DTMF in time?
Hi
Can anyone tell me how can i use BS-2 to get DTMF during a certain
time, eg to recieve 4 tone digits from telephone line within 30sec
as a password or hangup the line. I know how to do it using intrupt
for pic f16x84, But since BS-2 has no intruppt. Thanks.
Can anyone tell me how can i use BS-2 to get DTMF during a certain
time, eg to recieve 4 tone digits from telephone line within 30sec
as a password or hangup the line. I know how to do it using intrupt
for pic f16x84, But since BS-2 has no intruppt. Thanks.
Comments
There is a chip ( holtek ht9170 ) and others that can read dtmf it
also has DV output which is data valid when this goes high a valid
tone has been detected interrupt would be handy here. but if you use a
number of gosubs to a if statement checking for high DV you may be
able to work this out guess it depends on what the stamp has to do.
salahss@h... wrote:
>
> Hi
> Can anyone tell me how can i use BS-2 to get DTMF during a certain
> time, eg to recieve 4 tone digits from telephone line within 30sec
> as a password or hangup the line. I know how to do it using intrupt
> for pic f16x84, But since BS-2 has no intruppt. Thanks.