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FSR Cycle Tester

A test fixture that simulates repeated touching of a force sensing resistor

DESCRIPTION ​

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This is a device to test the lifespan and accuracy of a force sensing resistor which was going to be used in a non-moving button (like in the latest iPhone home button). Unfortunately the project was abandoned mid-way through due to changes in product feature requirements. 

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FEATURES​

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Solenoid with variable forcing speed and power using different springs and voltages

Arduino controller (for variable cycle speeds, lengths, and frequencies) and a power shield 

Miniature padded shaft coupling to connect Silicone tip to solenoid and damp recoil noise

3D printed tip made of Silicone (to simulate a finger) printed over a plastic shaft for attachment

Compact, high accuracy force gage, with multiple options

CAD EVOLUTION

CHALLENGES

LEARNINGS

  • Creating and attaching a conformable tip to simulate a finger

  • Getting a solenoid with the right force range

  • Finding affordable, small, and accurate force gage

  • Minimizing custom parts

  • Ensuring stability with minimal parts

  • Alignment flexibility 

  • Arduino programming 

  • Solenoid selection, operation, and electrical setup

  • Printing a multi-material part

  • Presenting multiple options to team

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