2. FSR with led

 FSR with led

Circuit:

1. FSR Setup:
   • Connect one end of the FSR to 5V.
   • Connect the other end of the FSR to an analog pin (e.g., A0) and a 10kΩ resistor.
   • Connect the other side of the resistor to GND.
2. LED Setup:
   • Connect the positive (anode) of the LED to a digital pin (e.g., LED1 to pin 13, as per your setup).
   • Connect the negative (cathode) of the LED to a current-limiting resistor (e.g., 220Ω) and then to GND.

Code:

The code below reads the FSR value and turns on the LED if the force exceeds a defined threshold.

C++ Code
int fsrPin = A0;     // Analog pin connected to FSR
int fsrReading;      // Variable to store the FSR reading
int threshold = 600; // Threshold value to turn on the LED

int ledPin = 13;     // Pin connected to LED1

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
  Serial.begin(9600);      // Start serial communication at 9600 baud
}

void loop() {
  fsrReading = analogRead(fsrPin); // Read the value from FSR

  Serial.print("FSR Reading: ");
  Serial.println(fsrReading); // Print the FSR reading

  if (fsrReading > threshold) {
    digitalWrite(ledPin, HIGH); // Turn on the LED if reading exceeds the threshold
  } else {
    digitalWrite(ledPin, LOW);  // Turn off the LED if reading is below the threshold
  }

  delay(500); // Add delay for readability
}

Explanation:

1. Threshold Setting:

   • The threshold variable defines the FSR reading value needed to turn on the LED. You can adjust this threshold based on your requirements and the weight/pressure you want to detect.

2. Reading and LED Control:

   • analogRead(fsrPin) reads the FSR value (0-1023).
   • If fsrReading exceeds the threshold, digitalWrite(ledPin, HIGH) turns on the LED. Otherwise, digitalWrite(ledPin, LOW) turns it off.

3. Adjusting the Threshold:

   • You can test the circuit with different pressures and note the corresponding fsrReading values in the Serial Monitor. Adjust threshold accordingly to achieve the desired LED behavior.