the 32 levels can be aligned to the transitions of the five MSBs of an eight-bit
digital-to-analog converter (DAC) so that the DAC output bits indicate the
status of each door. Alternatively, the DAC could feed a microprocessor and
lookup table to decipher the status of all five doors.
With a microprocessor, you could easily add alarm, arm, disarm, and
logging features. Depending on the number of doors, a stabilized constant
current square wave drive of the series string of diode modules would probably
be required. I haven’t built this particular addition, so here is your opportunity
for a design project and a follow-up article. NV
AL L
ELEC TRONI CS
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CAT# PS-255
10 for
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$700 each
12 VDC GEAR MOTOR
Great little motor for
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$595 each 25 for $5.00 each 100 for $4.50 each
HOOK-UP WIRE,
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Great for projects.
Bundle of 8 three
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CAT# HW- 24
$100 for 2
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BATTERY TESTER
Test AAA, AA, C, D, 9V
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$125 each 10 for $1.10 each 100 for 95¢ each
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Model# YSU20120.
5' cord with 2.1mm coax plug,
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SPST N.O. PUSHBUTTON
Attractive and functional dome-shaped momentary pushbutton.
0.70" dia. black plastic bezel.
0.45" red plunger. Extends 0.3"
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Solder terminals.
CAT# PB-138
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5MM RED-GREEN
FLASHING LED
180 flashes per minute.
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45¢each
100 for 40¢ each
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June 2017 27