28119 Parallax Inc, 28119 Datasheet - Page 65
28119
Manufacturer Part Number
28119
Description
KIT UNDERSTANDING SIGNALS
Manufacturer
Parallax Inc
Datasheet
1.28119.pdf
(137 pages)
Specifications of 28119
Lead Free Status
Contains lead
Accessory Type
Oscilloscope
Interface Type
USB
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
281197-2
Manufacturer:
TE
Quantity:
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Company:
Part Number:
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If you are using the HomeWork Board, your calculation must account for the added
resistor value:
Again, your actual measurements may vary in accordance with the tolerances of the
resistor and capacitor you use.
ACTIVITY #2: VARIABLE RESISTORS IN AN RC NETWORK
In this activity we will measure the discharge time of an RC network and compare it to
the BASIC Stamp
(such as a photoresistor) with a known capacitor and resistor and measure it against the
OPTAscope to see how the two values compare.
Parts Required
(1) 220 Ω resistor
(1) 10 µF capacitor
(1) Photoresistor
(5) Jumper wires
Building the Photoresistor RC Network Circuit
Add a photoresistor to amend the circuit you previously built to match the schematic
(Figure 4-9) andwiring diagram (Figure 4-10). The 220 Ω resistor and 10 µF capacitor
will act as a filter for the
DEBUG
Time
Time
Time
FREQOUT
Time
Time
Constant
values. Then, we will calculate the value of a variable resistor
Constant
Constant
Constant
Constant
command to create a sine wave.
=
=
0.0122
=
(
0.01
220
=
=
1220
1000
seconds
+
seconds
1000
x
x
0.00001
0.00001
)
x
or
or
0.00001
10
12.2
ms
ms
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