Propeller clock Analog and digital.

Propeller Analog/Digital Clock

History

I got this idea by browsing the web. I found by hazard  Mr. Bob Blick's page who make the first propeller clock.  I began to check how can I build one myself.  Base on AVR AT90S2313 I saw rapidly that my MCU must be clocked very fast to make all the calculations needed to light the leds at the right place.  The speed is at 16Mhz,  4 times faster than Atmel's specifications. It's working without any problems.

Each time the PCB passed at 12h00 an hall effect sensor sensed the magnet and generated an interruption. At this time, we have to check the counter to se how many ticks had been passed from this rotation since  the last rotation tooks this value and divide it by 360. This calculation will gives you the time between each degree.  Now, you have to set an interruption to occur at each degree and after you will be able to light leds whenever you want at any of 360 degrees.  At this MCU speed, there is no jitter everything is just FIXED!!!

A simple IR sensor is used to take the signal from the remote control (set to a Sony protocol).

Don't forget to use HIGH BRIGHTNESS LEDS 1600mcd.  Leds are not lighted very long so the mcd's power must be high.

A testing video can be found here.

Features

	Analog clock mode
	Digital clock mode
	Infrared clock setting with a standard universal remote control

Sources codes & Shematics

//**************************************

// Clock 16Mhz

//**************************************

//**************************************

//            I N C L U D E

//**************************************

#include <io2313v.h>

#include <macros.h>

//**************************************

//            D E F I N E

//**************************************

#define TRUE      0x01

#define FALSE     0x00

#define ANALOG    0x01

#define DIGITAL   0x02

//**************************************

//  I N T E R R U P T   H A N D L E R

//**************************************

#pragma interrupt_handler Crossing_interrupt:2

#pragma interrupt_handler IR_interrupt:4

#pragma interrupt_handler Degre_interrupt:5

#pragma interrupt_handler Ticker_interrupt:7

//**************************************

//          P R O T O T Y P E

//**************************************

void Crossing_interrupt(void);

void Degre_interrupt(void);

void Time(unsigned char);

void IR_interrupt(void);

void Ticker_interrupt(void);

void Display(void);

void CopyData(int Value);

void CopyDot(void);

//**************************************

//   G L O B A L   V A R I A B L E

//**************************************

int WeelPosition;

unsigned char Pos;

unsigned int Adder;

unsigned char LatchedIrData;

unsigned char Sec;

unsigned char Min;

unsigned char Hrs;

int SecComp;

int MinComp;

int HrsComp;

unsigned char ClockStyle;

unsigned char TimeString[50];

unsigned char *TimeStringPtr;

unsigned char i;

//**************************************

//           C O N S T A N T

//**************************************

const unsigned char table[12][6] = {{ 0x3e, 0x41, 0x41, 0x41, 0x3e, 0x00 }, // 0

                                    { 0x00, 0x21, 0x7f, 0x01, 0x00, 0x00  }, // 1

                                    { 0x21, 0x43, 0x45, 0x49, 0x31, 0x00  }, // 2

                                   { 0x42, 0x41, 0x51, 0x69, 0x46, 0x00  }, // 3

                                    { 0x0c, 0x14, 0x24, 0x5f, 0x04, 0x00  }, // 4

                                    { 0x72, 0x51, 0x51, 0x51, 0x4e, 0x00  }, // 5

                                    { 0x1e, 0x29, 0x49, 0x49, 0x06, 0x00  }, // 6

                                    { 0x40, 0x47, 0x48, 0x50, 0x60, 0x00  }, // 7

                                    { 0x36, 0x49, 0x49, 0x49, 0x36, 0x00  }, // 8

                                    { 0x30, 0x49, 0x49, 0x4a, 0x3c, 0x00  }, // 9

                                    { 0x00, 0x36, 0x36, 0x00, 0x00, 0x00  }, // :

                                    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00  }};// space

//**************************************

//            M A I N

//**************************************

void main()

{

WDTCR = 0x0e;        // Enable WatchDog at 0.97 sec

PORTD = 0x0d;        // Pull up on PD2&PD3 & Led White ON

DDRD = 0x03;         // PD0-O PD1-O PD2-I PD3-I PD4-I PD5-I PD6-I PD7-I

//INT 0

MCUCR = 0x02;        // Int0 generate int on falling eadge

GIMSK = 0x40;        // Int0 enable

//Timer0

TCCR0 = 0x05;        // Timer0 / 1024

//Timer1

TCCR1B = 0x42;       // Timer1 / 8 & Input Capture on Rising eadge

TIMSK = 0x4a;        // int enable on Timer1 Compare Match

                  // int enable on Timer 1 Input Capture

                  // int enable on Timer0 Overflow

PORTB = 0x00;

DDRB = 0xff;         // PB0-7 as output

Hrs = 0;

Min = 0;

Sec = 0;

ClockStyle = ANALOG;

SEI();

while(1)

   {

   asm("WDR");

   for (i=0;i<200;i++);

   if ((LatchedIrData == 0xbb) || (LatchedIrData == 0x92)) Time(TRUE);

   if ((LatchedIrData == 0xb3) || (LatchedIrData == 0xb0)) ClockStyle = DIGITAL;

   if ((LatchedIrData == 0xb4) || (LatchedIrData == 0xb1)) ClockStyle = ANALOG;

