Help DS18B20

Projects Programming
1

Alright, so I watched a video tutorial on this chip, pretty good one.

#1 : I don't own an Arduino "yet". I'm studying a little first, to see if I want to purchase one.

I don't understand some things.

DS18B20 Datasheet

Alright, so this is the tutorial I got it from. Getting Temp from DS18B20 to an ATtiny & control a relay [Anything Arduino] ep.10

So, Group C, Red. is LSB (Least Significant Byte), which reads 1F.

1 is in the 16's place, and F is in the 1's place. 1x16 = 16, F is 15 x 1 = 15.
15 + 16 = 31. Hexadecimal.

So, Group C, Green. is MSB (Most Significant Byte), which reads 1.
1 is in the 1's place, so 1 x 1 = 1.
All together now.. 1 MSB and 31 LSB.

Then in the video he says to multiply the MSB by 256, green highlighted one, which is hex : 1
1 x 256 = 256.

Add them together he says.. 256 + 31 = 287

Then a little bit further into the video, he says that each degree (°C) is 16.

So I thought to myself, I wonder what would happen if I divided 287 by 16.

287 / 16 = 17.9375

Hmmm.. That looks like the data output he got for Celsius (Shows : 17.94 °C)

So I'm gonna take a guess and say it rounded the thousandths place.

Why do I have to multiply the MSB by 256?
Why when I divided 287 by 16, did I get the tempature in Celsius?

I also watched this video..

Hexadecimal Math - CompTIA Network+ N10-006 - 5.2

And I still don't understand.

It's clear that I know a little bit about binary, and hexadecimal, and I even know how to convert numbers to Base 62, but I can't figure this out.

Could someone help..?
Did I post in the right section, I'm new to Arduino, and the official forums for Arduino.

Thanks.

SERIAL OUTPUT.jpg
SERIAL OUTPUT.jpg1133×554 79 KB

2

Oh, come on. Spend the $6.89.

3

Idk why I can't post images on here, I'm not a bot.

It's the serial output, that I'm talking about.

I probably will purchase one, I mean god knows I have the money, and it's a very cool device I can do all kinds small stuff with.

4

Young_Grasshopper:
I also watched this video..
Hexadecimal Math - CompTIA Network+ N10-006 - 5.2
And I still don't understand.

No surprise there.

I submit the best thing you can do is keep the datasheet, you may need as a reference, and forget all that other stuff, it's all hogwash.

A suggested to do list might be

Get a Uno, or if you have some ambitions, a Mega

Get a couple of DS18B20
http://www.ebay.com.au/itm/DS18B20-Temperature-Temp-Sensor-Thermal-Probe-Thermometer-Waterproof-For-Arduino-/161952069032?var=&hash=item25b51875a8:m:mmqtfAJA--h_f4xcT5hKZ-w

Get the Dallastemperature library for your Arduino- Google it

Go here for a tutorial

5

Nick_Pyner:
No surprise there.

I submit the best thing you can do is keep the datasheet, you may need as a reference, and forget all that other stuff, it's all hogwash.

A suggested to do list might be

Get a Uno, or if you have some ambitions, a Mega

Get a couple of DS18B20
http://www.ebay.com.au/itm/DS18B20-Temperature-Temp-Sensor-Thermal-Probe-Thermometer-Waterproof-For-Arduino-/161952069032?var=&hash=item25b51875a8:m:mmqtfAJA--h_f4xcT5hKZ-w

Get the Dallastemperature library for your Arduino- Google it

Go here for a tutorial
Arduino 1-Wire Tutorial

Thanks, I'll do that.

Thanks for the help Nick_Pyner.