28122 Parallax Inc, 28122 Datasheet - Page 70
28122
Manufacturer Part Number
28122
Description
KIT WHAT'S A MICRO:PARTS ONLY
Manufacturer
Parallax Inc
Datasheet
1.28123.pdf
(340 pages)
Specifications of 28122
Accessory Type
Parts Kit
Product
Microcontroller Accessories
Core Processor
PIC16C57c
Flash
128 Bytes
Operating Supply Voltage
9 V
Board Size
31 mm x 16 mm
For Use With/related Products
Board of Education Full Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Introducing the Bi-Color LED
The bi-color LED’s schematic symbol and part drawing are shown in Figure 2-16.
The bi-color LED is really just two LEDs in one package. Figure 2-17 shows how you
can apply voltage in one direction and the LED will glow red. By disconnecting the LED
and plugging it back in reversed, the LED will then glow green. As with the other LEDs,
if you connect both terminals of the circuit to Vss, the LED will not emit light.
Red
1
2
Green
LED-
bicolor
1
2
Figure 2-15
Bi-color LED in a
Security Device
When the door is
locked, this bi-color
LED glows red.
When the door is
unlocked by an
electronic key with
the right code, the
LED turns green.
Figure 2-16
Bi-color LED
Schematic symbol (left)
and part drawing (right).
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