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Posted by swati s. zambre (61.1.92.239) on August 14, 2003 at 03:47:40:
In Reply to: Re: Home Automation - Controlling Over Phone Line posted by Tomi Engdahl on May 31, 2003 at 12:33:46:
: : Dear Sirs
: : I am developing a CPU 8051 based in order to perform control on my home. I have a PABX and the idea is to connect CPU on ramal of PABX. So, I am needing :
: : - Telephone Front End Circuit to
: : - Connect the CPU on Phone LIne
: Read http://www.epanorama.net/circuits/teleinterface.html
: : - Detect the ring tone.
: You need to detect the ring signal on the line.
: You can find examples how to make this at:
: http://www.epanorama.net/circuits/telephone_ringer.html
: and http://www.epanorama.net/links/telephone.html#circuits on "Ring detectors" section.
: : - After 3 rings, pick up the ~phone~ and read the DTMF tones.
: Software to do this is around this:
: 1. Wait for ring signal to activate (for first ring)
: 2. Wait for ring signal to end
: 3. Wait for ring signal to activate (for second ring)
: 4. Wait for ring signal to end
: 5. Wait for ring signal to activate (for third ring)
: 6. Wait for ring signal to end
: 7. Turn on the line hook relay to pick up phone
: 8. Read DTMF data from DTMF decoder
: : I am using the MT8870 IC to read the DTMF tones. BUt I dont know how to connect it on phone line (I am needing a circuit)
: : So, I am developing a smart phone capable of control lights, alarms, moving sensor, CCTV sequential, and so on. All over phone line.
: : Please help me.
: The page http://www.epanorama.net/links/telephone.html#circuits has links to telephone based remote controlling circuits quite similar what you need at "Remote controlling using telephone" section.
: Those should cover at least the controllign section. Relays activated through telephone line can control practically anything that need on/off control.
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