Dtmfout - Parallax BASIC Stamp II Manual

DTMFOUT

Output DTMF tones.
usage: DTMFOUT pin,{ontime,offtime,}[key,key,key,...]
Pin will be temporarily placed in output mode for modulation. The
default on and off times are 200 ms and 50 ms.
Ontime and offtime are optional overrides in milliseconds.
Key(s) are 0-15, which are the following tones:
0-9 are the digits 0-9
10 is *
11 is #
12-15 are A-D, which are fourth-column codes unavailable on nor-
mal telephones.
The pin may be filtered by an RC circuit to achieve a clean sine-wave.
High-impedance speakers may be driven with a coupling cap and a
filter cap (see below).
Page 32 • BASIC Stamp II Manual 0.94 • Parallax, Inc. • (916) 624-8333
BASIC Stamp II