28123 Parallax Inc, 28123 Datasheet - Page 324
![TEXT WHAT'S A MICROCONTROLLER](/photos/6/49/64955/mfg_28123_sml.jpg)
28123
Manufacturer Part Number
28123
Description
TEXT WHAT'S A MICROCONTROLLER
Manufacturer
Parallax Inc
Type
Programmingr
Datasheet
1.28123.pdf
(340 pages)
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
- Current page: 324 of 340
- Download datasheet (6Mb)
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
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