28129 Parallax Inc, 28129 Datasheet - Page 135
![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: 135 of 176
- Download datasheet (3Mb)
All that's left is to plug in the numbers to solve for t
resistance and capacitance values shown in Figure 7-1, and V
V
Then, the same calculation can be done for t
An oscilloscope could be used to monitor the output voltage of the RC circuit from
Figure 7-1. The response when a single, very wide pulse (a voltage step) is applied would
resemble that shown in Figure 7-3. As you can see, it takes just a fraction of a second for
the capacitor to charge up to 5 volts. Nonetheless, it is a gradual change when compared
to pulses sent by the BASIC Stamp, which can be as narrow as 2 microseconds
Output
is 2.5 volts.
ln
t
t
2
. 4
5 .
95
1
Volts
−
Volts
V
V
=
Output
Input
=
−
−
R
R
×
×
C
=
C
×
ln
×
ln
ln
e
1
R
−
1
×
−
t
C
−
V
V
V
Output
V
Input
Output
Input
⇒
=
R
=
−
−
×
−
(
t
10
C
(
10
×
=
×
10
ln
4.95 Volts
10
3
1
)
3
×
)
−
×
1 (
V
1 (
V
×
Output
Input
.
×
10
10
−
2.5 volts
6
−
)
6
×
)
×
ln
⇒
ln
1
and t
−
1
t
−
2
5
=
5 .
0 .
. 4
5
−
Input
4.95 volts
95
0 .
R
=
×
. 6
C
=
= 5 volts. The first
93
×
46
ln
×
. R and C are the
1 .
10
1
×
−
−
10
3
V
sec
−
V
3
Output
Input
sec
onds
onds
.
.
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