28176 Parallax Inc, 28176 Datasheet - Page 138

• Manufacturer Part Number: 28176
• Description: KIT PARTS PROCESS CONTROL W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28176

• Accessory Type: Process Control
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Additional Components Required:
(1) 2N3904 Transistor
(1) 220 Ω resistor
(1) 1 kΩ resistor
Figure 4-26 Opto-Reflective Switch Using Darlington Pair - Schematic
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Leave the ADC circuit on the board. It is not used in this activity but will be
again later. It is not shown in the schematic but remains in the wiring diagram.
Modify the circuit as shown in Figure 4-26 and Figure 4-27.