28123 Parallax Inc, 28123 Datasheet - Page 152

• Manufacturer Part Number: 28123
• Description: TEXT WHAT'S A MICROCONTROLLER
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28123

• Style: Book
• Title: What's a Microcontroller?
• Contents: Whats a Microcontroller? Text
• Product: Microcontroller Accessories
• Core Processor: PIC16C57c
• Flash: 128 Bytes
• Operating Supply Voltage: 9 V
• Board Size: 31 mm x 16 mm
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Resistance and Time Parts
(1) Capacitor – 3300 µF
(1) Capacitor – 1000 µF
(1) Resistors – 220 Ω (red-red-brown)
(1) Resistor – 470 Ω (yellow-violet-brown)
(1) Resistor – 1 kΩ (brown-black-red)
(1) Resistor – 2 kΩ (red-black-red)
(1) Resistor – 10 kΩ (brown-black-orange)
Building and Testing the Resistance Capacitance (RC) Time Circuit
Figure 5-8 shows the circuit schematic and Figure 5-9 shows the wiring diagram for this
activity. You will be taking time measurements using different resistor values in place of
the resistor labeled R
√
With power disconnected, build the circuit as shown starting with a 470 Ω
resistor in place of the resistor labeled R
Recommended Equipment: Safety goggles or safety glasses.
SAFETY
Always observe polarity when connecting the 3300 µF capacitor.
negative terminal is the lead that comes out of the metal canister closest to the stripe with a
negative (–) sign. Use Figure 5-7 to identify the (+) and (-) terminals.
Your 3300 µF capacitor will work fine in this experiment so long as you make sure that the
positive (+) and negative (-) terminals are connected EXACTLY as shown in Figure 5-8 and
Figure 5-9.
Never reverse the supply polarity on the 3300 µF or any other polar capacitor. The
voltage at the capacitor’s (+) terminal must always be higher than the voltage at its (-)
terminal. Vss is the lowest voltage (0 V) on the Board of Education and BASIC Stamp
HomeWork Board. By connecting the capacitor’s negative terminal to Vss, you ensure that
the polarity across the capacitor’s terminals will always be correct.
Wear safety goggles or safety glasses during this activity.
Always disconnect power before you build or modify circuits.
Keep your hands and face away from this capacitor when power is connected.
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Remember, the