Once you have learned the principle of the working of the any sensor you can use it any way you want.
So this is the way the flex sensor works. The variation of the voltage level can then easily be read on the analog pin of the Arduino microcontroller development board. So if the resistance of the Flex sensor varies with the amount of the bending the voltage drop as governed by the voltage divider equation varies across the 1 kilo resistor and the flex sensor itself. As can be seen in the figure that the Flex sensor is connected to the 1 kilo ohm resistor in voltage divider configuration. Now let us understand the working of the above circuit. The circuit for reading the change in voltage as a result of the change in resistance is shown in the figure below: Also notice that the Flex sensor is the analog sensor so in order to measure the change in resistance corresponding to the amount that the flex sensor is bent, we need a simple voltage divider circuit. So we can say that the Flex sensor is basically the variable resistor whose resistance depends upon the amount of bend. As we have learned in the previous discussion that the Flex sensor measures the bending or the stress applied in that way by altering its resistance correspondingly. Let us now see how the Flex sensor can be used in the circuit. It is not a rule of thumb to connect the pins as shown in the figure above: You can alternately connect the each pin to either voltage supply or ground. Notice in the above figure that the Flex sensor has only two pins. The flex sensor looks like the one in the following figure: So you can say that flex sensor measures the amount of force or bending angle by exploiting the change in its resistance. The more the sensor is bent the more will be change in resistance. The flex sensor measures the amount of stress that is applied on the sensor while it is being bent that is when the flex sensor is made to bent the resistive film present inside the flex changes its resistance due to the mechanical stress that is applied to it while being bent.
The flex sensor like most of the sensors measures the physical quantity but do so in the unique way. Before diving deep into the discussion on the simulation of the flex sensor in the Proteus let us first learn what the flex sensor is and how it works.
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