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27
Turn on the slide switch (S1); the display on the LED-MC (U29) shows
“00” and a siren sound plays. Press the A button on the selector (S8) once
to make the display show “01”, then press the B button on the selector to
start.
Every few seconds the speaker (SP2) randomly plays one of three siren
sounds, and the U29 LED display shows a random pattern.
Modify the project 53 circuit by
adding the red & red/yellow LEDs
(D1 & D10) as shown. It works the
same way, but has more lights
and the sound is not as loud.
Modify the preceding circuit
by adding the LEDs in the
disco motor (DM) using blue
& red jumper wires as shown.
It works the same way, but
has more lights.
Project 53
Random Siren Selector
Project 55 Project 56
Use the preceding circuit. Turn on the slide switch (S1); the display on
the LED-MC (U29) shows “00”. Press the A button on the selector (S8)
two or three times to increase the ones digit on the display. When the
display shows “02” or “03”, press the B button on the selector to start.
The circuit works the same, except that it changes faster. “03” is faster
than “02”.
Project 54 Fast Random Siren Selector
LED Random
Siren
Selector
5-LED
Random
Siren
Selector
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