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DPDT RELAY 153
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TABLE 11-2 BINARY VALUE
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DTMF BINARY AND DECIMAL VALUES DECIMAL VALUE KEYPAD SYMBOL
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0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
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D 1 2 3 4 5 6 7 8 9 0 * # A B C
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TABLE 11-3 CS RW
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CONTROL BIT CS, RW, AND RSO STATUS DESCRIPTION
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0 1 0 1 0 1 0 1
Active: write data (i.e., send DTMF) Active: write instructions to CM8880 Active: read data (i.e., receive DTMF) Active: read status from CM8880 Inactive Inactive Inactive Inactive
154 RADIO DTMF TONE DECODER/CONTROL
TABLE 11-4 BIT NAME
FUNCTIONS OF CONTROL REGISTER A FUNCTION
Tone out
tone generator disabled tone generator enabled send and receive DTMF send DTMF, receive call progress tone
Mode control
(DTMF bursts lengthened to 104 ms) 2 Interrupt enable 0 1 3 Register select 0 1 Make controller check for DTMF received Interrupt controller via pin 13 when DTMF received Next instruction write goes to CRA Next instruction write goes to CRB
TABLE 11-5 BIT NAME
FUNCTIONS OF CONTROL REGISTER B FUNCTION
Burst
output DTMF bursts of 52 or 104 ms 1 output DTMF as long as enabled normal operating mode present test timing bit on pin 13 output dual (real DTMF) tones output separate row or column tones if above if above 1 select row tone 1 select column tone
Test
Single/Dual
Column/Row
Silent Radio
Our second application for the remote touch-tone radio decoder, shown in Fig. 11-3, depicts a silent radio scheme. In this application, the radio receiver is kept quiet until the tone sequence is received, and on activation the remote speaker is connected to the radio. The audio from the radio receiver is fed both to the touch-tone decoder and to the input gain control ahead of the audio amplifier at U4. When the proper tone sequence is received, the relay at RLY1 is activated and the audio path from the receiver is connected to audio amplifier at U4, which is used to drive the 8- speaker, and when an important or desired message is received, the speaker comes to life! In this application, the radio or scanner could be placed in the kitchen if desired, and you could use the setup to announce
5V Radio Transceiver C5 Band Tune DB-9 female
7 6 5 4 3 2
O U3
9 12Vdc
Mic Phones
J1 P1 U1 J2 P2 C1 R1 R2 XTL J3 P3 C2 R3
1 2 3 4 5 6 7 8 9 10 In In VDD StGt 20 19 18 17 16 15 14 13 12 11
5V C3 C4 R4
1 2 3 4 5 6 24
TX RX ATN GND P0 P1 P2 P3 P4 P5 P6 P7 P15 P14 P13 P12 P11 P10 P9 P8
CM8880
CS VREF VSS
Est D3 D2 D1 D0 CP F2 RS0
23 22 21 20 19 18 17 16 15 14 13
OSC1 OSC2 Tone R/W CS
R5 R6
7 8 9 10 11
5V RLY1 Door opener
1 2 3 1 2
Figure 11-2 Touch-tone control.
C7 C8 R9 R10 V 20/200 Gain C6 J1 P1 U1 J2 P2 C1 R1 R2 XTL
1 In 2 In 3 CS 4 VREF 5 VSS 6 OSC1 7 OSC2 8 Tone 9 R/W 10 CS
V C5
C9 Radio Transceiver DB-9 female
7 6 5 4 3 2
14 8
C10 R11
2 6 7
Mic Phones
Tune
9 12Vdc O U3 I C3
20 19 18
C3 C4 R4
1 2 3 4 TX RX ATN 23 22 21 20 P15 19 P14 18 P13 17 P12 16 P11 15 P10 14 P9 13 P8
StGt Est
CM8880
17 D3 16 D2 15 D1 14
CP F2 RS0
13 12 11
R5 R6
1 2 3
RLY1 C2 D1 Q1 R7
GND 5 P0 6 P1 7 P2 8 P3 9 P4 10 P5 11 P6 12 P7
Figure 11-3 Touch-tone speaker.
PROGRAMMING 157
your arrival remotely, thus silencing the radio most of the time to eliminate other conversations. This is great, since most family members are not particularly interested in a lot of conversational noise. The Radio DTMF controller can be used for many different applications; we illustrated only two but your imagination can think up many more. You can expand the program to decode other tone sequences and more control relays if desired. The BASIC STAMP 2 program can be modified to suit your particular future needs. 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 FRS or the long range GMRS radios if desired.
Programming
With your remote radio decoder built and ready to go, you will next need to connect your remote radio tone decoder to your personal computer in order to program the system. Once the programming link cable has been connected and power applied to the circuit, you are ready to roll. Go to the STAMP 2 Windows Editor STAMPW.EXE, download the DECODE2.BS2 (Listing 11-1) program, and then run it. Remember that the remote radio DTMF controller program uses the sequence *1234567# as the code for the lock portion of the program. Note the code is placed in the lock lookup string, 1 to 9 digits in length, which has 16 corresponding string positions: D, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, #, A, B, C. The value at each position of the string is the key sequence of that digit. A string value of 0 forces a reset (wrong digit) and is used to turn off the relaylatched output device. A zero is used for all remaining digits not used in the combination code. With incorrect code attempts, one needs to input an additional reset DTMF tone ahead of the code string (any unused digit) for proper reset before use. When the proper sequence is received, a relay routine is activated as an output device. Pressing the digits #9 will reset the decoder when a wrong digit is pressed and you wish to begin again. The remote DTMF radio decoder project is fun to build and will lend itself to many different applications around your home or ham shack!
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