How to Implement 1-wire Devices

[C]

Think of C as if it is a smart assembler. This is what it started as.

A pointer is just an address like you would have used on Z80

Z80 assembly can work with many data types, in C you state type.

In C you also get higher level things you find in basic.



https://www.arduino.cc/reference/en/

http://www.cplusplus.com/

[Docara]

Hi

After looking through sample code which implements the Search Algorithm I think it is way beyond my programming skills to implement. I can't even get a picture in my mind of how it works - which is, I guess, half the battle to start coding. The techniques that have been used just don't make any sense to me, and I just don't know how to proceed from here.

I have contacted Maxim and submitted a product request for the full S.A. to be implemented in their family of line drivers - the DS2480B being a member. They already do it in their USB to 1-wre chip.

Anyway thank you all for you replies to my question.

Dave mate if you're reading this perhaps a tutorial is in order

Matt

[C]

With your limited program ability, you might want to work on this part first.

If you were to get a Raspberry PI you could work on your software knowledge &
Their is a very simple software interface from the Raspberry PI to One-Wire. The actually communications to/from One-Wire is all written. Your software would be working with files & folders. In addition you could have access to many software languages.


The One-wire has a 64 bit ID

One way is to translate to something you might understand.
Convert this to a directory tree

Think of the ROM_Scan function telling you of existence of two possible folders in a path.

Rom_Scan starts from the LSB and works to MSB
So reading the first 8-bits gives you the family code.

18B20 has family code of 28H which is 0b101000
With only some 18B20's on bus, if you convert  to a windows path you get a path starting with
"0\0\0\1\0\1\0\0"

When Rom_Scan checks first bit you get
0 bit exists = a folder with folder_name = "0" exists
1 bit does not exist = a folder with folder_name = "1" does not exists
when checking the 4'th bit you get 1 exists No 0

After first 8 you start reading the serial number and the CRC.

Now if you had something else with a different family code in addition to 18B20's, one or more of those bit answers would have
0 exists & 1 exists

Any time you get this both exists, you need to remember one path and keep searching other path.

Now if you drop the FLOWCODE

You could just use a ESP32
This will give you a lot of simple options.
You could have a WIFI Web page for 18b20's and more
You could still have serial connection
You could still have CAN

Do a YouTube search of
"esp32 arduino 18b20"

There are a huge number of results.
And some are specific to having many 18B20  temperature sensors

Starting from low end micro-controller can be much harder then starting from HIGH that you can modify to make it match what you want.