28123 Parallax Inc, 28123 Datasheet - Page 89

• 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 #3: PUSHBUTTON CONTROL OF AN LED CIRCUIT
Figure 3-10 shows a zoomed in view of a pushbutton and LED used to adjust the settings
on a computer monitor. This is just one of many devices that have a pushbutton that you
can press to adjust the device and an LED to show you the device’s status.
The BASIC Stamp can be programmed to make decisions based on what it senses. For
example, it can be programmed to decide to flash the LED on/off ten times per second
when the button is pressed.
Pushbutton and LED Circuit Parts
(1) Pushbutton – normally open
(1) Resistor - 10 kΩ (brown-black-orange)
(1) LED – any color
(1) Resistor – 220 Ω (red-red-brown)
(1) Resistor – 470 Ω (yellow-violet-brown)
(2) Jumper wires
Building the Pushbutton and LED Circuits
Figure 3-11 shows the pushbutton circuit used in the activity you just finished along with
the LED circuit used in Chapter #2, Activity #2.
Figure 3-10
Button and LED on
a Computer Monitor