   LatchedIrData = 0;

   }

}

/**********************************************************

Name:       void Time(void)

Description:  

Input:         none

Output:        none

Misc:      

**********************************************************/

void Time(unsigned char Fast)

{

if (Fast == FALSE) Sec++;

else Sec += 60;

if (Sec > 59)

   {

   Sec = 0;

   Min++;

   if (Min > 59)

        {

     Min = 0;

     Hrs++;

     if (Hrs > 11)

       {

       Hrs = 0;

       }

     }

   }

if (ClockStyle == ANALOG)

   {

   SecComp = Sec*6;

   MinComp = Min*6;

   HrsComp = (Hrs*30)+(Min/2);

   }

else

   {

   TimeStringPtr = &TimeString[0];

   CopyData(Hrs);

   CopyDot();

   CopyData(Min);

   CopyDot();

   CopyData(Sec);

   }

}

/**********************************************************

Name:       void CopyData(int Value)

Description:  

Input:         none

Output:        none

Misc:      

**********************************************************/

void CopyData(int Value)

{

if (Value < 10)

   {

   for (i=0;i<6;i++) *TimeStringPtr++ = table[0][i];

   for (i=0;i<6;i++) *TimeStringPtr++ = table[Value][i];

   }

else

   {

   for (i=0;i<6;i++) *TimeStringPtr++ = table[Value/10][i];

   for (i=0;i<6;i++) *TimeStringPtr++ = table[Value-((Value/10)*10)][i];

   }

}

/**********************************************************

Name:       void CopySpace(void)

Description:  

Input:         none

Output:        none

Misc:      

**********************************************************/

void CopyDot(void)

{

for (i=0;i<6;i++) *TimeStringPtr++ = table[10][i];

}

/**********************************************************

Name:       void Crossing_interrupt(void

Description:  

Input:         none

Output:        none

Misc:      

**********************************************************/

void Crossing_interrupt(void)

{

static unsigned int LastCount;

static unsigned int TotalCount;

static int Latch;

static unsigned char Lap;

Latch = TCNT1;

TotalCount = Latch - LastCount;

LastCount = Latch;

Lap++;

if (Lap > 250)

   {

   Adder = TotalCount / 378;

   Lap = 0;

   }

WeelPosition = 0;

OCR1 = Latch + Adder;

TIFR |= 0x80;

Display();

}

/**********************************************************

Name:       void Degre_interrupt(void)

Description:  

Input:         none

Output:        none

Misc:      

**********************************************************/

void Degre_interrupt(void)

{

OCR1 = TCNT1 + Adder;

Display();

}

/**********************************************************

Name:       void Display(void)

Description:  

Input:         none

Output:        none

Misc:      

**********************************************************/

void Display(void)

{

PORTB = 0x00;

if (ClockStyle == ANALOG)

   {

   if (WeelPosition == HrsComp) PORTB = 0x80;

   if (WeelPosition == MinComp) PORTB = 0xff;

   if (WeelPosition == SecComp) PORTB |= 0x03;

   if ((WeelPosition == 0) ||

      (WeelPosition == 30) ||

     (WeelPosition == 60) ||

     (WeelPosition == 90) ||

     (WeelPosition == 120) ||

     (WeelPosition == 150) ||

     (WeelPosition == 180) ||

     (WeelPosition == 210) ||

     (WeelPosition == 240) ||

     (WeelPosition == 270) ||

     (WeelPosition == 300) ||

     (WeelPosition == 330)) PORTB |= 0x01;

   }

else

   {

   Pos = ((WeelPosition-100) / 3);

   if (Pos < 49)

        {

     PORTB = TimeString[48-Pos];

     }

   }

WeelPosition++;

}

/**********************************************************

Name:       void IR_interrupt(void)

Description:   This routine is called whenever a rising edge (beginning

                of valid IR signal) is received.

                - The data codes are sent using pulse coding.

                - Each packet has 12 bits and a header.

                - The basic time period T = 550us.

                - The header length = 4T (2.2ms)

                - 0 = pulse with length T followed by space of length T.

                - 1 = pulse with length 2T followed by space of length T.

                - The last 5 bits represent the Addess.

                - The first 7 bits represent the command.

                - A packet is transmitted every 25ms while a button is down.

Input:         none     

Output:        Global variable LatchedIrData

Misc:       Sony VCR protocol

**********************************************************/

void IR_interrupt(void)

{

static unsigned int LastCapture;

unsigned int PulseWidth;

static unsigned int IrPulseCount;

static unsigned int IrData;

PulseWidth = ICR1 - LastCapture;

LastCapture = ICR1;

if (PulseWidth > 4000)

   {

   IrPulseCount = 0;

   IrData = 0;

   }

else

   {

   IrData = IrData >> 1;

   if (PulseWidth > 2800) IrData = IrData | 0x8000;

   IrPulseCount++;

   if (IrPulseCount == 12) LatchedIrData = ((IrData >> 4) & 0x00ff);

   }

}

/**********************************************************

Name:       void Ticker_interrupt(void)

Description:  

Input:         none

Output:        none

Misc:      

**********************************************************/

void Ticker_interrupt(void)

{

static unsigned char Tick;

Tick++;

if (Tick > 62)

   {

   Time(FALSE);

   Tick = 0;

   }

TCNT0 = 0x04; // reload counter

}