70009 Parallax Inc, 70009 Datasheet - Page 67

• Manufacturer Part Number: 70009
• Description: BOOK UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc
• Type: Signal Analysisr

Specifications of 70009

• Style: Book
• Title: Understanding Signals
• Contents: Guide to Generate, View and Measure Wave Forms
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 70009PAR

RCTimeConstantWithPhotoresistor.bs2
' Understanding Signals - RCTimeConstantWith Photoresistor.bs2
' Read photoresistor in RC-time circuit using RCTIME command.
'{$STAMP BS2}
'{$PBASIC 2.5}
time
DO
LOOP
HIGH 0
HIGH 15
PAUSE 10
RCTIME 15, 1, time
LOW 0
DEBUG HOME, "(time/1000)*2 = ", DEC3 (time/1000)*2
LOW 15
√
√
Run the program RCTimeConstantWithPhotoresistor.bs2.
Cover and uncover the photoresistor with your hand, and observe the discharge
time extending or contracting. You may need to adjust the Horizontal dial to best
display the waveform. The Debug Terminal will display the discharge time in
milliseconds.
VAR
CH1
CH2
Horizontal Dial
Trigger Source
Trigger Edge
Trigger Mode
Run / Stop Mode
Trigger Voltage
Word
2 V / division
Off
10-20 ms / division
Channel 1
Rising
Auto
Continuous
2 V
' 5 V on P0
' 5 V to capacitor for charge curve
' time for capacitor to fully charge
Figure 4-11:
Configuration for
OPTAscope to
measure R/C
curves