Distinctive telephone Ring

Donwalkworth

I have very limited experience with the BS2 and have not been able to figure this out. I would like the BS2 to tell the difference between a regular telephone ring and a distinctive ring (two short rings). If it is a regular ring the BS2 ignores it but if it is a distinctive ring it "answers" waits for a DTMF "password" and if correct produces a #6 DTMF into the phone line. Any help would be coding and additional info would be greatly appreciated

Franklin

Start with how you plan to answer the phone and transmit the tone before you get into the programming or chip selection.

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- Stephen

lenswerks

This is what I use and may be of some help to you. I interface to the telephone line using a XECOM DAA XE0052SIP. The module has an internal 2-4 wire converter to separate transmit and receive signals. Pin 8 on the module is the ring indicator which can be connected to any Stamp to determine if the telephone is ringing. Pin 3 is OH or hookswitch relay control - A high on OH from your Stamp will connect you to the telephone line - Answer phone.

For decoding tones I use a SSI202P chip, for encoding or dialing out I use the Stamp's DTMFOUT.

If you can put two short rings on the line, then it would easy to determine two short from a standard ring sequence by testing. The code below will answer the phone before first ring has terminated.

I use to buy the DAA devices directly from XECOM in 1 to 5 units at a time, but that has been awhile. I recall they were ~20$. If you want to try using the device you can check their WEB site for ordering.

Once you get something prototyped I'd be glad to help you along.

Donnie

· IF RI = 0 THEN······················ ' Active low indicates phone ringing
·· HIGH OH····························· ' Take phone off-hook - Pin on DAA - Data Access Arrangement
· IF DV = 1 THEN····················· ' DV is pin on 202P indicating a valid tone received when high
··GOSUB AAAA
.
.
············································ 'INB are the 4 pins connected to 202P tone decoder
············································ 'So I am decoding·0-9 + # and *.·The code for 1, 2 and # sign
············································ 'follows.
AAAA:
··· SELECT INB
···· CASE 1·········· ' Turn power to camera ON
····· cmd=0
····· GOSUB Play_Msg
····· AUXIO
····· XOUT Mpin, Zpin, [noparse][[/noparse]HouseA\Unit2\2, HouseA\UNITON]
····· MAINIO
····· SEROUT pTX, Baud, [noparse][[/noparse]"!NB0W26:ON", CLS]
····· SEROUT pTX, Baud, [noparse][[/noparse]"!NB0W00:", HEX 1, CLS]
···· CASE 2·········· ' Turn power to camera OFF
····· cmd=0
····· GOSUB Play_Msg
····· AUXIO
····· XOUT Mpin, Zpin, [noparse][[/noparse]HouseA\Unit2\2, HouseA\UNITOFF]
····· MAINIO
····· SEROUT pTX, Baud, [noparse][[/noparse]"!NB0W26:OFF", CLS]
····· SEROUT pTX, Baud, [noparse][[/noparse]"!NB0W00:", HEX 0, CLS]
.
.
.
···· CASE 12································· ' A #·which is·decoded as 12·terminates the conversation.
····· cmd=1
····· GOSUB Play_Msg
····· LOW OH································ ' Place phone on-hook - HANG-UP

A timer is started after each tone is received that allows ~30 seconds to key the next tone before the Stamp will terminate the call.