28119 Parallax Inc, 28119 Datasheet - Page 97

• 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

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