30056 Parallax Inc, 30056 Datasheet

Optical Sensor Development Tools SENSOR DEMO KIT FLEXIFORCE

30056

Manufacturer Part Number

30056

Description

Optical Sensor Development Tools SENSOR DEMO KIT FLEXIFORCE

Manufacturer

Parallax Inc

Datasheet

1.30056.pdf (4 pages)

Specifications of 30056

Operating Voltage

5 V

Maximum Operating Temperature

+ 70 C

Minimum Operating Temperature

- 10 C

Description/function

SSB Sensor

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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INTRODUCTION

This manual describes how to use FlexiForce’s Single Serial Button (SSB). These sensors are ideal for designers, engineers

and researchers who need to measure forces without disturbing the dynamics of their test. The FlexiForce sensors can be

used to measure both static and dynamic forces (up to 1000 lbf), and are thin enough to enable non-intrusive measure-

ment.

SSB sensors use a resistive-based technology. The application of a force to an active sensor results in a change in the

resistance of the sensing element in inverse proportion to the force applied.

OVERVIEW

Sensor Construction

The SSB sensor is an ultra-thin (0.005”), flexible printed circuit. It is 0.55” (14 mm.) wide and 8” (203 mm.) in

length, from the end of the connector to the tip of the sensor. Sensors are available with specificied maximum forces of 1,

25, 100, 500, and 1000 lbf

are constructed of two layers of substrate, such as a polyester film. On each layer, a conductive material (silver) is ap-

plied, followed by a layer of pressure-sensitive ink. Adhesive is then used to laminate the two layers of substrate together

to form the sensor. The ’active sensing area’ is defined by the silver circle on top of the pressure-sensitive ink. Silver

extends from the sensing area to the connectors at the other end of the sensor, forming the conductive leads. SSB sensors

are terminated with a 3-pin Berg Clincher

outer pins of the connector are active and the center pin is inactive.

Application

The sensor acts as a resistor in an electrical circuit. When the sensor is unloaded, it’s resistance is very high. When a

force is applied to the sensor, this resistance decreases. This resistance can be read by connecting an ohmmeter to the

outer two pins of the sensor connector and applying a force to the sensing area.

There are many ways to integrate the SSB sensor into an application. One way is to incorporate it into a force-to-voltage

circuit. A means of calibration must then be established to convert the output into the appropriate engineering units.

Depending on the setup, an adjustment could then be done to increase or decrease the sensitivity of the sensor.

An example circuit is shown to the right. In this case, it is driven

by a 5 V DC excitation voltage. This circuit uses an operational

amplifier arrangement to produce an analog output based on the

sensor resistance and a fixed reference resistance. An analog-to-

digital converter can be used to change this voltage to a digital

output. In this circuit, the sensitivity of the sensor could be

adjusted by changing the reference resistance (R

ence resistance will make the sensor less sensitive, and increase it’s

active force range.

* When used in a circuit with a 20k

(refer to the ‘Saturation’ section)

FlexiForce

. The active sensing area is a 0.375” diameter circle at the end of the sensor. The sensors

reference resistance. The dynamic force range of the sensor can be adjusted by changing this resistance

connector, which allows them to be incorporated into a circuit. The two

); a lower refer-

-5 V

FlexiForce™

A-101

= V

*The range for R

* (R

) ; where

-9 V

9 V

is 1 k to 100 k

FlexiForce

= 20 k

= -5 V

OUT

Related parts for 30056

30056 Summary of contents

Page 1

FlexiForce INTRODUCTION This manual describes how to use FlexiForce’s Single Serial Button (SSB). These sensors are ideal for designers, engineers and researchers who need to measure forces without disturbing the dynamics of their test. The FlexiForce sensors can be used ...

Page 2

FlexiForce SENSOR LOADING CONSIDERATIONS The following general sensor loading guidelines can be applied to almost any application, and will help you achieve the most accurate results from your tests important that you read the ‘Sensor Performance Characteristics’ section ...

Page 3

Calibration Calibration is the method by which the sensor’s electrical output is related to an engineering unit, such as pounds or Newtons. To calibrate a sensor, simply apply a known force to the sensor, and equate the sensor output to ...

Page 4

FlexiForce Temperature Sensitivity To ensure accuracy, calibrate the sensor at the temperature at which it will be used in the application. The operating range for FlexiForce sensors is from 15°F (-9°C) to 140°F (60°C). FlexiForce sensor output may vary up ...

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