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Force Sensor Arduino Code | Complete Guide with Example Sketch
Force Sensor Arduino Code
The combination of a Force Sensor + Arduino is the fastest way to start experimenting with force, weight, and pressure measurement in DIY, educational, and IoT projects. Whether you’re using a Force Sensitive Resistor (FSR) or a load cell with HX711 amplifier, Arduino makes it simple to capture readings and control devices.
At Sensors and Gauges, we empower innovators to build smarter projects by providing accurate force sensors, load cells, and integration guides.
A force sensor converts applied pressure or load into an electrical signal. Common types used with Arduino include:
FSR (Force Sensitive Resistor): Resistance decreases as pressure increases.
Load Cell + HX711 Module: Measures weight/force with higher accuracy.
🛠 Components Needed
To run a Force Sensor Arduino Code example, you’ll need:
✅ Arduino Uno (or Nano, Mega) ✅ Force Sensitive Resistor (FSR) or Load Cell + HX711 module ✅ Breadboard + jumper wires ✅ Resistor (10kΩ for FSR voltage divider) ✅ USB cable + Arduino IDE
📖 Example 1: Arduino Code for Force Sensitive Resistor (FSR)
// Force Sensor Arduino Code (FSR Example)int fsrPin = A0; // FSR connected to Analog pin A0int fsrReading; // Variable to store FSR valueint ledPin = 9; // LED on digital pin 9voidsetup() {
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
}
voidloop() {
fsrReading = analogRead(fsrPin); // Read FSR value
Serial.print("FSR Reading = ");
Serial.println(fsrReading);
// Use FSR value to control LED brightnessint brightness = map(fsrReading, 0, 1023, 0, 255);
analogWrite(ledPin, brightness);
delay(100);
}
💡 How it works:
The FSR changes resistance when pressed.
Arduino reads the voltage divider output.
The LED brightness varies with applied force.
📖 Example 2: Arduino Code for Load Cell + HX711
// Force Sensor Arduino Code (Load Cell with HX711)#include"HX711.h"#define DT 3 // HX711 DT pin connected to Arduino pin 3#define SCK 2 // HX711 SCK pin connected to Arduino pin 2
HX711 scale;
voidsetup() {
Serial.begin(9600);
scale.begin(DT, SCK);
scale.set_scale(); // Set scale factor after calibration
scale.tare(); // Reset scale to 0
Serial.println("Load Cell Ready...");
}
voidloop() {
if (scale.is_ready()) {
long reading = scale.get_units();
Serial.print("Force/Weight: ");
Serial.println(reading);
} else {
Serial.println("HX711 not connected!");
}
delay(500);
}
💡 How it works:
The HX711 amplifier converts the load cell’s microvolt signal.
Arduino reads calibrated values as weight or force.
Suitable for digital scales, robotics, and automation.
🚀 Applications of Force Sensor Arduino Projects
DIY electronic weighing scales
Robotic grippers with force feedback
Pressure-sensitive musical instruments
Smart chairs, beds, and fitness devices
Laboratory & educational force measurement projects
