What stages can the development of the sensor network be divided into?
The measurement and control system consisting of traditional sensors with simple point-to-point signal transmission function is called the first generation sensor network; the second generation is the measurement and control network composed of intelligent sensors and field control stations; the third generation is the intelligent sensor network based on Fieldbus. Wireless sensor networks are the fourth generation of sensor networks.
What are the types of node deployment algorithms based on deployment methods?
Depending on the deployment method, the node deployment algorithm can be divided into two categories: deterministic deployment and random deployment. The solution is proposed for the optimization of network performance or cost; while the random deployment is more suitable for the monitoring environment with the harsh climate or artificial inaccessibility, the sensor nodes are usually randomly distributed in the target area in a throwing manner, and the node position is often unable to determine. However, the coverage performance of the target area cannot be guaranteed.
What is a long-term short-term?
The long line refers to the ratio of the geometric length of the transmission line and the wavelength of the electromagnetic wave transmitted on the line (ie, the electrical length) is greater than or close to 1; otherwise, it is called the short line.
What is the principle of chip inductance?
Chip inductors, also known as surface mount inductors, are the next generation of leadless or short lead microelectronic components for surface mount technology (SMT), like other chip components (SMC and SMD).
The welding faces of the leading ends are on the same plane. Chip inductors are mainly available in both wound and stacked versions.
Current status and development trend of chip inductors because micro inductors have to achieve sufficient inductance and quality factor (Q), and because the circuit and magnetic circuit are intertwined in the magnetic component, the manufacturing process is more complicated, so it is the basis of three foundations.
The inductor of one of the passive components is chipped, significantly behind the capacitor and Resistors.
In 977, Japan’s Matsushita Corporation first adopted SMT and SMC and SMD processes in consumer electronics such as ultra-thin semiconductor radios.
In the late 1970s, countries such as Japan and the United States began to research and development of chip inductors to meet the needs of SMT and soon realized industrialization.
What control functions can the CAN bus data acquisition communication node software design implement?
- When the air quality in the car drops, C0, C02: When the standard exceeds the standard, all the windows are automatically opened for ventilation to improve safety;
- When the vehicle speed is higher than the set value, the door lock is automatically locked to improve safety;
- When the air conditioner in the car is turned on, all the windows are automatically closed to improve comfort;
- When the temperature inside the car is lower than the set value.
There are several network structures for the networking of ZigBee networks?
The networking mode of the ZigBee network has three network structures: star, cluster, and mesh.
What are the reasons for the pipeline freezing?
Wait state; the condition of the instruction cannot be obtained.
In what ways can a Nios ll-based system help users achieve a long product lifecycle goal?
- Accelerate time to market
- Establish competitive advantages
- Extend product survival time
What is the purpose of conflict prevention?
The purpose of the anti-collision series (processing of the operational flow) is to count out the VICC, and the result of the inventory is to derive multiple VICC unique identification codes in the VCD workplace. The VCD initiates communication with the card by issuing an inventory command.
What is the purpose of the wake-up timer?
The purpose of the wake-up timer is to ensure that the circuitry required by the oscillator and chip has enough time to get it to work properly (such as Flash memory) before the processor begins executing instructions.
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