Gather all parts
Use 3 different colors of long small balloons.
Drill 3 holes of 5 mm into a ping pong ball.
Assembling the long leds
Stretch a balloon over the LED and secure it with iron wire, wrapped at the bottom of the LED.
You need to stretch the balloon, otherwise the color will be too dark.
Test it out before securing the wire.
Cut excessive balloon to make it neat
Assembling the ball and circuit
Put the 3 leds into the ping pong ball.
Assemble the circuit as seen.
Remove the middle jumper on the protobit.
Insert a jumper wire in the middle top connection.
Connect the other end of this wire in pin d10 of the arduino
Upload the code
Upload the ino code into the arduino.
Power up your circuit and see the ping pong ball changing color.