Thermistors: Their resistance changes with temperature; Therefore, it is very suitable for fairly accurate temperature measurement.

Thermocouples: Due to the proportional temperature difference, they generate output voltage. They are used in industry to control processes.

Piezoelectric sensor: an electrical signal that converts pressure, force, or strain into piezoelectric effect.

Capacitive sensors: These sensors measure changes in capacitance caused by diaphragm movement or deformation. They can be used in consumer electronics and automotive systems.

Accelerometer: Measuring the acceleration force that helps determine the direction of a smartphone.

Gyroscope: The main component that assists in sensing rotational motion and direction, and is very important in land-based vehicle navigation systems and drones.

Photodiode: converts light into current, mainly used for measuring light intensity.

Phototransistor: With higher sensitivity, it is used for precision light detection, such as in safety equipment and automatic lighting.

Capacitive humidity sensors: Due to changes in the capacitance value of polymer films, they can sense humidity.

Resistance humidity sensors: These sensing elements use the resistance between conductive polymers to detect changes in humidity.

PCB sensors have many sensors, making them very flexible and applicable in various fields from household appliances to heavy industrial machinery. The development of sensors integrated onto PCBs has made modern electronic product designs more compact and functional, highlighting the core value of this advanced technology as a stepping stone.

The design of PCB sensors requires careful attention to multiple factors to ensure reliable operation of the PCB under different application conditions. One of the environmental conditions is significant changes in temperature, humidity, and various chemical substances.

For example, sensor PCBs used in outdoor environments must be able to resist moisture and significant temperature changes. In contrast, sensor PCBs used in industrial equipment may be affected by vibration and mechanical stress.

Application specificity is crucial for defining design; For example, medical device PCBs must comply with many safety and accuracy regulatory standards, while consumer electronics products focus on compactness and cost-effectiveness.

Material selection is an essential part of the reliability and performance of sensor PCBs. Common materials include:

FR4： This is a universal type of composite material that typically has good electrical insulation and heat resistance properties.

Continuity Management 1: Compared to cheaper FR4, it has excellent mechanical properties and heat resistance, making it suitable for cost sensitive applications.

High frequency materials: Rogers or Teflon are high-frequency materials used for high-speed signal transmission.

These layout considerations can enhance the effectiveness of sensors and the integrity of signals. The wiring of the filter circuit should make the end-to-end cable length as short and direct as possible to prevent a decrease in signal strength over long distances.

The PCB sensor board is the most accurate part of the system, involving multiple processes aimed at ensuring accuracy and high-resolution output. Let's delve deeper into the main operations:

1. Schematic design and layout preparation: Now, the designer needs to start drawing schematic diagrams, marking all element connection points and the functional conditions of these elements.

2. Material selection and stacking: Typically, material layers are stacked together; In this case, the stacked structure will include a copper conductive layer and a substrate used as an insulation layer, which are the basic elements that make up the sensor PCB.

3. Lithography: First, apply an appropriate photoresist on the substrate. Next, the circuit is first imprinted into the polymer through gentle ultraviolet irradiation. Then remove the uncovered structure, leaving only the remaining copper traces.

4. Layering and lamination: This process requires mixing several layers of cover with other insulation materials at high temperature and high pressure to bond all layers together through a single solid board.

5. Drilling and Electroplating: The installation position and via holes of through-hole components are pre created and drilled in the design based on precise design. The internal layers of the device from top to bottom are coated with copper, which helps to form conductive channels.

6. Component placement and welding: After this step, the assembled components are placed by an automatic machine using two main methods:

SMT components are placed on the surface of the sensor PCB. This means that the setup can be very compact, making efficient use of performance and space.

This method is the same as drilling and welding all components from the other side, using resin of the same size and strength to achieve strong bonding for high-pressure applications.

7. Inspection and Quality Control: This program utilizes AOI (Automatic Optical Inspection) and X-ray testing during and after welding to confirm the accuracy of component placement and the quality of circuit board joints.

8. Functional testing: Functional testing is an electrical simulation of the working status of the sensor PCB. The purpose is to check the integrity of the circuit by verifying open circuit, short circuit, and resistance values.

9. Precision machining and cutting: Now apply a protective coating on the sensor PCB and cut it into individual units.

During these stages, quality control is very strict: the program includes online testing (ICT) and environmental stress testing, allowing us to ensure that the sensor PCB meets very qualitative requirements such as performance and durability. These processes aim to serve as guiding principles for the production of high-quality and reliable sensor PCB boards.

Sensor PCB boards now play an important role in the technological deployment of new and old industries. There are many opportunities for new applications, and many development fields are also open. The future is welcomed in research and development, which will bring more innovation as various integrated technologies, miniaturization, and materials will help improve performance and stimulate the development of new applications in emerging technologies. Some applications of sensors are as follows.

Smartphones or wearable devices include sensor circuit boards to provide motion sensor functionality and health monitoring, enabling further user interaction and providing real-time health data functionality.

In industrial environments, they strive to improve efficiency and achieve extremely high levels of safety. They are applied to automation sensors for controlling processes and safety monitors for detecting hazardous situations; Therefore, the operation is safe.

The sensor PCB in safety systems such as collision detection and parking sensors contributes to the development of automotive safety, helps prevent accidents or disasters while driving, and guides better driving techniques.

These applications fully demonstrate the role of PCB sensors in improving current technology, enhancing efficiency and safety, and providing better benefits for numerous different groups

Due to strict space constraints, the design and manufacturing process of sensor PCB is very complex.

This will result in thermal load, which in turn requires complex thermal management.

Signal Integration and Signal Interference

The integration of different sensors may cause signal interference.

We must establish complex data layouts and shielding to protect data from potential distortions.

The PCB sensor board must be durable enough to withstand various harsh environmental factors.

It results in the use of durable materials and resistance to water, heat, and mechanical damage.

If pursuing cost-effective FPC manufacturing services, choosing a Chinese manufacturer is the best choice. As a manufacturing powerhouse, China has abundant resources, cheap labor, and a large number of technical personnel. We recommend Haibo, a Chinese FPC assembly service provider with over 10 years of experience, who has performed outstandingly in various aspects

Efficient and reasonable quotation:There is an efficient quotation process to assist you in making decisions, providing reasonable prices and highly competitive quotes in China.
High quality and reliable products:Produce high standard printed circuit boards, manufacture and test according to specifications, international standards, and internal controls, and conduct pre production inspections to ensure robust processes.
Quick and on-time delivery:The assembly equipment is in good condition, with high productivity, minimal downtime, short delivery time, and also provides urgent services.
Timely and effective response:Always respond to customer needs, provide accurate information, answer questions through multiple channels, and offer one-stop services.
Strong technical strength:China's FPC manufacturing technology is leading, and Haibo has a complete SMT solution that covers assembly, inspection, and other capabilities. It also provides prototype production and customization services.