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The second project utilizes the CM8880 DTMF encoder/decoder and the STAMP 2 to form a touch-tone decoder display project, shown in Fig. 10-3. This decoder/display unit will allow you to monitor touch-tone signals, decode the phone numbers dialed, and display the number on a serial LCD display. This project can be placed across the phone line to capture phone numbers, or it could be used with a radio transceiver to monitor access tones sent over the air and display the captured numbers on the display. The touch-tone decoder project uses the CM8880 in the decoder mode. The tone signals are received via C1 and C2, using the balanced input network shown in Fig. 10-4. The STAMP 2 animates the control pins 9, 10, and 11, and accepts the binary output of the CM8880 via pins 14 through 17. The LCD panel is driven by the BASIC STAMP 2 on pin 7. The program accepts numbers and displays them sequentially, and if the delay between characters is too longs then the display will show a space until another stream is decoded. Power switch
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Figure 10-3 Touch-tone decoder display project, as assembled.
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R2 R3 R4 R5
2 3 4
18 17
16 15 14 13 12 11
U2 Stamp 2
23 22 21 20 19 18 17 16 15 14 13
CM8880
7 8 9 10
5V R7
7 8 9 10 11 12
LCD-LX In
9 12Vdc
Figure 10-4 Touch-tone decoder with display.
TOUCH-TONE GENERATOR/DIALER PARTS LIST 143
S1 applies 5 V to the STAMP 2 via the 5-V regulator at U3. Momentary pushbutton S2 is the system reset button, which is used in the event of a system lockup. You will need to locate or build a 9- to 2-Vdc power supply in order to power the radio DTMF controller. You can elect to build a power supply or try to locate a wall wart power supply from a surplus electronic supplier. The circuit can be assembled on a custom circuit board, a perfboard, or a BASIC STAMP 2 carrier board, and then mounted in a small plastic enclosure box to protect the circuit board. The power switch S1 and the reset switch S2 are placed on the front of a plastic enclosure along with the serial LCD display unit. A two-circuit jack for the audio input is placed at the rear of the plastic case along with the hole and grommet for the serial programming connector. Once the circuit has been mounted in an enclosure, you are now ready for the smoke test. Connect your programming computer to the DB-9 connector and apply power to the touch-tone decoder/display unit and you re ready to begin. Next locate the STAMP 2 Windows editor titled STAMPW.EXE. Now locate the DTMF_RCV .BS2 (Listing 10-2) program and download it into your touch-tone decoder/display circuit, remove the programming cable, and you re ready to sniff the phone line or radio waves, looking for touch-tone numbers. The radio DTMF controller can be used for a number different applications. We ve only illustrated two; your imagination may devise more. Our project utilizes a VHF/UHF ham radio transceiver, but a scanner could have been used for the receiver. This circuit could also be adapted to Family Radio Service (FRS) or the long-range General Mobile Radio Service (GMRS) radios if desired.
Touch-Tone Generator/Dialer Parts List
U1 U2 U3 U4 R1 R2, R5 R3 R4 R6 R7 C1 C2, C3, C7 C4, C6 CM8880 touch-tone encoder/decoder IC BASIC STAMP 2 (original) LM 7805 5-V regulator IC LM358 op-amp 100-k 10-k 390-k 3.3k10-k 22-k
1 1 4-W
resistor
4-W resistor 1 4-W resistor 1 4-W resistor
potentiometer
1 4-W
resistor
0.1- F 250-V polyester capacitor 0.1- F 35-V disk capacitor 2.2- F 35-V electrolytic capacitor
144 RADIO DTMF TONE DECODER AND DISPLAY
C5 XTL S1 S2 P1 Miscellaneous
10- F 35-V electrolytic capacitor 3.579-MHz color burst crystal SPST toggle switch SPST pushbutton switch (normally open) DB-9, nine-pin female RS-232 connector Circuit board, headers, wire, jack, plugs
Touch-Tone Decoder/Display Parts List
U1 U2 U3 R1, R2, R5 R3 R4 R6 R7 C1, C2 C3, C4 C5 XTL S1 S2 LX P1 Miscellaneous CM8880 touch-tone encoder/decoder IC BASIC STAMP 2 (original) LM7805 5-V regulator 100-k 37.5-k 60-k 390-k 10-k
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