Ohmite FSP Series Integration Manual Download Page 3

v1.0 Mar 2018

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Ohmite FSP Series Integration Guide: Force Sensing Potentiometer

Integration Guide

Force Sensing Potentiometer

1  Force Sensing Potentiometer (FSP) Overview

This guide covers Ohmite’s standard Force Sensing Potentiometer offerings FSP01CE, FSP02CE and FSP03CE. These 

sensors operate as both position and force sensors offering users the ability to control menu navigation, device 

function, movement, audio control and many other HMI interaction in a more reliable and intuitive manner. Adding 

additional opportunities for user interaction, haptic control lighting, and integration methods.

Interfacing to an FSP sensor is simple and can be achieved using a number of different methods either with a 

dedicated microcontroller outputting serial data to a host controller, or directly linked to the host with a few simple 

external passive components.

This guide provides all the necessary technical information for the successful integration of Ohmite’s force sensing 

potentiometers into products such as:

•  Media controllers

•  Computer and peripherals

•  E-readers

•  Industrial, scientific or medical devices

•  Home automation and lighting control

•  Midi controllers

•  White goods

•  IOT devices

Summary of Contents for FSP Series

Page 1: ...2018 1 Ohmite FSP Series Integration Guide Force Sensing Potentiometer Integration Guide Force Sensing Potentiometer To be used in conjunction with current FSP series data sheets available at www ohm...

Page 2: ...Force Sensing Potentiometer FSP Overview Page 3 2 FSP01CE FSP02CE Introduction Page 4 3 FSP01CE FSP02CE Construction Page 4 4 FSP01CE FSP02CE Connection and Sampling Page 4 5 FSP01CE FSP02CE Recommen...

Page 3: ...nner Adding additional opportunities for user interaction haptic control lighting and integration methods Interfacing to an FSP sensor is simple and can be achieved using a number of different methods...

Page 4: ...or best results a microcontroller with an analog to digital converter ADC module should be used to measure the position and relative force of touch along the length of the sensor The pins shown in Fig...

Page 5: ...ng the measured analog value of the position APOS the values for R1 and R2 can be approximated and the value of RW the resistance which represents the inverse of the force can be calculated 4 2 3 Meth...

Page 6: ...es Linear relationship between applied force and ADC output Linearity continues beyond 1kg finger force Applying force near one end of the pot where the voltage is high results in a different ADC outp...

Page 7: ...ET layer also with conductive dielectric and an FSR ink print A mounting adhesive on the rear The main active area of the Ring Sensor is a ring of printed carbon ink divided in three arcs by three ele...

Page 8: ...ed in the previous section will be left floating Thus if the furthest pin is pin 4 as shown in Figure 9 on the previous page then Configure pin4 as an input pin so that it floats Drive pin 2 to high v...

Page 9: ...Sensing Potentiometer Integration Guide Force Sensing Potentiometer 9 Contact Headquarters 27501 Bella Vista Parkway Warrenville IL 60555 USA Toll Free 1 866 9 OHMITE International 1 847 258 0300 Fax...

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