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FDC2112: How to implement an FPC capacitive sensor on the surface of an robotic arm which made of matal?

user6344594
Prodigy 10 points
Part Number: FDC2112

Hi,

We want to implement a collision warning function on a 6-axis collaborative robot, which can be automatic stop when approaching people. 

We want to build some capacitive sensors on FPC and attach it to the surface of the robotic arm. The question is, since the arm is made of metal, the sensor can detect it, how to shield the metal influence? 

Maybe some insulation are needed but we don't want it too thick for appearance concern. 

  • 0
    TI__Expert 7599 points

    Hello User,

    Thanks for posting your question on the forum. Yes, you are right capacitive sensors are sensitive to metal and non metal objects. Depending on how the coil is designed and the sensor is placed you could get away with shielding the metallic portion of the robotic arm. For collision warning and object detection for robotics I highly recommend ultrasonic sensing solution using our modules. http://www.ti.com/tool/PGA460PSM-EVM Capacitive solution may be too sensitive and unreliable for your application.