interfacing ibutton to PC using USB

K

konzen

New Member

• May 12, 2008

• #21

I'm back guys, just met my supervisor today and I proposed building the circuit but he said he still wants to me to do it with a microcontroller. the part family will be PIC18F2525/2620/4525/4620 because there are surplus in the labs. I have no prior knowledge of doing this but upon searching online, I think I might follow something like this



Really lost now have to do more research and time is running short.

 

N

nickelflippr

Member

• May 12, 2008

• #22

The Rentron example is more complicated than necessary, as it involves a one-wire network. If just one i-button is sufficient, then a bare bones approach would be better to start.

As Blueroom suggests, getting a one-wire interface built from scratch is a hassle https://translate.google.com/transl...?q=microchip+DS1990A+code&start=30&hl=en&sa=N. Perhaps if you are lucky, a search will find an example for whatever language you are going to use.

 

K

konzen

New Member

• May 12, 2008

• #23

Okay, like you mentioned, I'll opt for the barebones approach. I've included a diagram below.

Anything else I need to know on the hardware side? So far I've read up on the oscillator and as for power I'll be using a regulated voltage supply available in the uni lab in the meantime. Btw I've watched all the tutes in the MCU newbie thread.

Anything else regarding the hardware side? Thanks abunch.

 

Attachments

• MCU.JPG

  9.3 KB · Views: 226

blueroomelectronics

Well-Known Member

• May 12, 2008

• #24

You need a common ground but that's the basic circuit.

 

P

Pommie

Well-Known Member

Most Helpful Member

• May 12, 2008

• #25

I would suggest you use Swordfish basic. If you do a search here for Swordfish and DS1820 you should find a few useful threads. I wrote some code in this thread that shows how to read the ID of a one wire device. You might also want to check out **broken link removed**.

Mike.

 

K

konzen

New Member

• May 12, 2008

• #26

I know. anything else to consider before setting the circuit up? I just need it to function in the most basic way at 4 MHz.

 

K

konzen

New Member

• May 13, 2008

• #27

Thanks Pommie. Will check it out