28123 Parallax Inc, 28123 Datasheet - Page 92

• 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

ACTIVITY #4: TWO PUSHBUTTONS CONTROLLING TWO LED CIRCUITS
Let’s add a second pushbutton into the project and see how it works. To make things a
little more interesting, let’s also add a second LED circuit and use the second pushbutton
to control it.
Pushbutton and LED Circuit Parts
(2) Pushbuttons – normally open
(2) Resistors - 10 kΩ (brown-black-orange)
(2) Resistors – 470 Ω (yellow-violet-brown)
(2) Resistors – 220 Ω (red-red-brown)
(2) LEDs – any color
Adding a Pushbutton and LED Circuit
Figure 3-12 shows a second LED and pushbutton circuit added to the circuit you tested in
the previous activity.
Your Turn – Faster/Slower
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√
√
√
√
Save the example program under a different name.
Modify the program so that the LED flashes twice as fast when you press and
hold the pushbutton.
Modify the program so that the LED flashes half as fast when you press and
hold the pushbutton.
Build the circuit shown in Figure 3-12. If you need help building the circuit
shown in the schematic, use the wiring diagram in Figure 3-13 as a guide.
Modify ReadPushbuttonState.bs2 so that it reads
to test your second pushbutton circuit.
IN4
instead of
IN3
, and use it