Instructions

Game and Knowledge in Electronics-Lab

Add the tricolour LED to the circuit with the loudspeaker.

The micro-controller can toggle two colours. To do this,

the connectors MO7 and MO8 must be connected to TC1

and TC2. Of course, you mustn’t forget the common nega-

tive pole TC4, which is connected to M–.

Siren

The corresponding

programme is selected

by connecting A and C.

And don’t forget: The

positive pole must be

connected at the very end.

This programme does two

things at the same time:

It toggles the sound and

it toggles the LED colours.

This creates a siren like

the one on a police car

or ambulance. Change

the circuit so that, instead

of the red and the green

LED, the blue LED will ﬂash.

This makes the effect more

realistic.

Build your own signal

generator, with which the

speed of the sound repetitions

can change using the variable

resistor. To do this, the rotary

knob is connected between

M+ and MI5. The colour LED

is also part of the circuit, and

the corresponding programme

is started by connecting A-D.

Turn the rotary knob all the

way to the left, the sounds and

lights change only slowly. Turn

it all the way to the right and

the repetitions will be very

fast. You can set any speed in

between, just as you like.