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AVR PROJECT 2: A MORSE KEYER
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11.1 At a Glance
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Salient features of this chapter are:
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An interesting project for amateur radio enthusiasts. Uses an AT90S1200 and sundry components. Discusses alternative designs. Shows how to modify the circuit and code for an 8-pin AT90S2343 or ATtiny22.
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Introduction
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A large number of amateur radio enthusiasts all over the world employ Morse code for radio communications. Morse code is an international system of signals employed in radio telegraphy in the land-telegraph systems of all countries. For that they must first learn Morse code. Morse code is a signaling standard using audio tones. It relies on tone duration for encoding whatever symbols you want to encode. The code specifies two types of tone durations: a short duration and a long duration. The long duration is three times the duration of the short duration tone. The duration of the tone itself is variable, and the actual value determines the speed of transmission. Symbols that
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224 AVR PROJECT 2: A MORSE KEYER
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are encoded comprise a sequence of short and long tones. The various tones in a symbol are spaced with periods of silence (i.e., periods of no tone). These periods are of the same duration as the short-duration tone. Symbols separated by no tone period are equal to that of a long-duration tone. These symbols are called dots and dashes. If a dot is for a time T, then the dash is for a time 3T. A standard form of Morse code that is acceptable everywhere is called International Morse code. To learn Morse code, you need to listen to the tones for each symbol and remember them.
INTERNATIONAL MORSE CODE FOR THE ALPHABETS
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
.-... -.-. -.. . ..-. --. .... .. .---..-.. --. --.--. --..-. ... ......--..-.---..
Alfa Bravo Charlie Delta Echo Foxtrot Golf Hotel India Juliet Kilo Lima Mike November Oscar Papa Quebec Romeo Sierra Tango Uniform Victor Whiskey X-ray Yankee Zulu
DESIGN DESCRIPTION 225
INTERNATIONAL MORSE CODES FOR NUMBERS AND PUNCTUATION
1 2 3 4 5 6 7 8 9 0
.---..--...-......... -.... --... ---.. ----. -----
Full-stop (period) .-.-.Comma --..-Colon ---... ..--..
Question mark (query) Apostrophe Hyphen -....Fraction bar -..-. .----.
Brackets (parentheses)-.--.Quotation marks .-..-.
One of the common ways to learn Morse code is to buy recorded audio cassettes which play sounds of all the symbols. You hear this again and again till you memorize all the symbols. Then you want to be able to generate Morse code on your own before you start using it for radio transmission. In this chapter we will build a simple yet powerful Morse code generator. A very simple Morse code generator could be built using a simple buzzer in series with a Morse key. However, for radio transmission, that is not suitable. Also, these days it is more common to use a paddle rather than a Morse Key. A paddle is a mechanical device that has two sets of contacts. In one position, it generates dashes and in the other position, it generates dots. Our Morse code keyer is designed to work with a paddle type of Morse key.
11.3 Design Specification
For this circuit, we needed a simple circuit that could be connected to the popular More Paddle if available or even to ordinary push-button type switches for generating the Morse dots and dashes. It was also desired, as always, to keep the current consumption as small as possible to facilitate extended battery operation. It was also felt necessary to be able to control the Morse code generation speed, and above all, to keep the circuit small so as to be portable.
11.4 Design Description
To meet the above design objectives, we came up with a simple AVR AT90S1200-based Morse keyer circuit. Figure 11.1 illustrates the block diagram of the Morse Keyer. It is a very simple circuit and needs only a few switches, an LED, a buzzer, and few other sundry
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