28129 Parallax Inc, 28129 Datasheet - Page 18
![TEXT BASIC ANALOG & DIGITAL](/photos/6/49/64954/mfg_28129_sml.jpg)
28129
Manufacturer Part Number
28129
Description
TEXT BASIC ANALOG & DIGITAL
Manufacturer
Parallax Inc
Type
Programmingr
Datasheet
1.28129.pdf
(176 pages)
Specifications of 28129
Style
Book
Title
Basic Analog and Digital
Contents
Basic Analog and Digital Text
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
- Current page: 18 of 176
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The potentiometer is what makes the analog output. The op-amp is wired to function as a
voltage follower. The voltage follower drives the analog LED output. Then there's a
separate circuit that uses a BASIC Stamp I/O pin to drive an LED.
Figure 1-8 shows a breadboard example of the schematic from Figure 1-7. For extra tips
on building circuits on the breadboard, consult What’s a Microcontroller?
P12
P7
output from
Pot with
terminal
Vdd
analog
Vss
wiper
100k
Pot
Ω
follower circuit
Op-Amp
voltage
Vdd
Vss
A
LM358
Analog LED
LED
output
Vss
470 Ω
output.
Binary
LED
Vss
LED
470 Ω
Figure 1-7
Circuit Schematic.
Remember to treat
this schematic like
a list of
connections for
building your
circuit.
Although this circuit
only has a few
parts, it actually
has 4 separate sub
circuits, and each
has a different
function as shown
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