Another simple example is to hook up a speaker to your Arduino and get a bit musical with it. These are fairly low cost and can quite often be salvaged from other pieces of electronic equipment
Layout
speaker example
Schematic
speaker schematic
Code
A simple SOS example. You could do all of the morse code alphabet (thats coming later) or obviously do something more tuneful.
A better way of doing this is to have functions for the dots and dashes, again in the future morse code example we’ll do that
int pin = 8;
int note = 988;
void setup()
{
}
void loop()
{
//3 dots for the S
for (int i=0; i<3; i++)
{
tone(pin, note, 100);
delay(200);
noTone(pin);
}
delay(200);
//3 dashes for the O
for (int i=0; i<3; i++)
{
tone(pin, note, 300);
delay(400);
noTone(pin);
}
delay(200);
//3 dots for the S again
for (int i=0; i<3; i++)
{
tone(pin, note, 100);
delay(200);
noTone(pin);
}
delay(200);
//wait 3 seconds
delay(3000);
}
Parts List
Amount Part Type 1 Arduino Uno (Rev3) 1 100 Ω Resistor 1 Loudspeaker
Links