DuinoMite: Working with 1-wire devices


Image

Maxim-Dallas iButton 1-wire devices are widely used in security, timekeeping, temperature measuring and so on applications.

Gerard Sexton added iButton 1-wire support for DuinoMite so I decided to try it today.

We used to produce car immobilizers 20 years ago (when I type this I feel old🙂 ) so I found in our stock one iButton receptacle and Dallas DS1990 ROM button.

Image

and wrote simple code to test it:

10 SETPIN 1,8 ‘LED output

as the receptacle have LED on it I decided to drive the LED with PIN(1) and to read the iButton with PIN(18) which is open collector

20 dim ar(10) ‘read iButton info

this defines the array where the read iButton info will be stored, later we can save this on file or to “learn” it and if later matched to open door lock, unlock car etc.

30 p = 18 ‘PIN(18) is used as iButton read as Open collector
40 PRINT “TOUCH iBUtton Please!”

now we are set and wait button to be pressed to the receptacle:

50 owreset p,presence ‘check for present
60 if presence = 1 then gosub 100 ‘if present read and display it
70 goto 50

if button is present the variable PRESENT =1 else 0

when the button is detected we write the info on the screen and blink the LED for 1/2 second:

100 ? “iButton detected:”;
110 owsearch p,1,ar(0): FOR I = 1 to 8: ? HEX$(AR(I));” “;:NEXT I: ?
120 PIN(1)=1: PAUSE 500: PIN(1) = 0 ‘blink the LED
130 RETURN

now let’s see what happend when we run this code:

Image

success, Well done Gerard!

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: