Circuit 8 & 13

Circuit 8:

Circuit 13:

Fritzing:

Code:

/*
  Analog Input
 Demonstrates analog input by reading an analog sensor on analog pin 0 and
 turning on and off a light emitting diode(LED)  connected to digital pin 13. 
 The amount of time the LED will be on and off depends on
 the value obtained by analogRead(). 
 
 The circuit:
 * Potentiometer attached to analog input 0
 * center pin of the potentiometer to the analog pin
 * one side pin (either one) to ground
 * the other side pin to +5V
 * LED anode (long leg) attached to digital output 13
 * LED cathode (short leg) attached to ground
 
 * Note: because most Arduinos have a built-in LED attached 
 to pin 13 on the board, the LED is optional.
 
 
 Created by David Cuartielles
 Modified 16 Jun 2009
 By Tom Igoe
 
 http://arduino.cc/en/Tutorial/AnalogInput
 
 */

int sensorPin = 0;    // select the input pin for the potentiometer
int ledPin = 13;      // select the pin for the LED
int sensorValue = 0;  // variable to store the value coming from the sensor

void setup() {
  // declare the ledPin as an OUTPUT:
  pinMode(ledPin, OUTPUT);  
}

void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(sensorPin);    
  // turn the ledPin on
  digitalWrite(ledPin, HIGH);  
  // stop the program for  milliseconds:
  delay(sensorValue);          
  // turn the ledPin off:        
  digitalWrite(ledPin, LOW);   
  // stop the program for for  milliseconds:
  delay(sensorValue);                  
}
////comment that code ^ and uncomment this code for circuit 13
//int sensePin = 2; // the pin the FSR is attached to
//int ledPin = 9; // the pin the LED is attached to (use one capable of PWM)
//void setup() {
// Serial.begin(9600);
// pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
//}
//void loop() {
// int value = analogRead(sensePin) / 4; //the voltage on the pin divded by 4 (to 
// //scale from 10 bits (0-1024) to 8 (0-255)
// analogWrite(ledPin, value); //sets the LEDs intensity proportional to 
// //the pressure on the sensor
// Serial.println(value); //print the value to the debug window
//}