Did you ever listen to rezystor siły? It sounds complex but the reality is that it's a very neat little tool to actually give your device an idea how much force something being pressed with. However, this is a technology that we use every day in many applications and it seems very interesting to understand how it works.
A force sensitive resistor (FSR) is a unique type of sensor. The beauty of it is that when you press down on the top, its resistance changes. Resistance: This is a value used to quantify how hard it is for electricity to move through the material. This is because when the FSR is pushed harder, it has lower resistance. So then, if you wire this FSR up to a circuit you can measure the pressure by measuring changes in resistance. Having that little helper, even if it only tell you how hard you are pressing is easier than nothing.
When you push on the FSR its resistance will change. How much it changes resistance depends on how hard you press. The less hard you press the lesser will be the change and more harder changes a lot. The circuit can then sense this resistive change, and convert into a signal. This signal can then be read by the computer or device and therefore, it knows where you are pressing — hence being able to make that reaction.
Touchscreens: A variety of modern touchscreens, such as those in most smartphones and tablet computers use FSRs to determine where you are touching the screen. This is a great feature for things like drawing and games where the amount of pressure you use can effect how the screen reacts.
Other medical devices: FSRs are used in different other medical devices as well. They allow assessment of the strength (for instance, in a blood pressure finger) or how much force is applied during an examination. This is crucial information for a doctor to know about the health of their patient.
In the universe of robotics, FSRs are used to detect in particular if a robot collides with an object. It is how they get around and avoid running in to things, literally. This is what enables robots to move through their environment without unintentionally braking or breaking something.
Now, Connects the FSR to Resistor and Power: So for that take 1 wire connect one end of resistor with power pin on it. Next, connect the other end of the resistor connected to VCC via a wire to one terminal on your FSR and use another wire for connecting that goes from it second pin out (Signal) into our Arduino. It is a crucial step as the circuit now has to measure differences in resistance.
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