27220 Parallax Inc, 27220 Datasheet - Page 129

• Manufacturer Part Number: 27220
• Description: BOOK STAMPWORKS
• Manufacturer: Parallax Inc

Specifications of 27220

• Accessory Type: Booklet
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: StampWorks
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

Moving Forward · Page 119
EXPERIMENT #20: INFRARED OBJECT DETECTION
This experiment demonstrates an interesting side-effect of using FREQOUT without
the audio filter circuit of Experiment #18; the effect allows us to modulate an
Infrared (IR) LED for use with an IR detector.
Look It Up: PBASIC Elements to Know
Bit (variable type)
•
Building the Circuit
The StampWorks parts kit includes an IR LED (clear) and a 38.5 kHz detector. In
order to prevent “spill” from the LED, it should be placed in a protective shield as
shown in the diagram above.