Assignment-10B: Variable Resistors (Circuits 08 & 13)

Assignment-10B: Variable Resistors (Circuits 08 & 13)

(Circuit 08) setup: (Circuit 08)


diagram diagram


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


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:
// turn the ledPin off:
digitalWrite(ledPin, LOW);
// stop the program for for milliseconds:

Circuit 13:

Project 13 setup: (Circuit 13)

In action:


diagram diagram



 * Force Sensitive Resistor Test Code
 * The intensity of the LED will vary with the amount of pressure on the sensor

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() {
  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

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