28119 Parallax Inc, 28119 Datasheet - Page 91

• 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

Building the Infrared Object Detection Circuit
To make this circuit work properly, the infrared LED and detector should both point
forward.
√
√
√
√
P8
P7
Build the circuit shown in Figure 7-3 and Figure 7-4. If you are using a BASIC
Stamp HomeWork Board omit the 220 Ω resistor and make the necessary
connection with a jumper wire.
Connect the CH1 probe to the jumper wire between the LED and resistor.
Connect the CH2 probe to the jumper wire at the junction of P8 and the infrared
receiver.
Connect Ground probe to the jumper wire in Vss.
Infrared LED Assembly: Your infrared LED should be assembled before using it in a
circuit. There are three parts: the IR LED (emitter), the LED Standoff (large cylinder) and
the LED Light Shield (small cylinder).
1.
2.
Insert the IR LED into the Standoff so that its pins come through the small holes in the
bottom. The IR LED should snap into place.
Snap the Light Shield onto the end of the Standoff over the IR LED.
220
Ω
LED
Vdd
Vss
OPTA
OPTA
OPTA
scope
scope
scope
CH2
CH1
GND
Figure 7-3:
Infrared object
detection circuit
schematic.
Note: If you are using
the BASIC Stamp
HomeWork Board
leave the 220 Ω
resistor out of the
circuit – it is already
installed between the
I/O pin and the
connection header.