This
is a versatile & secure circuit for any home, whole circuits is explain of
my post DTMF Remote Control GSMBased .In
this project you will need a mobile phone where you can set your own ring tone.Then
you have to record any DTMF tone , lets record number
3 tone in mobile direct or by PC , transfer this tone to the mobile (circuit Mobile),Now
set this tone as a ring against all the family member stored in mobile,It
means that if any family member will call the mobile DTMF tone of # 3 will heard
from mobile ,.Now
this mobile is connected with circuits (DTMF Remote Control GSMBased),All
process is same like my post (DTMF Remote Control GSMBased).But
in this condition due to the same tone from all the family mobiles will be the
same output ( tone) from the BCD 4028, like Tone 3 will be taken from pin 15 of 4028. Other caller will not be entertained having no
any assigned DTMF tone. This circuits can be connected with main gate lock , where only family
can access .
