Help DS18B20

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alright, watched video tutorial on chip, pretty one.

#1 : don't own arduino "yet". i'm studying little first, see if want purchase one.

i don't understand things.



ds18b20 datasheet

alright, tutorial got from. getting temp ds18b20 attiny & control relay [anything arduino] ep.10



so, group c, red. lsb (least significant byte), reads 1f.

1 in 16's place, , f in 1's place. 1x16 = 16, f 15 x 1 = 15.
15 + 16 = 31. hexadecimal.

so, group c, green. msb (most significant byte), reads 1.
1 in 1's place, 1 x 1 = 1.
all now.. 1 msb , 31 lsb.

then in video says multiply msb 256, green highlighted one, hex : 1
1 x 256 = 256.

add them says.. 256 + 31 = 287

then little bit further video, says each degree (°c) 16.

so thought myself, wonder happen if divided 287 16.

287 / 16 = 17.9375

hmmm.. looks data output got celsius (shows : 17.94 °c)

so i'm gonna take guess , rounded thousandths place.


why have multiply msb 256?
why when divided 287 16, did tempature in celsius?



i watched video..

hexadecimal math - comptia network+ n10-006 - 5.2


and still don't understand.

it's clear know little bit binary, , hexadecimal, , know how convert numbers base 62, can't figure out.


could help..?
did post in right section, i'm new arduino, , official forums arduino.

thanks.

oh, come on. spend $6.89.


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