July 2014

Monday, July 21, 2014

How to make a sewing table

Take a couple filing cabinets, some shelves made out of 2x8s and a 2x4 and end up with a new sewing table.

For a written transcript, go to How to make a sewing table

Music under Creative Commons License By Attribution 3.0.
Intro/Exit: "Hot Swing" by Kevin MacLeod at http://incompetech.com
Incidental: "Airport Lounge" and "Backed Vibes" by Kevin MacLeod at http://incompetech.com


[Harley] In this episode of the House of Hacks, I'm going to be making a table for my wife's new sewing machine from mostly recycled materials.

[Harley] Hi makers, builders and do-it-yourselfers. Harley here. My wife Diane is joining me today as a special guest.

[Diane] Hi. Harley recently got me a new sewing machine and serger.

[Harley] The new machine is designed for quilting and is much larger than the old one.

[Diane] So we had to make some changes to my sewing room for a new workflow.

[Harley] Part of these changes was to make a new table for her sewing machine.

[Harley] This project used mostly recycled items. My employer had a bunch of old stuff they were going to have a scrap company come in and haul off just to get them out of storage. They gave employees first crack at these items so I picked up a bunch of file cabinets designed for cubicles. We used two of them in this project for storage and support on one side.

[Diane] Almost 30 years ago I made some shelves out of 2x8s. They served their purpose well but no longer fit our needs, so we cut them up and used them as the top and one side. A couple 2x4s, bolts and washers were all we purchased. The total project cost was less than $16.

[Diane] Here are the highlights from that project.

[Highlight reel]

[Harley] I hope this project inspires you to use things in slightly different ways than they were originally intended to meet changing needs.

[Diane] Obviously if you need to build a sewing table, what you have available will probably be different from what we had, but perhaps you can find something appropriate to accomplish your task.

[Harley] Thanks for watching. If you enjoyed this overview, I'd appreciate knowing about it with a "like."

[Diane] If you have any thoughts or questions, Harley would love to hear them in the comments below.

[Harley] Until next time, go make something. it doesn't have to be perfect, just have fun!

Thursday, July 10, 2014

Bits of Binary: How to convert between binary and decimal

Learn how to convert from binary to decimal numbers and from decimal to binary numbers.

There's a written transcript for How to convert between binary and decimal.

There's also a playlist for all the Bits of Binary episodes.

Music under Creative Commons License By Attribution 3.0.
Intro/Exit: "Hot Swing" by Kevin MacLeod at http://incompetech.com


If you don't get this classic joke, by the end of this episode you should. Today I explain how to convert binary to decimal, and back again, here at the House of Hacks.

Hi Makers, Builders and Do-It-Yourselfers. Harley here.

In the last two episode of Bits of Binary, I introduced alternate number systems in general and the binary system in particular. Next I showed how you can use binary to count much higher than ten on just your fingers. I closed with the question "How high can you count in binary on both hands?" If you came up with the answer 1023, you really understand the basics.

In this episode in the series, I'm going to show how to convert from binary to decimal and from decimal to binary.

Last time, I explained how each column in a number is the base number raised to a power times the value of the column. That sounds more complicated than it is. In our familiar base 10, or decimal, system, the columns are 10^0, 10^1, 10^2 and so forth. This gives us columns that represent units, tens, hundreds and so on. To get a specific number, say 123, you simply multiply the number in the column by the column's value. Or (100 * 1) + (10 * 2) + (1 * 3). Applying this principal to binary, the columns are 2^0, 2^1, 2^2 and so forth. Giving us 1, 2, 4, 8 and on up.

So, let's convert from binary to decimal. What's the decimal value of the number 10101? Given that each column represents a power of two and each column can only have a value of 0 or 1, this means its value is (2^4 * 1) + (2^3 * 0) + (2^2 * 1) + (2^1 * 0) + (2^0 * 1). Removing the items multiplied by zero gives us (2^4 * 1) + (2^2 * 1) + (2^0 * 1). Evaluating the exponents gives us (16 * 1) + (4 * 1) + (1 * 1). And all this simplifies to 16 + 4 + 1 or 21 in decimal.

Now that we know the theory, let's look at some shortcuts. Instead of looking at the columns as 2 to a power, we can look at them with specific values. Starting with the units column, we know it's one. Each subsequent column is the current column times 2. This gives us 1, 1 * 2 is 2, 2 * 2 is 4, 4 * 2 is 8, 8 * 2 is 16 and so on. Next, all we need to do is write the binary number below the numbers: 10101. And then simply add the values of the columns with 1's in them. 16 + 4 + 1 = 21 decimal.

Binary to decimal is really pretty simple.

Next, let's convert from decimal to binary. This is slightly more complicated, but still not hard.

We need to start with a binary column value larger than our decimal number. So, we start at the right side with one and multiply by two until we have a number larger than what we want to convert. Then working from the left we apply this rule: if the value we want to convert is greater than or equal to the column value, then we set a one for that column and subtract the column's value, otherwise, we set a 0 for that column and continue. The result is then applied to the next column. And we apply the rule until we reach zero.

Let's try the earlier example of 21 decimal. First, find the columns. Start with 1 and double until we have a value greater than 21. Then start from the left and apply the rule. 21 is less than 32 so we write a 0 and move to the next column. 21 is greater than 16, so we write a one below the 16 and subtract 16 from 21 leaving us 5. Next column. Five is less than 8 so we write a zero below 8 and move on. Five is greater than 4 so we set a one below the four and subtract four from 5 leaving us 1. One is less than 2 so we set a zero below the 2 and move to the units. One is equal to one so we set a 1 in the units column, subtract 1 from one leaving us zero and we're done.

If we get to the end without reaching zero, we've done something wrong and need to recheck our work.

Looking at the binary value, we have 10101, which is what we saw in the previous example of binary to decimal, so it all works.

Let's try 24 decimal as another example. 24 is greater than 16, so we set a one below the 16, subtract 16 from 24 leaving us 8. 8 is equal to 8 so set a one below the 8 and subtract 8, leaving us 0. Since we know 0 is less than all the other columns, we can just set them to 0 and be done. This leaves us 11000 binary.

That's all there is to convert between binary and decimal.

I've created a playlist over here that contains all the episodes in this series so far and will be filled in as more are added.

Thanks for watching and if you learned something, I'd appreciate a thumbs up If you have any questions or comments, leave them below. I try to respond to all of them.

So until next time, go make something. It doesn't have to be perfect, just have fun!