Getting started with arduino

Ok!, these are my first exercises for this seminar. I followed the directions and I did some exercises. Here they are:

Digital In: Button

First exercise with the Arduino board using a button to turn on and off the led that is on Pin 13.

Materials:
10 KΩ resistor
button

You can also see this code if you open the Button file in your Arduino Application.

 
int inputPin = 7;
 int pinVal = 0;
 int ledPin = 13;
 
 void setup(){
 pinMode(inputPin, INPUT);
 pinMode(ledPin, OUTPUT);
 Serial.begin(9600);
 }
 
 void loop(){
 
 pinVal = digitalRead(inputPin);
 if (pinVal == HIGH){
 Serial.println("Hight");
 digitalWrite(ledPin, HIGH);
 }else{
 Serial.println("Low"); 
 digitalWrite(ledPin, LOW);
 }
 }
 

Analog In: Potentiometer

Second exercise done for cheking how the analog input works.

Materials:
Potentiometer

You can also see this code if you open the Analoginput file in your Arduino Application. I added serial output to see what was the information sent by the potentiometer.

 
/*
 * AnalogInput
 * by DojoDave 
 *
 * Turns 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(). In the easiest case we connect
 * a potentiometer to analog pin 2.
 *
 * http://www.arduino.cc/en/Tutorial/AnalogInput
 */
 
 int potPin = 2; // select the input pin for the potentiometer
 int ledPin = 13; // select the pin for the LED
 int val = 0; // variable to store the value coming from the sensor
 
 void setup() {
 pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
 Serial.begin(9600);
 }
 
 void loop() {
 val = analogRead(potPin); // read the value from the sensor
 digitalWrite(ledPin, HIGH); // turn the ledPin on
 delay(val); // stop the program for some time
 digitalWrite(ledPin, LOW); // turn the ledPin off
 delay(val); // stop the program for some time
 Serial.println(val);
 }
 

Here I use the same Sketch but a different circuit. We just changed the potentiometer for a light sensor.
First I used a 10 KΩ resistor, and the input values from the sensor were very high, so I put a 220 Ω resistor in order to get lower values.

Analog sensor In, digital light Out:

Finally I put a LED that turns on when there is no light over the sensor.

While I was working on this exercise I realized that I could make a Theremin-music sequencer using several light sensor and several LEDs. I think I will try to do it for tomorrow.

 
int potPin = 2; // select the input pin for the sensor
 int ledPin01 = 13; // select the pin for one LED
 int ledPin02 = 7; // select the pin for another LED
 int val = 0; // variable to store the value coming from the sensor
 
 void setup() {
 pinMode(ledPin01, OUTPUT); // declare the ledPin01 as an OUTPUT
 pinMode(ledPin02, OUTPUT); // declare the ledPin02 as an OUTPUT
 Serial.begin(9600);
 }
 
 void loop() {
 val = analogRead(potPin); // read the value from the sensor
 Serial.println(val); // print the value from the sensor on the serial terminal.
 
 if(val<30){
 digitalWrite(ledPin01, HIGH); // turn the ledPin01 on
 digitalWrite(ledPin02, HIGH); // turn the ledPin02 on
 }else{
 digitalWrite(ledPin01, LOW); // turn the ledPin01 off 
 digitalWrite(ledPin02, LOW); // turn the ledPin02 off
 }
 }