NeoPixel Ring Clock - real time

Zápisník experimentátora

Translations: SK EN

Hierarchy: WS2812

In the last article of the series on creating clock from NeoPixel Ring we connect the real-time clock circuit. We will use IC DS1307, which contains in itself real-time clock. We will need only a few external components.

Scheme

Against the previous scheme we added I2C real-time clock. I2C uses two specific pins and two pull-up resistors. For details about using DS1307, see separate article.

Real time

We need real time during the start of the program. According to it, we set the starting position for the hour, minute and second hands.

#include <Time.h>
#include <DS1307RTC.h>

///
/// Program configuration
///
struct Configuration
{
ClockState cs;
bool show_millis;
int hour;
int minute;
int second;

Configuration()
: show_millis(SHOWMILLIS), cs(csClock), hour(STARTHOUR), minute(STARTMINUTE), second(0) {}
};
Configuration cfg;

///
/// Update all positions
///
void NeoClock::Update()
{
// we use fake time
uint32_t m=millis()+1000L*cfg.second+60000L*cfg.minute+3600000L*cfg.hour;

second = map ((m % 60000), 0, 60000, 0, CNT);
milli  = map ((m %  1000), 0,  1000, 0, CNT);
minute = map (((m/60000) % 60), 0,  60, 0, CNT);
hour =   map (((m/60000/60) % 12), 0,  12, 0, CNT);
}

///
/// Setup
///
void setup()
{
Serial.begin(9600);
while (!Serial) ; // wait for serial
Serial.println("NeoPixel Clock v. 1.4");
Serial.println("-------------------");
tmElements_t tm;
if (RTC.read(tm)) {
  Serial.print("Time = ");
  print2digits(tm.Hour);
  Serial.write(':');
  print2digits(tm.Minute);
  Serial.write(':');
  print2digits(tm.Second);
  Serial.print(", Date (D/M/Y) = ");
  Serial.print(tm.Day);
  Serial.write('/');
  Serial.print(tm.Month);
  Serial.write('/');
  Serial.print(tmYearToCalendar(tm.Year));
  Serial.println();
  
  cfg.second=tm.Second;
  cfg.minute=tm.Minute;
  cfg.hour=tm.Hour;
  }
  
strip.begin();
strip.show(); // Initialize all pixels to 'off'
strip.setBrightness(0); // disable flickering
}

Conclusion

In this series of articles we went through several successive points and we designed a clock with all the basic functions. We still have room for improvement, but it is a motivation for you to do it. You can improve source code.


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10.09.2015

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