28119 Parallax Inc, 28119 Datasheet - Page 70

• Manufacturer Part Number: 28119
• Description: KIT UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc

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

√
√
Calculate the resistance of the photoresistor with the following formula:
You could also measure a capacitor and calculates its value with this formula.
C = solve for this
R = solve for this
VP15 = 1.4 volts
Vdd = 5.0 volts
Table 4-1: Known Values at the Instant VP15 Crosses the
t = known
e ≈ 2.718
Values
R
If the value of resistance (R) is known, then the
The BASIC Stamp counts the time for us in 2
If the value of capacitance (C) is known, then
=
The value of e is a constant found in many
Threshold Voltage
The initial condition of the voltage at P15.
The final condition of the voltage at P15.
C
capacitance (C) can be determined.
resistance (R) can be determined.
×
algebra books, physics texts, etc.
ln
microsecond increments.
t
V
V
P
dd
15
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