70009 Parallax Inc, 70009 Datasheet - Page 97

• 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

Using the External Trigger with 38kHzInfraredwithVaryingFrequency.bs2
' Understanding Signals - 38kHzInfraredwithVaryingFrequency.bs2
' 38 kHz infrared signal with detector feedback
' {$STAMP BS2}
' {$PBASIC 2.5}
DO
LOOP
HIGH 0
FREQOUT 7,3,38500
FREQOUT 7,1,38500
FREQOUT 7,1,38500
FREQOUT 7,2,38500
FREQOUT 7,2,38500
FREQOUT 7,1,38500
FREQOUT 7,1,38500
FREQOUT 7,2,38500
FREQOUT 7,1,38500
LOW 0
PAUSE 20
√
√
√
√
Configure your OPTAscope with the following settings. Note: to set the external
trigger at 10%, press the T button at the top left corner of the Plot Area, click the
right T button to move it back.
Point the IR LED and IR detector towards each other.
Connect the External Trigger TTL probe to P0 using a jumper wire.
Run the program 38kHzInfraredwithVaryingFrequency.bs2.
CH1
CH2
Horizontal Dial
Trigger Source
Trigger Edge
Trigger Mode
Run / Stop Mode
Trigger Voltage
Autoscale
1 V / division
2 V / division
1 ms / division
External at 10%
N/A
Normal
Continuous
N/A
On
Figure 7-8:
OPTAscope
configuration for
capturing infrared
signals