Flex Sensor Circuit Design

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Flex sensor circuit design.

It is a two terminal device and the terminals are like p1 p2. The circuit will be as below. Wiring harness space and weight reduction. So it is usually used to sense the changes in linearity.

Vo being output voltage and also the voltage across the flex sensor. As shown in figure r1 here is a constant resistance and flex sensor which acts as a variable resistance. A single flex circuit. So this sensor resistance increases depends on surface linearity.

Flex sensor are used to resistive carbon materials like a graphite. In essence flex circuits give you unlimited freedom of packaging geometry while retaining the precision density and repeatability of printed circuits. Flex circuits can be shaped to fit where no other design and round wire exhibiting benefits of each. The flex sensor also a variable resistor but the resistance of this sensor changes according to the bending flexing.

Flex sensor working details. In this flex sensor are many applications human machine interfaces and robotics medical automotive. Here the circuit constructed with arduino and. It contains carbon on a strip of plastic to act like a variable resistor.

In this tutorial we will learn how to make and use a flex sensor we will control servo motor with a flex sensor flex sensors are passive resistive devices that can be used to detect bending or flexing. Flex sensor is a completely linear it will be having its nominal resistance. A flex sensor has a range from about 10k to 35k that means it won t give us a full 0 5 volt range or 0 1023 analog value. Read analog value from flex sensor value analogread.

The pin configuration of the flex sensor is shown below. When the sensor is straight the particles give the ink a resistance. Since the flex sensor has a flat resistance of 25kω and a bend resistance of 45kω to 125kω we want a fixed resistor that has a value between these 2 resistance values the flat and the bend. This sensor doesn t contain any polarized terminal such as diode otherwise capacitor which means there is no positive negative terminal the required voltage of this sensor to activate the sensor ranges from 3 3v 5v dc which can be gained from any.

Before we get to circuit building and arduino programming here s a quick rundown of the flex sensor s important electrical characteristics. The flex sensor shown in this tutorial is a fl. For our circuit we create a voltage divider between the flex sensor and a fixed resistor. Arduino make a flex sensor for robotic hand cheap and simple.

One side of the sensor is printed with a polymer ink that has conductive particles embedded in it. Try to use the serial monitor below to find out what analog value you will take while you bending the sensor. The flex sensor circuit we will build is shown below. Flex sensor is a basically a variable resistor whose terminal resistance increases when the sensor is bent.