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5.17 Wiring 3 4 telephone keypad
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5.18 DTMF encoder circuit using 4
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5089 is shown in Fig. 5.19. If you use a standard 3 4 (telephone) keypad, you will lose the four functional DTMF codes associated with the missing keys, therefore reducing the maximum number of usable channels to 12. Figure 5.20 is an encoder test circuit that uses an eight-position dip switch. The dip switch takes the place of the matrix keypad; with it you can test the operation of this encoder circuit and the receiver (decoder) circuit. Notice when you turn a switch on, you are grounding the pin it is connected to. Pins R1 through R4 and C1 through C4 are active low. Dip switches 1 through 4 are connected to pins R1 through R4, and dip switches 5 through 8 to pins C1 through C4.
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5.19 Pin out of 5089 DTMF encoder IC
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1 15 9 5 4
XTAL
7 8 6
3 14 13 12 11 16
TONE OUT 4.7K
XTAL = 3.57 MHz
5.20 Schematic of encoder circuit using eight-position dip switch five
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5.21 Pin out of G8870 DTMF decoder IC
The IC can also produce single tones. These are usually generated for testing purposes. For instance, to generate a 1336-hertz (Hz) tone equivalent to that of the C2 pin, ground any two row pins and the C2 pin. This action will generate a single 1336-Hz signal. The same may be done with the row frequencies. Ground any two column pins with the particular row frequency pin you want to generate. DTMF decoding DTMF decoding is just a little more complex than encoding. Again the simplicity results from the use of a single IC chip, in this case the G8870 (see Fig. 5.21). The decoding chip has a 4-bit latched output labeled Q1 through Q4. Q4 is the most significant bit (MSB). The current available from the outputs of Q1 through Q4 is sufficient to light a low-current LED. Figure 5.22 is a basic receiving circuit. The output from Q1 through Q4 lights the LED and is a binary number. By looking at Table 5.3, you can determine the binary output that will be displayed on the Q1 through Q4 for all DTMF signals. The way the circuit is wired, the binary 1 will be represented by a lit LED. Microcontroller The 4-bit number from the G8870 can be connected directly to input lines of a microcontroller like the PIC 16F84. The microcontroller can easily read this binary number. We will get to the PIC microcontrollers in Chap. 7.
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5.22 Schematic of receiver circuit with 4-bit binary output
I Table 5.3 DTMF Output
Signal frequency, Hz Decimal
1 2 3 4 5 6 7 8 9 0 * # A B C D
Binary
0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000
697 697 697 770 770 770 852 852 852 941 941 941 697 770 852 941
High
1209 1336 1477 1209 1336 1477 1209 1336 1477 1336 1209 1477 1633 1633 1633 1633
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5.23 Schematic of receiver circuit with digital display
The IR link discussed in the next few paragraphs combined with the PIC microcontroller outlined in Chap. 7 will allow users to program communications between mobile robots for games like tag and follow the leader. Adding a digital display If reading binary numbers is too cumbersome, we can add a digital numerical display. The output from the chip may also be fed to a binary-coded-decimal (BCD) to 7-segment decoder chip, such as the 7448. The 7448 IC is connected to a 7-segment display like the MAN 74 (common cathode). These two chips will provide a digital readout (see Fig. 5.23). Testing For testing purposes connect the output from the 5089 chip (pin 16) to the input of the G8870 chip, using either a keypad or dip switches to generate the DTMF signals. The receiver will display the output via the LEDs or segmented display. Adding IR transmission Once the DTMF chips are operating properly, it becomes a simple matter to connect the chips via an IR link. The output of the 5089 chip is connected to the base of a common NPN transistor (see Fig. 5.24). A high-power IR LED diode is connected to the emitter
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