and the output resistance of the connected accelerometer must be no greater than 10 kΩ, while some accelerometers have a resistance of 32,000 Ω, which cannot be used directly in some places. Therefore, when buying, be sure to read the instructions clearly. This resistance value must be clearly known.

6. Number of measuring axes:

The number of measuring axes required varies from project to project. As with ROV control, three axes are more suitable. In general applications, two axes are sufficient. This also needs to be selected according to the specific application.

In addition, consider the environment in which the accelerometer will be used. For example, vehicles, marine, aerospace and general industrial applications have different requirements for temperature and humidity, stability and salt spray resistance, which need to be selected according to their application environment.

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