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FSR402 Force Sensitive Resistor

Module introduction

FSR 402 force sensitive resistor, it can easily detect external pressure. It is essentially a variable resistor, similar to the principle of a photoelectric sensor or a bending sensor, and changes the resistance value by applying a pressure change on it.

How to Use a Force Sensitive Resistor

Step 1: What You Will Need


You will need:

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

Step 2: The Circuit

  • FSR402
    + ---->5v
    - ---->10kOhm ----->GND
    - ---->A0
  • LED
    + ------->220Ohm ----->D3(PWM)
    - ------->GND

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

Step 3: The Code
Sample code:

const int ledPin = 3; //pin 3 has PWM funtion
const int sensorPin = A0; //pin A0 to read analog input

int value; //save analog value

void setup(){

pinMode(ledPin, OUTPUT); //Set pin 3 as 'output'
Serial.begin(9600); //Begin serial communication


void loop(){

value = analogRead(sensorPin); //Read and save analog value from potentiometer
Serial.println(value); //Print value
value = map(value, 0, 1023, 0, 255); //Map value 0-1023 to 0-255 (PWM)
analogWrite(ledPin, value); //Send PWM value to led
delay(100); //Small delay


If you need FSR402, have a look at this product:
👉 FSR402

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