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With the continuous progress of science and technology, smart devices such as smart luggage, smart robots, smart followers and other smart devices have gradually become important tools in people's lives. The intelligent functions of these devices cannot be separated from the support of PCBA (Printed Circuit Board Assembly). The following are the application scenarios of PCBA in these smart devices, combined with Google industry hotspots and user interest points for elaboration.

- Automatic Following and Intelligent Locking: PCBA enables smart luggage to automatically follow the user and lock automatically when the luggage is detected to be out of the security range set by the user to prevent theft.
- Location and Tracking: The built-in GPS chip enables the suitcase to have a location function, and users can view the real-time location of the suitcase through the mobile app to ensure the safety of the luggage.
- Intelligent Weighing: The weighing sensor inside the suitcase is connected to the PCBA, which can accurately measure the weight of the luggage to avoid extra costs due to overweight.
- USB charging interface: PCBA provides USB charging interface for the luggage, which is convenient for users to charge their cell phones, tablets and other electronic devices during the trip.
- Fingerprint unlocking and security protection: through fingerprint identification technology, PCBA realizes quick unlocking and security protection of the luggage, only authorized users can open the luggage.
- Intelligent Reminder & Notification: PCBA can be connected with cell phone application to send timely reminder notification to the user when the suitcase detects abnormal conditions (e.g. vibration, impact, etc.).

- Automatic following and navigation: PCBA realizes the automatic following function of the intelligent robot through sensors and microcontrollers, which can recognize the user's movement and position, and adjust the direction and speed automatically.
- Obstacle Detection and Avoidance: Using ultrasonic or infrared sensors, PCBA can monitor the environment around the robot in real time, issue timely alarms when detecting obstacles and automatically adjust the path to avoid collision.
- Intelligent control: PCBA supports remote control of the robot through cell phone applications, users can use their cell phones to send commands to control the movement and operation of the robot.
- Multi-sensor fusion: PCBA integrates a variety of sensors such as accelerometers, gyroscopes and magnetometers to provide precise motion control and environment sensing capabilities.

- Automatic Following Function: PCBA realizes the automatic following function of the Smart Following Vehicle through wireless positioning technology. Users only need to carry a bracelet or handheld terminal, and the following car can automatically follow the user's movement.
- Anti-collision and anti-fall: The built-in ultrasonic and infrared sensors of PCBA can detect obstacles and the distance to the ground to ensure that the following car will not collide or fall down during the moving process.
- Motion Control: PCBA controls the motion of the motor to realize the functions of forward, backward, turning and stopping to ensure the stability and safety of the following car.
- Voice broadcasting and voice control function: PCBA supports voice broadcasting and voice control function, users can control the operation of the following car by voice command.

- Electrical performance: Reasonable planning of power and ground alignment to avoid interference and noise. Pay attention to signal integrity to ensure the quality of high-speed signal transmission. Correctly set the bypass capacitors and decoupling capacitors to improve circuit stability.
- Thermal design: For components that generate a lot of heat, arrange the location reasonably to ensure good heat dissipation. Consider the thermal conductivity of the PCB to avoid localized overheating.
- Mechanical structure: Ensure that the PCB size and shape meet the product requirements and are easy to install and use. Consider the installation method and space requirement of components to avoid interference.
- Manufacturability: Follow the requirements of the PCB manufacturing process to avoid unreasonable design leading to production difficulties. Pay attention to the selection of PCB board thickness, aperture and other parameters.
- Reliability: Select reliable quality components to reduce the risk of failure. Conduct environmental adaptability tests to ensure that the product can operate reliably under various conditions.
- Maintainability: Consider the convenience of maintenance when designing, easy to replace components and carry out fault diagnosis. Reasonably set up test points and markings to facilitate the operation of maintenance personnel.
- Cost and environmental protection: On the premise of meeting the performance requirements, minimize the material cost and processing cost. Optimize the design to reduce unnecessary components and process steps. Select materials and processes that meet environmental standards to reduce the impact on the environment.