28176 Parallax Inc, 28176 Datasheet - Page 87
28176
Manufacturer Part Number
28176
Description
KIT PARTS PROCESS CONTROL W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28176.pdf
(330 pages)
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
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Figure 3-23 (top): Higher-voltage digital signals can be interfaced using a 74HC4050
buffer or 74HC4049 inverter powered at +5 volts. These devices can safely handle inputs
up to 15 volts. Again, the grounds must be common.
Figure 3-23 (bottom): An opto-coupler may be used to interface different voltage levels
to the BASIC Stamp. The LED’s resistor holds current to a safe level while allowing
enough light to saturate the phototransistor. The input circuit can be totally isolated from
the phototransistor’s BASIC Stamp power supply because they do not need to share a
common-ground. This isolation provides effective protection of each circuit in case of an
electrical failure of the other.
The optical reflective switch will be explored further in Chapter 4.
Figure 3-23
Digital Interface
Circuits
Top: High
Voltage Logic to
BASIC Stamp
Bottom:
Optocoupler to
BASIC Stamp
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