Future project Ideas

[pedja089]

Look in manual for COUNT.
Also you can start counting when another switch on rotary is closed.(It should be closed when rotary dial is moved from home position)

[andybarrett1]

Thank you pedja089

That might just do it :-)

BR
Andy

[mpgmike]

You could use a Timer that is set for a little longer than the span between pulses. Each pulse resets the timer and increments the counter. When the Timer times out, lock in your Counter as your number value and turn off the Timer. Loop waiting for a next incoming pulse, restart the Timer and start again. Have a second variable that increments with each saved value. If you normally use 7 digits (that would be a local call in the US), initiate the call after 7 number entries. You could also use a second timer that automatically dials when increments of 7 or 10 digits have been entered and the second Timer expires. As for the initiation of the dialing, I know there is a way to use TONEs to create dual tones (modern method of creating a number), but I don't know enough about telephone systems to know much more.

[Art]

You’ll need debounce which might as well be done is software. The probably eliminates using COUNT unless you do hardware debounce.
I never got a very reliable DTMF out of PBP, even with 20MHz crystal.
If you can go higher, you might get something decent out of DTMFOUT or FREQOUT.
I set the entire phone number to be dialled into an array, and output all of the DTMF at once after a period of inactivity of the dial.

There is also a HOME switch in the dial that is open whenever the dial isn’t in the home position that allows you to end your count
with confirmation that no more pulses are coming, and to look to start counting the next digit dialled.

[andybarrett1]

Thank you again all !!

Have already reasoned the de-bounce issue.... Old slow contacts, so fairly big unit of capacitance needed to dampen!

Also a Schmitt trigger to shape the final signal a bit better...All in hardware..... I am a hardware guy !

At moment ideas are in my pad and head... will be attempting breadboard soon.

Will keep you posted of progress.


Thank you all for input

BR
Andy

[Dave]

Andybarrett1, I would try an MC14490 hex debouncer.

[andybarrett1]

Hi Dave

I did see this chip ..... However the price is unreal as to a couple of caps / resistors and a Schmitt.

Question :-Would I need the Schmitt as the Inputs on most uChips seem to have one built in ?

BR
Andy