1.      INTRODUCTION

A force sensitive resistor is a sensor that changes its resistor in function of force that it receives. Force sensitive resistor behaviour its similar to a potentiometer.

2.      HOW TO CONNECT?

Materials:

·         Arduino UNO board

·         Protoboard

·         Some wire Jumpers

·         Force sensitive resistor

·         LED

·         220 ohms resistor

·         10K ohms resistor

This sensor should be connected like a potentiometer directly on a protoboard. Furthermore, this exercise also uses a LED to test the sensor. The schematic is the same that on CONNECTING_A_POTENTIOMETER with the potentiometer.

EXERCISE_A (Testing the sensor)

3.      PROGRAMMING

EXERCISE_A (Testing the sensor)

This program displays force sensor read value in serial monitor and in a LED. First, it declares the sensor and LED variables as INPUT, OUTPUT respectively, and starts the serial communication.

 

int force=A0;

int led=9;

int value=0;

void setup(){

pinMode(A0,INPUT);

pinMode(led,OUTPUT);

Serial.begin(9600);

}

 

On loop, value stores the read potentiometer value and convert it to a digital values with map() function.

 

void loop(){

  value=analogRead(force);//Read sensor's pin.

  value=map(value,0,1023,0,255);//Change range of values

  analogWrite(led,value);//Uses PWM function in led pin.

  Serial.print(value);

}