Hello,
I'm trying to display the time on a custom LED watch face using an ISR interrupt function so that the LEDs are turned on/off so fast that there is image persistence. I can get the watch to display the hour well enough but as soon as I try to add in the minute or day of the week, it all falls apart and the display goes wacky.
It uses an ATmega328P-MMHR (28-pin VQFN) with an M41T62 (8 pin LCC) real time clock, powered by a CR2016 coin battery, and displays the time and day of the week on 33 multiplexed LEDs, ideally whenever a button is pressed.
Can anyone tell me where I'm going wrong and what I need to change to get things working properly?
Thanks,
Dylan.
The watch:
How time is displayed:
The schematic:
I program the ATmega via six ICSP pins attached to an Arduino Uno using 'Arduino as ISP' programmer:
Full code:
#define TIMER_INTERRUPT_DEBUG 2
#define _TIMERINTERRUPT_LOGLEVEL_ 0
#define USE_TIMER_1 true
#include "Wire.h" /// I2C library
#include "M41T62.h" /// RTC library for M41T62 (on-board watch) - NB: Use "dayOfWeek"
#include <TimerInterrupt.h>
RTC_M41T62 RTC; /// on-board M41T62 RTC
#define TIMER_FREQ_HZ 4000.0
#define NUM_COL 6 /// Columns are anodes
#define NUM_ROW 6 /// Rows are cathodes
#define COL_ON LOW /// badge code has these four inverted
#define COL_OFF HIGH
#define ROW_ON HIGH
#define ROW_OFF LOW
const int colLED[NUM_COL] = {2, 3, 4, 5, 6, 7}; /// pins for anode (+) connections on ATmega328, columns in LED matrix
const int rowLED[NUM_ROW] = {0, 1, A0, A1, A2, A3}; /// pins for cathode (-) connections on ATmega328, rows in LED matrix
const int hourRows = 6;
const int hourCols = 2;
int rowPin = 6;
int colPin = 6;
int hourRow;
int hourColumn;
int minuteRow;
int minuteColumn;
int hourArray[hourRows][hourCols] = {{1, 2}, {3, 4}, {5, 6}, {7, 8}, {9, 10}, {11, 12}};
/// - - - - - - - - - - - SETUP + LOOP - - - - - - - - - - - - - - - -
/// No access to serial monitor
void setup() {
Wire.begin(); /// I2C communication with the RTC
RTC.begin(); /// start RTC
RTC.adjust(DateTime(__DATE__, __TIME__)); /// set RTC time to computer time
for (int i = 0; i < NUM_COL; i++) /// set all column pins to OUTPUT and OFF
{
pinMode(colLED[i], OUTPUT); /// output
digitalWrite(colLED[i], COL_OFF); /// turn off
}
for (int j = 0; j < NUM_ROW; j++) /// set all row pins to OUTPUT and OFF
{
pinMode(rowLED[j], OUTPUT); /// output
digitalWrite(rowLED[j], ROW_OFF); /// turn off
}
ITimer1.init(); /// initialise timer 1
ITimer1.attachInterrupt(TIMER_FREQ_HZ, TimerHandler);
}
void loop() {
allOff();
getTime();
}
void TimerHandler() {
static bool toggle = false;
displayTime();
toggle = !toggle;
}
/// - - - - - - - - - - - display functions - - - - - - - - - - - - - - - -
void allOff() /// turns off all LEDs
{
/// all cathode pins to 0V
for (int i = 0; i < rowPin; i++) /// rowPin
{
digitalWrite(rowLED[i], LOW);
}
/// all anode pins to +5V
for (int j = 0; j < 1; j++) /// colPin
{
digitalWrite(colLED[j], HIGH);
}
}
void ledOn(int row, int col) /// turns on specfic LEDs
{
//allOff();
digitalWrite(rowLED[row], HIGH); /// cathode pin to +5V
digitalWrite(colLED[col], LOW); /// anode pin to 0V
}
/// - - - - - - - - - - - - - - - time functions - - - - - - - - - - - - - - - -
void getTime()
{
DateTime now = RTC.now();
int hour = now.hour();
int minute = now.minute();
int minuteRemainder = (now.minute() % 10) - 6;
int weekday = now.dayOfWeek() - 1;
/// set hour
if (hour > 12) {
hour -= 12;
};
for (int i = 0; i < hourRows; i++) {
for (int j = 0; j < hourCols; j++) {
if (hour == hourArray[i][j]) {
(hourRow = i);
(hourColumn = j);
}
}
}
/// Set minute
if (minute % 10 == 5) {
/// The minute ends in 5
minuteColumn = 2;
minuteRow = (minute - 6) / 10;
} else if (minute % 10 == 0) {
/// The minute ends in 0
minuteColumn = 3;
if (minute == 0) {
minuteRow = 5;
} else {
minuteRow = (minute / 10) - 1;
}
}
}
void displayTime()
{
ledOn(hourRow, hourColumn);
//ledOn(minuteRow, minuteColumn);
//turnOnRemainderLeds(minuteRemainder);
//ledOn(wkDay, 5);
}
