View Full Version : phone line interface problem

01-29-2006, 12:52 AM
i have construct this circuit from bs2 book and i define input pin0 and i have put a relay on pin 1
I wrote the code:

HIGHи1ииииииииииииииииииииииииииииииииииииииииииии ииииииииииииииииииии' ON HOOK
DTMF 0,[6,9,7,2,8,9,5,6,1,8]ииииииииииииииииииииииииииииииииии ' CALL 6972-895618 MY MOBILE NUMBER
PAUSE 10000иииииииииииииииииииииииииииииииииииииииииииии ииииииииии ' PAUSE 10sec for wait to call
LOW 1иииииииииииииииииииииииииииииииииииииииииииииииии иииииииииииииии ' OFF HOOK

I connect this on my phone line and the problem where i have is howи i heared call numbers but the line tone is like i don;t call what i do wrong,

mk:@MSITStore:C:\Program%20Files\Parallax%20Inc\St amp%20Editor%20v2.2.5\PBASIC.chm::/graphics/daa_sch.gif

Jon Williams
01-29-2006, 12:59 AM
It's always very tricky connecting directly to a phone line and, in fact, it's not legal without FCC (in the US, anyway) approved equipment -- called a DAA. For your experiments, you might try modifying the DTMF timing so that your "buttons" are being pressed longer; if the line or interface quality is suspect, this will give the receiving end more time to decode the DTMF digit.

Jon Williams
Applications Engineer, Parallax

Chris Savage
01-29-2006, 01:04 AM
Another thing that could just be mis-worded comments is it says your code putting the phone ON HOOK before dialing.и It should be OFF HOOK or else the line will never get the tones.

Chris Savage
Parallax Tech Support
csavage@parallax.com (mailto:csavage@parallax.com)