Purpose of our course project is to develop DTMF signal controlled house monitoring
system based on PIC Microcontroller. The device is connected to phone line and is controlled by
DTMF signal emitted by DTMF encoder in stationary or mobile phones. In presence of incoming
call the device pick-up the phone and answer the call connecting to the line. User can press
buttons and control the system remotely. Function of keys should be known initially (read
manual in appendix B). The functions are:
· speakerphone monitoring (you can listen the sound in remote premise),
· room temperature monitor (sound indication),
· output for heating switch (we can turn on/off the external heating),
· input for security check (if it was alarmed, the input must be high),
· alarm controller (we can activate alarm system manually),
· automatic pick-up (raises after 4 seconds or could be changed),
DTMF signal controlled house monitoring system
2003 Vilnius
5.
· automatic hung-up (if no buttons are pressed more than 1 minute, it protects from
accidental disconnection from the system, for example out ofradio coverage in
mobile networks),
· monitoring indication is followed by sound signals (read manual).

read full report
http://lukosiusfiles/dtmf_home_automation.pdf