1 wire Programs
I had also published Secure Digital Access system using iButton in Construction section of Electronics for You magazine, November, 2010 issue.
It was on Bascom AVR compiler
3 comments on 1 wire Programs:
I have a project to do a one wire bus connect between the mbed microcontroller to ibutton Ds1990A. I Put the schematic in the attachment. Do you have the code for this application? I connect rx(Pin 14,mbed)-? Return(Blue,ibutton)tx(Pin 13)-Data(Green,ibutton)
Could you check? 
Sorry Your schematic is wrong, as DS1990A requires only one wire connections and another is ground.
E.G. if you take Pin 14 as data pin for 1 wire device DS1990A then GND is for another.
If there is any questions check my 1 wire program. ok.
If you are giving me some credit then i can help you more on it.
Can I use Return(Blue)=Pin 20 and Data (Green)=Vout (3.3V)?
Where is your 1-wire program?
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I have a project to do a one wire bus connect between the mbed microcontroller to ibutton Ds1990A. I Put the schematic in the attachment. Do you have the code for this application? I connect rx(Pin 14,mbed)
-? Return(Blue,ibutton)tx(Pin 13)-Data(Green,ibutton) Could you check?