Adjustable 7Segment Alarmclock

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Adjustable 7-Segment Alarmclock
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Presentation Index

• Goals of the project
• Project Phases
• Project analyses
• Hardware set-up
• Software set-up
• Project round off
• Conclusion/Evaluation
• Questions?

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Technical Goals of the project

• Create a working concept of the idea
• Combine high accuracy with low costs
• Finish the project in time

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Project Phases

• Project analyses
• Time display
• Display driver
• Power supply
• Programming

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• Hardware Set-up

• Output Circuit
• Input Circuit
• Programming Circuit
• Clock Circuit
• Display Circuit
• Power Supply

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• Software Set-up
• Display driver

void writeSeg(int i) void writeSeg(int i)
//.GFEDCBA //Inverted in de hardware
//11000000 '0' //11111001 '1' //10100100
'2' //10110000 '3' //10011001 '4'
//10010010 '5' //10000010 '6' //11111000
'7' //10000000 '8' //10010000 '9'
//01111111 '.' //10000111 't' //11001111
'I' //11100001 'J' //10100001 'd'
const unsigned char cijfers150xc0,0xF9,0xa4,0x
b0,0x99 output_d(cijfersi)
displ() void displ(void) static int16
currentSeg0 selectCol(0)
writeSeg(cijfercurrentSeg)
selectCol(currentSeg1) currentSeg
if (currentSeggt3) currentSeg0
void selectCol(int16 i) if(i0)
Output_high(SEGMENT_0) // Schoonmaken
van display Output_high(SEGMENT_1)
Output_high(SEGMENT_2)
Output_high(SEGMENT_3) if(i1)
Output_low(SEGMENT_0) //
aansturing digit 1
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• Time calculation

int_TIMER2 //Dit interrupt word elke 4ms
aangesproken Tijd() Timer if(Timer gt
15000) if(cijfer0 lt
9)cijfer0 else
cijfer00 cijfer1
Timer0
setup_timer_2 (T2_DIV_BY_4, 249,
10) Example setup_timer_2 (mode, period,
postscale) mode may be one of T2_DISABLED,
T2_DIV_BY_1, T2_DIV_BY_4, T2_DIV_BY_16   period
is a int 0-255 that determines when the clock
value is reset,   postscale is a number 1-16
timer resets before interrupt
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The project round off
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Conclusion/Evaluation

• How good is the accuracy of the clock?
• Did i achieve the main goals?
• Did i finisch the project in time?

Ber. (2sec x 365dagen)/60 12.16 minutes
(100/43200s)x43199s 99.997
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Questions?