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Introduction
A force sensing resistor (FSR) is an active component commonly used in many electronics and robotics projects. An FSR is a component with a resistive material that changes its value based on the amount of pressure applied to it. FSRs are made of rubber, so when pressure is applied its resistance decreases, and when the pressure is released, its resistance returns back to its original state. The resistance of an FSR depends on the pressure applied, so it can be used to sense any amount of pressure, force, or weight put on it.
Features
One of the main features of a force sensing resistor is its simplicity and versatility. Unlike other types of force sensors, such as piezo sensors or strain gauges, FSRs are relatively inexpensive and require minimal setup. FSRs are also easy to install and use, making them ideal for both hobbyists and industrial settings.
Another benefit of using FSRs is their ability to detect very low-level forces, with the ability to detect as low as 10 grams of pressure. In addition, FSRs can detect both static and dynamic changes in force. This makes them suitable for a wide range of applications that require the detection of very small changes in force, such as touchscreens and robotic sensing.
Applications
FSRs can be used in many applications and industries, such as robotics, automotive systems, industrial and consumer electronics, biomedical systems, printing presses, and sports equipment.
Robotics: FSRs can be used in robotics to sense and measure forces such as weight, pressure, and acceleration. They are often used in humanoid robots and robotic arms to detect where the body part is and when the robot needs to take an action.
Automotive systems: FSRs are used in automotive systems to detect pressure changes in the brakes, and can be used to measure force applied by the driver on the accelerator or brake pedals. They can also be used to detect a variety of other forces such as cornering forces and tire axial loads, and are often used as part of an anti-lock braking system (ABS).
Consumer electronics: FSRs are used in a variety of consumer electronics, from phones to game controllers. They are used in phones to detect when the user is pressing down on the screen, and in game controllers to track the movement of the joystick.
Biomedical systems: FSRs can be used in biomedical systems to measure the pressure of a patients pulse and respiration. They are also used in prosthetic limbs and exoskeleton suits to track the forces applied by the wearer.
Printing presses: FSRs are used in printing presses to detect and measure the forces needed to push and pull the printing plate, as well as the contact area between the plate and paper.
Sports equipment: FSRs are used to measure force applied by the user on sports equipment such as skis and boards, snowboards, and climbing tools. They can also be used to measure the tension in strings on a variety of different sports equipment.
Conclusion
Force sensing resistors are simple, inexpensive, and versatile active components that are suitable for a wide range of applications. They can detect very small changes in pressure, making them useful for robotics, automotive systems, consumer electronics, biomedical systems, printing presses, and sports equipment. FSRs are also relatively easy to install and use, making them ideal for hobbyist and industrial settings alike.
