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24
Turn on the slide switch (S1); the display on the LED-MC (U29) shows
“00”. Press the A button on the selector (S8) to increase the ones digit on
the display, and press the C button on the selector to increase the tens
digit on the display. When the display shows “21”, press the B button on
the selector to start.
The red/yellow LED (D10) will be on continuously, but changing colors
at varying speed. The red & green LEDs (D1 & D2) will be alternately
between on and off, opposite each other, and synchronized with D10.
Turn on the slide switch (S1). The programmable fan (M8) spins, and
changes the phrase displayed about once a second. See project 15 to
change the phrases displayed.
Project 40
Dual Bi-Color Lights
Fast Phrase Changer
This circuit uses the alarm IC (U2) to
control the programmable fan (M8),
cycling through the six phrases stored
in it faster than normal.
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Project 41
The red & green LEDs together act
as a bi-color LED. Compare them to
the red/yellow LED, which is a true bi-
color LED.
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