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.

 

Features

Analog clock mode

Digital clock mode

Infrared clock setting with a standard universal remote

control

 

Pictures

Click to enlarge

Anoalog mode Digital mode Stopped with flash at 1/60 sec

 

Sources codes & Shematics

-Shematic in PDF format

 

//**************************************// Clock 16Mhz// Version 1.0 Janvier 2002// Sylvain Bissonnette//**************************************

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

//INT 0MCUCR = 0x02; // Int0 generate int on falling eadgeGIMSK = 0x40; // Int0 enable

//Timer0TCCR0 = 0x05; // Timer0 / 1024

//Timer1TCCR1B = 0x42; // Timer1 / 8 & Input Capture on Rising eadgeTIMSK = 0x4a; // int enable on Timer1 Compare Match // int enable on Timer 1 Input Capture // int enable on Timer0 OverflowPORTB = 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}