How to Use a Force Sensitive Resistor - Arduino Tutorial

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Introduction: How to Use a Force Sensitive Resistor - Arduino Tutorial

About: Arduino Tutorials by Codebender.cc Team

In this tutorial you will learn how to use an FSR - Force Sensitive Resistor with Arduino to fade an LED. This sensor is a variable resistor just like a photocell or flex sensor. The resistance changes by applying pressure on it.

Let's get started!

Step 1: What You Will Need

For this tutorial you will need:

  • Arduino uno
  • Breadboard
  • Force sensitive resistor
  • LED
  • 10KOhm & 220 Ohm resistors

Step 2: The Circuit

The connections are pretty easy, see the image above with the breadboard circuit schematic.

Step 3: The Code

Here's the code, embedded using Codebender!

Try downloading the Codebender plugin and clicking on the "Run on Arduino" button to program your Arduino board with this sketch. And that's it, you've programmed your Arduino with this sketch.

How it works:

  • Read analog value from flex sensor
    :: value=analogRead(sensorPin);
  • Map analog values 0-1023 to PWM values 0-255
    :: value = map(value, 0, 1023, 0, 255);
  • Send pwm value to led
    :: analogWrite(ledPin, value);

You can make your own modifications to the code by clicking the "Edit" button.

Step 4: Well Done!

You have successfully completed one more Arduino "How to" tutorial and you learned how to use a Force Sensitive Resistor with Arduino.

I hope you liked this, let me know in the comments.

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    24 Discussions

    0
    Bernard1232456
    Bernard1232456

    Question 2 years ago

    Bonjour, vous pouvez m’appelez jean ou bernard comme voulvoul J'aimerai savoir le branchement et le code pour convertir le signal en kg!!!!

    0
    Mase Hajika
    Mase Hajika

    3 years ago

    what is the maximum force?

    0
    FAisalF17
    FAisalF17

    4 years ago

    i need a code to measure how much force is applied on the sensor.....

    0
    FAisalF17
    FAisalF17

    4 years ago

    i need a code to measure how much force is applied on the sensor.....

    0
    FAisalF17
    FAisalF17

    4 years ago

    i need a code to measure how much force is applied on the sensor.....

    0
    seanmcquaid1
    seanmcquaid1

    4 years ago

    I am really new to all of this but would there be a way to measure the time that a force is applied? the amount of force is irrelevant for what i want to do. I just need to know if the time that the force is applied is < or > a certain time. many thanks

    0
    else23
    else23

    4 years ago

    What I don't really understand, why do I need a resistor to connect to the ground of arduino? How can I decide about the value of the resistor?

    0
    sangit-niroula
    sangit-niroula

    Reply 4 years ago

    when we use any analog type sensors, we need to connect a resistor having around equal value to the sensor in series to make VOLTAGE DIVIDER CIRCUIT. VOLTAGE DIVIDER CIRCUIT is necessary to observe and grab the change in sensor parameter according to its physical correspondences..

    0
    Pigjosh31
    Pigjosh31

    4 years ago

    What if I was to want to take 4 FSR's and apply a direction to each one such as left, right, up, and down. To make a controller that responded to where you push on the screen. Would anyone have any ideas on how to do that.

    0
    samsneatprojects
    samsneatprojects

    Reply 4 years ago

    You could definitely do that! You just have to wire four of these sensors up, and write some fairly simple code. What do you want to use the controller for? I'd be glad to help out if you have any trouble with the project.

    0
    AjayK95
    AjayK95

    4 years ago

    how to masure the force or load(gor kg) using force sensitive resistor

    0
    mutualhelp
    mutualhelp

    5 years ago

    can i use this with a raspberry pi?

    0
    BSWill
    BSWill

    5 years ago on Introduction

    I know there are a million uses for this resistor (sensor), but I would really appreciate a list of some applications that this would excels as a viable option to use. Is there a place where I could see some of its current applications?

    0
    codebender_cc
    codebender_cc

    Reply 5 years ago

    Hi! You can use it as a touch button switch!! :D

    0
    kooth
    kooth

    5 years ago on Introduction

    Thanks for posting this. I have a few of these in a kit I got a few years ago but I hadn't gotten around to trying them out. Your Instructable has piqued my interest!

    0
    RamasamyN
    RamasamyN

    5 years ago on Introduction

    do you need jumper wires with the broadboard?

    0
    beer-liner
    beer-liner

    Reply 5 years ago on Introduction

    I hate to state the absolutely Obvious, But you can see in the circuit that there are jumpers, wouldn't you think there are necessary when using a breadboard?

    0
    david.eaton
    david.eaton

    Reply 5 years ago on Introduction

    Hey, be nice. This could be a 7 year old kid that invents an artificial epiglottis for you someday. Jumpers are not mentioned in the stuff you will need. It's easy for us who do this without thinking to forget what is obvious to a veteran is obscure to a noob.

    Yes, there are jumpers. Keep looking at following pictures, it will begin to make sense.