Force feedback technology is the core of human-computer interaction for collaborative robots, and the PCB sensor interface is the key link to realize force signal collection, transmission, and conversion. Collaborative robots need to perceive external contact force, collision force, and operating load in real time to achieve flexible docking, obstacle avoidance, and compliant control. The PCB sensor interface design must ensure high precision, high real-time performance, and strong anti-interference ability to accurately capture weak force sensor signals in complex industrial electromagnetic environments.

The PCB interface adopts a dedicated differential signal acquisition design, matching with strain-type force sensors and torque sensors commonly used in collaborative robots. The interface circuit integrates high-precision signal conditioning chips, which amplify the millivolt-level weak force signal output by the sensor and filter out high-frequency electromagnetic interference. The PCB layout strictly follows differential line routing specifications, equalizes the length and spacing of differential lines, and reduces signal crosstalk and common-mode interference, ensuring the integrity of force signal transmission. Meanwhile, independent power supply and ground isolation design are adopted for the sensor interface area to avoid power supply noise affecting acquisition accuracy.

In addition to signal acquisition, the PCB interface reserves temperature compensation and zero calibration circuits to eliminate signal drift caused by temperature changes and sensor zero offset, improving the long-term stability of force feedback. The interface is also equipped with over-voltage and static protection devices to prevent sensor damage and signal abnormality caused by external static electricity and voltage surges. The optimized PCB interface design enables the collaborative robot to realize millisecond-level force response and high-precision force perception, ensuring safe and flexible human-computer collaborative operation.