INTRODUCTION
text information as a series of Morse code is a method of transmitting text information on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment. It is named for Samuel F. . !ors !orse e, an inve invent ntor or of the the tele telegr grap aph. h. "he Inte Intern rnat atio iona nall !ors !orse e #ode$%& encodes the IS' basic (atin alphabet, alphabet, some extra (atin letters, the )rabic the )rabic numerals and and a smal smalll set set of punc punctu tuat atio ion n and and proc proced edura urall signals *prosigns *prosigns++ as standardied sequences of short and long signals call called ed dot dots s and and das dashe hes s,,$%& or dits and dahs, s, as in amateur radio practice. radio practice. ecause many non-nglish natural languages use more than the /0 1oman letters, extensions to the !orse alphabet exist for those languages. ach !orse code symbol represents either a text character *letter or numeral+ or a prosign and is represented by a unique sequence of dots and dashes. "he duration of a dash is three times the duration of a dot. ach dot or dash is followed by a short silence, equal to the dot duration. "he letters of a word are separated by a space equal to three dots *one dash+, and the words are separated by a space equal to seven dots. "he dot duration is the basic unit of time measurement in code transmission. $%& "o increase the speed of the communication, the code was designed so that that the the leng length th of each each char charac acte terr in !orse !orse vari varies es appr approx oxim imate ately ly inver inverse sely ly to its its freq freque uency ncy of occu occurre rrenc nce e in ngl nglis ish. h. "hus "hus the the most most common letter in nglish, the letter , has the shortest code, a single dot. !orse code is used by some amat amateu eurr radi radio o oper operato ators rs,, altho althoug ugh h knowledge knowledge of and proficiency proficiency with it is no longer required required for licensing in licensing in most most countri countries. es. 2ilots and 2ilots and air air traffi traffic c control controlle lers rs usua usuall lly y need need only only a curs curso ory und underst erstan andi ding ng.. )eron eronau auti tica call navi naviga gati tion onal al aids aids,, such as 3'1s and 3'1s and 45s, 45s, cons consta tantl ntly y iden identi tify fy in !orse !orse code code.. #omp #ompar ared ed to voice, !orse code is less sensitive to poor signal conditions, yet still comp compre rehe hens nsib ible le to huma humans ns with withou outt a deco decodi ding ng devi device ce.. !orse orse is ther theref efor ore e a usef useful ul alte altern rnat ativ ive e to sy synt nthe hesi sie ed d spee speech ch for for send sendin ing g
automated data to skilled listeners on voice channels. !any amateur radio repeaters, for example, identify with !orse, even though they are used for voice communications. In an emergency, !orse code can be sent by improvised methods that can be easily keyed on and off, making it one of the simplest and most versatile methods of telecommunication. "he most common distress signal is S'S or three dots, three dashes and three dots, internationally.
The microcontroller used is MSP430g2553 whose pin diagram is shown below.
Description "he "exas Instruments !S2678 family of ultra-low-power microcontrollers consists of several devices featuring different sets of peripherals targeted for various applications. "he architecture, combined with five low-power modes, is optimied to achieve extended battery life in portable measurement applications. "he device features a powerful %0-bit 1IS# #29, %0-bit registers, and constant generators that contribute to maximum code efficiency. "he digitally controlled oscillator *5#'+ allows wake-up from low-power modes to active mode in less than % :s. "he !S2678;/x%7 and !S2678;/x<7 series are ultra-low-power mixed signal microcontrollers with built-in %0-bit timers, up to /6 I='
capacitive-touch enabled pins, a versatile analog comparator, and builtin communication capability using the universal serial communication interface. In addition the !S2678;/x<7 family members have a %8-bit analog-to-digital *)=5+ converter. For configuration details see . "ypical applications include low-cost sensor systems that capture analog signals, convert them to digital values, and then process the data for display or for transmission to a host system.
Features •
(ow Supply-3oltage 1ange> %.? 3 to 7.0 3
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9ltra-(ow 2ower #onsumption o
)ctive !ode> /78 :) at % !@, /./ 3
o
Standby !ode> 8.< :)
o
'ff !ode *1)! 1etention+> 8.% :)
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Five 2ower-Saving !odes
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9ltra-Fast Aake-9p From Standby !ode in (ess "han % :s
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%0-it 1IS# )rchitecture, 0/.<-ns Instruction #ycle "ime
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asic #lock !odule #onfigurations o
Internal Frequencies up to %0 !@ Aith Four #alibrated Frequency
o
Internal 3ery-(ow-2ower (ow-Frequency *(F+ 'scillator
o
7/-k@ #rystal
o
xternal 5igital #lock Source
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"wo %0-it "imerB) Aith "hree #apture=#ompare 1egisters
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9p to /6 #apacitive-"ouch nabled I=' 2ins
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9niversal Serial #ommunication Interface *9S#I+
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•
o
nhanced 9)1" Supporting )uto audrate 5etection *(I4+
o
Ir5) ncoder and 5ecoder
o
Synchronous S2I
o
I/#C
'n-#hip #omparator for )nalog Signal #ompare Function or Slope )nalog-to-5igital *)=5+ #onversion %8-it /88-ksps )nalog-to-5igital *)=5+ #onverter Aith Internal 1eference, Sample-and@old, and )utoscan
rownout 5etector
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•
Serial 'nboard 2rogramming, 4o xternal 2rogramming 3oltage 4eeded, 2rogrammable #ode 2rotection by Security Fuse
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'n-#hip mulation (ogic Aith Spy-i-Aire Interface
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2ackage 'ptions o
"SS'2> /8 2in, /? 2in
o
25I2> /8 2in
o
DF4> 7/ 2in
The schematic and board layout has been prepared in Eagle cad. Schematic is shown below:-
Board layout :-
Components used are:1)PCB abrication !it ") msp#$%g"&&$ $)resistors #)push butons &)switches ')capacitors ()buer *)+E,s )nuts and bolts The microcontroller chip has been coded in embedded c using Code Composer Studio de./hole circuit is powered using mini 0SB.
GURU GOBIND SINGH INDRAPRASTHA UNIVERSITY
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