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226 AVR PROJECT 2: A MORSE KEYER
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S1-S3: Switches S1: Playdot/Decrement S2: Playdash/Increment S3: Mode
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FIGURE 11.1 Block diagram of the Morse Keyer.
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components to build, besides the AVR processor. I decided to use the AT90S1200 processor, the simplest processor from the AVR family, as this project did not need any more features than provided by the AT90S1200. Figure 11.2 illustrates the circuit diagram of the Morse Keyer. A small piezo buzzer was used to provide the audio tone. The was operated at a clock frequency of 4 MHz using an external crystal. To reduce the component count further, one could use the internal RC oscillator of the 1200 processor. To use an ordinary 1200 processor in the internal RC oscillator mode, you need to enable the on-chip oscillator by clearing the RCEN control bit to 0. This chip is shipped with this bit set to 1 and can be cleared to 0 using the parallel programming mode only. However, if you have the AT90S1200A part number, it is shipped with the RCEN bit cleared to 0 and ready to use the internal RC oscillator as the processor clock source. The design has three push-button switches labeled mode, playdot/decrement and playdash/increment. Two of these switches are dual purpose. They are used to decrement and increment Morse code generation speed in one mode and as dot and dash tone generator in the other mode. When the Mode switch is pressed, the other two switches are used to adjust the speed. When the Mode switch is released, these switches function in their other
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FIGURE 11.2 Circuit schematic for the Morse Keyer.
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228 AVR PROJECT 2: A MORSE KEYER
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mode for generating the dots and dashes. The LED indicates the mode of operation of the circuit. When the Mode switch is pressed, the LED is ON, indicating that the other two switches are in the speed increment/decrement mode. To generate dots, the playdot/decrement switch is pressed (i.e., the logic at this switch is 0 ). This generates an audio tone of a duration of a dot. If this switch is kept pressed, the dots repeat with an intervening period of no tone equal to the dot period. Similarly, if the playdash/increment switch is pressed, an audio tone for the period of a dash is generated, and when keeping this switch pressed, continuous dashes are generated, with intervening periods of no tone equal to a dot period. By manipulating the two switches, tone sequence for any switch can be produced. The main heart of the software consists of Timer0 interrupt, which is used to generate the audio tone by toggling the PB7 pin. A piezo buzzer is connected to this pin. The Timer0 is programmed to generate an interrupt every 1.12 ms (i.e., an interrupt frequency of 892 Hz). Since the Timer0 ISR toggles the PB7 bit, the resulting audio tone has a frequency of 446 Hz. The speed of generation of the Morse code is implemented by counting the number of audio tone pulses generated. A software counter is used to monitor the number of pulses generated. If the number of pulses generated for a dot (or a dash) equals this count, then the generation is disabled for a period equal to a Dot time. The speed can be adjusted between 5 words per minute to more than 40 words per minute.
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Possible Alternatives
Since the total I/O requirement as illustrated in Figure 11.2 is just five I/O lines, it is possible to use the AT90S2343 or the Tiny22 processor. Either of these processors could be used for this project by operating the processor in the internal RC oscillator clock mode.
11.6 Fabrication
This circuit was tested on the Atmel AVR evaluation kit and no separate PCB was used.
11.7 Design Code
The design for the project is available in the code directory in the file morse1.asm. The design code is split up in small subroutines as follows:
1. Initialization: This section of the program is executed when the power is first applied
to the processor or the reset switch is pressed. In this section, the code initializes the various registers, the timer, port pins, etc. 2. Loop Here: This is the main part of the code. In this part, the processor checks if a key has been pressed and whether the Mode key is also pressed. Depending upon which key combination has been pressed, appropriate action is taken. The possible combinations are to execute a subroutine to increase the Morse code generation speed, decrease
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