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Replaced stock photos, deleted old images.

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Added examples of wrist watch designs. Some typo corrections.
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dkiang
2017-08-01 13:33:03 -07:00
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docs/courses/csintro/binary.md
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# Binary
![Binary numbers shown on a monitor](/static/courses/csintro/binary/binary-crt.png)
This lesson presents the concept of binary digits and base-2 notation. Students will learn how data is stored digitally and how it can be read and accessed.
## Lesson objectives
Students will...
* Understand what a bit and byte are and how they relate to computers and the way information is processed and stored.
* Understand what bits and bytes are and how they relate to computers and the way information is processed and stored.
* Learn to count in Base-2 (binary) and translate numbers from Base-10 (decimal) to binary and decimal.
* Apply the above knowledge and skills to create a unique program that uses binary counting as an integral part of the program.

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docs/courses/csintro/binary/project.md
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* To make the strap of the wristwatch, put 2 pieces of duct tape back-to-back, and use velcro tabs as the fasteners
![Binary wrist watch project](/static/courses/csintro/binary/binary-wrist-watch.jpg)
To make the strap of the wristwatch, you can put two pieces of duct tape back-to-back, and use Velcro tabs as the fasteners.
![Holder](/static/courses/csintro/conditionals/holder.jpg)
This is a holder that allows the micro:bit to be worn on the wrist.
![Wooden structure to hold the micro:bit on the wrist](/static/courses/csintro/conditionals/microbit-holder.jpg)
This design supports the micro:bit in a rigid cradle and allows more delicate connections to the pins.
## Reflection
Have students write a reflection of about 150–300 words, addressing the following points:

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docs/courses/csintro/binary/unplugged.md
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You can also just make a very simple vending machine diagram like the one below:
![Vend-o-matic diagram](/static/courses/csintro/binary/vendomatic.jpg)
![Vend-o-matic diagram](/static/courses/csintro/binary/vendomatic.png)
### ~
## Introduction
Ask the students the following questions to spark discussion:
@@ -105,7 +105,7 @@ Hand out the 32 unit coins, one to each student or pair of students.
* What is the new maximum price you could pay for an item? _63_
* What combinations of coins can you use to pay for an item priced from 32 units to this new maximum price?
![Coins representing binary digits](/static/courses/csintro/binary/coins-as-digits.jpg)
![Coins representing binary digits](/static/courses/csintro/binary/binary-place-values.png)
From coins to binary notation - the number 45
Once students are comfortable making combinations of numbers, encourage them to use ones and zeroes to represent the numbers instead. This number system uses the number 2 as its base (each place is two times the one before it.) It is called the Base-2 system, or binary system. The number system we are normally familiar with is the Base-10 system, or decimal system (each place is ten times the one before it.)