Ardunio Controlled Toy Piano, by Julia Duggan and Chae-Hee Park

Every second, the Arduino turns on the piano, making a noise.

Materials

- 8 male to male wires

- electrical tape

- 1 1k ohm resistor

- 1 transistor

- 1 relay

- 9v battery and snap-on connecter clip

- arduino uno board

- toy piano

- bread board

-screwdriver

- diode rectifier

- USB cable

Using a screw driver, unscrew the screws that hold the front and back together, exposing the circuit.

Follow the diagram as shown and build the relay circuit.

Using electrical tape, connect the black and red wires to each side of the circle button on the circuit board. Make sure each side is connected to one wire.

int RelayPin = 13; // the relay is connected to pin 13

void setup() { // put your setup code here, to run once:

pinMode (RelayPin, OUTPUT); // tne relay is an output }

void loop() { // put your main code here, to run repeatedly:

digitalWrite(RelayPin, HIGH); // power is going to pin 13

delay (1000); // there's a delay for 1 second

digitalWrite(RelayPin, LOW); // the power to pin 13 is turned off

delay (1000); // there is a delay for 1 second }