Description of Force Sensitive Resistor:
Force Sensitive Resistor FSR are basically a resistor that changes its resistive value (in ohms Ω) depending on its pressing. These sensors are fairly low cost, and easy to use but they’re rarely accurate. They also vary some from sensor to sensor perhaps 10%. So basically when you use FSRs you should only expect to get ranges of response. While FSRs can detect weight, they’re a bad choice for detecting exactly how many pounds of weight are on them.
How to measure force/pressure with an FSR
As , the FSR’s resistance changes as more pressure is applied. When there is no pressure, the sensor looks like an infinite resistor (open circuit), as the pressure increases, the resistance goes down. This graph indicates approximately the resistance of the sensor at different force measurements. (Note that force is not measured in grams and what they really mean is Newtons * 100!)
It is important to notice that the graph isn’t really linear (its a log/log graph) and that at especially low force measurements it quickly goes from infinite to 100KΩ
Applications
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Robotics (grip force detection)
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Touch-sensitive buttons
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Pressure pads and mats
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Musical instruments & MIDI controllers
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Wearable electronics
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Human–machine interfaces
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Educational and prototyping projects
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