/*
Flex Sensor and LEDs created by ScottC on 23rd May 2011
updated on 16/05/2012.

—————————————————–*/

//Flex Sensor Pin (flexPin)
//the analog pin the Flex Sensor is connected to
int flexPin = 0;

void setup() {
for (int i=4; i<14; i++){
pinMode(i, OUTPUT); //sets the led pins 4 to 13 to output
}
}

void loop(){
//Ensure to turn off ALL LEDs before continuing
for (int i=4; i<14; i++){
digitalWrite(i, LOW);
}

/* Read the flex Level
Adjust the value 130 to 275 to span 4 to 13
The values 130 and 275 may need to be widened to suit
the minimum and maximum flex levels being read by the
Analog pin */
int flexReading = map(analogRead(flexPin), 130, 275, 4, 13);

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

/*Call the blink function: this will turn the LED on for 10 milliseconds, and keep it
off for only 1 millisecond. You can change the blink rate by changing these values,
however, I want a quick response time when the flex sensor bends, hence the small
values. 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 this Delay if you want to see an actual blinking effect.
delay(offTime);
}