Hardware

1. RS422 communication principle: (1) RS422 working mode: RS422 supports full-duplex communication mode, that is, data can be transmitted bidirectionally at the same time, that is, two pairs of differential lines are used for sending and receiving respectively, which improves the efficiency and flex...

If the communication between the sensor module and the user system is carried out using UART, SPI or IO methods, generally, the interface voltage level of the sensor module is 3.3V, and the voltage level of the user system is also 3.3V. Usually, a direct connection method is feasible. However, if th...

The voltage output type sensor typically outputs a voltage range of 0-5V or 0-10V. If we choose not to use an external ADC conversion chip due to cost considerations but instead sample the ADC module within the MCU chip, but as the voltage range of the AD acquisition in STM32 is 0-3.3V, in this case...

1. Working Principle and Types of Acceleration Sensors An acceleration sensor is a common type of sensor that can measure the acceleration and tilt angle of objects, and is widely used in industries, healthcare, sports, and other fields. Acceleration sensors typically consist of sensing elements, si...

The main reason for choosing dual power supplies for sensors is to meet the requirements of signal integrity, circuit operating conditions, and measurement accuracy. This includes the following aspects: 1. Handling bidirectional signals (AC signals) Some sensors (such as vibration, sound, and accele...

According to the topology of the two-wire circuit, the power current is modulated by the sensor and then returns to the signal acquisition circuit. If the power output part does not undergo any processing, once the sensor is short-circuited or the end user operates improperly causing a short circuit...

In order to prevent the power supply user from accidentally connecting the input power line incorrectly and causing the power supply to burn out, an anti-reverse connection circuit is generally required at the power supply input end. At the same time, in order to ensure that the input voltage is wit...

In order to prevent the power supply user from accidentally connecting the input power line incorrectly and causing the power supply to burn out, an anti-reverse connection circuit is generally required at the power supply input end. At the same time, in order to ensure that the input voltage is wit...

Power Supply Rejection Ratio (PSRR) refers to the ratio of the input ripple voltage to the output ripple voltage, in decibels (dB), and its expression is: The significance of PSRR lies in quantifying the degree of transmission of changes in the power input to the output. For example, if the PSRR of...

Load regulation refers to the change in output voltage when the load current is adjusted from a minimum value to a maximum value while the input voltage remains unchanged, that is, the ability to maintain a stable output voltage when the load current changes steadily. It is a steady-state indicator....

The resonant frequency of the accelerometer chip is a very important performance indicator, which is related to the operating frequency range of the sensor. 1. Definition of resonant frequency The accelerometer sensor itself is also a mechanical structure, so it also has a natural frequency. As show...