28123 Parallax Inc, 28123 Datasheet - Page 324

• 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

BONUS ACTIVITY: OHMS LAW, VOLTAGE, AND CURRENT
This activity applies some of the definitions just discussed.
Ohm’s Law Parts
(1) Resistor – 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) LED – any color
Test Circuit
The resistance value of R
current through the LED, and it glows more brightly. Higher resistance values will cause
the LED to look dim because they do not allow as much current to pass through the
circuit.
√
√
√
√
Disconnect power to your Board of Education or HomeWork Board whenever
you modify the circuit.
Build the circuit shown starting with a 220 Ω resistor.
Modify the circuit by replacing the 220 Ω resistor with a 470 Ω resistor. Was
the LED less bright?
Repeat using the 1 kΩ resistor, then the 2 kΩ resistor, checking the change in
brightness each time.
i
in Figure F-1 can be changed. Lower resistance allows more