help using multiple flex sensor

Other Hardware Sensors
1

hi guys,

i'm trying to use multiple flex sensors with LED's. according to the bent, one of the LED will be on and the others are off. i tested for one sensor and it works fine. but i don't know how to turn it for multiple sensors. any one have an idea please ?

that's my code for one sensore

//Flex Sensor Pin (flexPin)
int flexPin = A0;

void setup() {
  for (int i = 4; i < 13; i++) {
    pinMode(i, OUTPUT); //sets the led pins 4 to 13 to output
    Serial.begin(9600);
  }
}

void loop() {
  //Ensure to turn off ALL LEDs before continuing
  for (int i = 4; i < 13; i++) {
    digitalWrite(i, LOW);
  }

  // Read the flex Level
 
  int flexReading = map(analogRead(flexPin), 400, 755, 4, 12);

  // Make sure the value does not go beyond 4 or 13
  int LEDnum = constrain(flexReading, 4, 12);

  /*Call the blink function: this will turn the LED on for 10 milliseconds, and keep it
    off for only 1 millisecond. LEDnum determines which LED gets turned on.*/
  blink(LEDnum, 10, 1);
}

// The blink function - used to turn the LEDs on and off
void blink(int LEDPin, int onTime, int offTime) {
  // Turn the LED on
  digitalWrite(LEDPin, HIGH);

  // Delay so that you can see the LED go On.
  delay(onTime);

  // Turn the LED Off
  digitalWrite(LEDPin, LOW);
  
Serial.print("Flex Value = ");
Serial.println(analogRead(flexPin));

  // Increase if you want to see an actual blinking effect.
  delay(offTime);
}
2

Help yourself (and others) by better defining your intentions:

What does "multiple sensors" mean? 2, 30, 500, 7000 sensors?

What is supposed to happen when one or more of these multiple sensors is bent?

Also,

for (int i = 4; i < 13; i++) {
    pinMode(i, OUTPUT); //sets the led pins 4 to 13 to output
    Serial.begin(9600);
  }

Why are you calling Serial.begin so many times?

3

Does this do what you want?

void setup() {
  Serial.begin(9600);
  for (int i = 4; i < 13; i++) {
    pinMode(i, OUTPUT); //sets the led pins 4 to 12 to output
  }
}

void loop() {

  //Ensure to turn off ALL LEDs before continuing
  for (int i = 4; i < 13; i++) {
    digitalWrite(i, LOW);
  }

  for (int flexPin = A0; flexPin <= A5; flexPin++) {
    // Read the flex Level
    int flexValue = analogRead(flexPin);

    Serial.print("Flex Value = ");
    Serial.println(flexValue);

    int flexReading = map(flexValue, 400, 755, 4, 12);

    // Make sure the value does not go beyond 4 or 12
    int LEDnum = constrain(flexReading, 4, 12);

    /*Call the blink function: this will turn the LED on for 10 milliseconds, and keep it
      off for only 1 millisecond. LEDnum determines which LED gets turned on.*/
    blink(LEDnum, 10, 1);
  }
}

// The blink function - used to turn the LEDs on and off
void blink(int LEDPin, int onTime, int offTime) {
  // Turn the LED on
  digitalWrite(LEDPin, HIGH);

  // Delay so that you can see the LED go On.
  delay(onTime);

  // Turn the LED Off
  digitalWrite(LEDPin, LOW);

  // Increase if you want to see an actual blinking effect.
  delay(offTime);
}