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Programming the BS2 to decode DTMF using a CM8870 receiver IC — Parallax Forums

Programming the BS2 to decode DTMF using a CM8870 receiver IC

comtechcomtech Posts: 1
edited 2009-12-11 03:11 in BASIC Stamp
Gentlemen - I am new to the BS2 and Pbasic. I am a comtech by trade so telephone systems and interfacing is something I do regularly. What I would like to do is call into one of my remote equipment sites and using a 3 or 4 digit DTMF code, reset a power supply or other piece of equipment. If someone could give me a heads up on how to write the code to read the strobed 4 bit data from the CM8870 and momentarily operate an I/O pin·I would appreciate it.

Thanx - Jeff.·

Comments

  • FranklinFranklin Posts: 4,747
    edited 2009-12-11 03:11
    It looks like you hook Q1 -4 to a set of pins on the stamp like 0-3 or 4-7 and read them when the device says they are latched and before they are changed by the next set of tones.

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    - Stephen
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