How do you need to connect an external circuit to an accelerometer as a probe 20

Maximon's first choice for accelerometersIn the industrial sensor industry, which is dominated by electrical sensors, it has developed a "precision mechanical sensor" that has no precedent in the world. It can perform high precision even in harsh environments with coolant and chip splashing, and has more than 50 domestic and foreign patents with a high degree of originality. In the machine tool industry, the "tool setter" for detecting tool tip wear has been used by more than 81 machine tool manufacturers in 17 countries around the world, and has an excellent market share in the world.

It contributes to improving the accuracy and reducing costs of various industrial machinery, such as automobiles, machine tools, semiconductors, robots, medical devices, and smartphone manufacturing. By not imitating the product development of other companies, it supports global production in obscurity.

The working principle of the intelligent accelerometer is: the sensitive element converts the acceleration signal of the measurement point into the corresponding electrical signal, enters the pre-amplification circuit, improves the signal-to-noise ratio of the signal through the signal conditioning circuit, and then converts the analog-to-digital to obtain the digital signal, and finally sends it to the computer, and the computer then stores and displays the data.

When the sensing element moves with acceleration a, the mass is subjected to an inertial force opposite to the direction of acceleration, and a deformation proportional to the acceleration a occurs, so that the cantilever beam also generates stress and strain. This deformation is felt by the diffusion resistance affixed to the cantilever beam. According to the piezoresistive effect of silicon, the resistance of the diffusion resistance changes in proportion to the strain, and the acceleration can be measured by measuring the change in the output voltage of the bridge by using this resistance as an arm of the bridge [1].

Haha, according to the principle of physical acceleration. An accelerometer is actually a sliding rheostat. A spring-loaded sliding rheostat.

According to f=, the larger the f, the larger the f. The greater the distance traveled, the greater the change in resistance, the greater the voltage convenience, and the greater the displayed value.

Accelerometers can only measure acceleration, not velocity.

In addition, the most commonly used accelerometer is not a sliding rheostat structure, and most of the core sensitive components are piezoelectric materials or semiconductor materials.

What signal is output by the acceleration sensor, the capture card can collect this signal to collect data.

Divide the sampling period, say 50 ms, measure the acceleration once during this period, and then calculate the total displacement and end velocity for the first 50 ms based on the previously accumulated velocity (including velocity and direction) and position. The result can be obtained by repeating the calculations in this way.

The accelerometer is used to measure the principle and calculation method of displacement in the dynamometer, and this algorithm can realize the dynamic zero correction of acceleration and determine the integral boundary condition, and the various factors affecting the accuracy of displacement measurement are quantitatively analyzed, and the test results show that this measurement method is effective!

Accumulate 2 points for reference to prosig's blog.

1. Use a multimeter to detect the sensor voltage, and under normal circumstances, the voltage range is in the range of 0.1 to 2.00 points, and the voltage is perpendicular to the axis.

2. Then use the variable power supply to connect to the AD conversion port of the single-chip microcomputer, adjust the power supply voltage to see if the AD display and voltmeter detection are normal. (The variable power supply can be led out with a sliding rheostat common glue, and the two ends are grounded and positive respectively).

3. Connect the circuit, pay attention to the single-chip microcomputer and the sensor must be on the same ground.

Because I didn't see your physical object, I can't say it. I also suspect that there may be something wrong with the hardware.

It is recommended to check whether the power supply on the development board is normal, and if you use 5V, is there any other place where the port connected to the sensor and ADC is connected, and the voltage of the port is forcibly pulled up? Look at the jumper on the development board or something, do you jump wrong?

Depending on the type of sensor, the measurement circuitry of piezoelectric sensors and piezoresistive sensors is different, especially the front amplification.