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IRQ/CP
In In GS
Dial tone filter
High group filter
OSC1 OSC2
Oscillator circuit
Low group filter
Digital algorithm and code converter
Control register A 02 CS Control register B I/O control R/W RS0
Bias circuit
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Steering logic Est StGt
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VDO VREF VSS
Figure 11-1 CM-8880 touch-tone encoder/decoder.
152 RADIO DTMF TONE DECODER/CONTROL
In the beginning of the program listing you will notice the setup of the registers; also refer to Tables 11-4 and 11-5. The radio DTMF tone control circuit is shown in Fig. 11-2. The circuit begins with the input/output section of the CM8880 encoder/decoder chip. The audio input signal enters the CM8880 decoder section via pins 2 and 3, while the audio output section of the encoder enters the chip on pin 8. Note, the tone output on pin 8 is shown connected to the microphone input jack of the radio transceiver; this feature was not implemented in this project, but could be easily set up. Operationally you would use the STAMP 2 frequency output, or Freqout command, to send DTMF tones through your receiver The color burst crystal (XTL) at pins 6 and 7 sets up the reference oscillator section of the tone decoder chip. The decoded binary digital outputs from the CM8880 are presented on pins 14 through 17, i.e., D0 to D3, respectively. The R/W control bit is at pin 9, while the CS bit is on pin 10. The RS0 bit is input at pin 11. Data outputs of the CM8880 are connected to the STAMP 2 on pins 5 through 8. Setup or control data bits are presented to the BS2 controller on pins 9 through 11. The control relay at RLY1 is activated from STAMP 2 pin P7, which drives an npn transistor at Q1. The relay used was a low-current DPDT relay. Power is applied to the DTMF chip on pin 20 and ground is connected to pin 5. Reset pin 22 is coupled through a normally open pushbutton switch to ground in the event of a system lockup problem. Power to the BASIC STAMP 2 is applied to the 5-V pin of the STAMP 2 at pin 21, and is fed from the 5-V regulator at U3. System ground is applied to pin 23 of the BS2. You will need to locate or build a 9- to 12-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. Programming the STAMP 2 controller is achieved using the TX, RX, ATN, and ground pins 1 though 4. These pins are brought out through a header at P1, a 4-pin male 0.010-in header strip. A cable is then made between a female header at J1 and a 9-pin DB-9 female connector. The touch-tone radio decoder 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. When constructing the circuit board, be sure to observe the correct polarity while installing the capacitors and diodes, in order to avoid problems upon power-up. It is advisable to install IC sockets for the integrated circuits, in the event of a faulty component at a later date. Remember to install header strips for the programming cable as well as for the audio input and audio output connections. Once the circuit board has been built and checked, you can begin to look for a suitable plastic or aluminum chassis box.
DPDT Relay
The radio DTMF controller circuit can be used in many ways, but we are going to describe two possible applications. The first application, shown in Fig. 11-2, features a DPDT relay that can be utilized to activate a garage door opener, an electric dead-bolt strike or lock, or an air conditioner, fan, or some other home appliance. A second set of relay contacts can be wired in parallel to the first set of contacts for high-power-device control. The second set of contacts could also be used to control a second or simultaneous appliance.
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