Reef Tank lighting project

hi guys,

i've got marine fishkeeping , have started small reef tank small fish coral.
i went out looking lighting unit suit tank , ended getting 1 suitable larger tank @ right price - large led fitting £30!!

i've decided i'm going add dimmer functionality it, , i've decided might well  have timer controlled @ same time.
logical option arduino.

i've got arduino nano, rtc module, , 2 ldd-500h meanwell dimmable current-limited drivers.

i'm planning drive white leds using 1 ldd, , blue leds another.
i'm wanting use pwm on arduino, , commands based on real time clock adjust light intensity, can me started on code? i'm wanting start fading lights on gradually, peaking in middle of afternoon, , fading them out. haven't used rtc before appreciated!

thanks,
steve



p.s. arduino i'm using arduino nano, £3 china! there 1 £1.50 had buy module connect usb , programme £1.50 (although if have lot of projects save few £!

i started tank never finished. here have far. delays need replaced millis() or rtc.
the way written fade led full power in hour stay on 6 hours fade down off.

code: [select]


int ledone = 9;  // pin led attached to
int ledtwo = 10;
int ledthree = 11;
int brightness = 55;    // how bright led is
int fadeamount = 1;    // how many points fade led by

// setup routine runs once when press reset:
void setup()  {
 // declare pin 9 output:
 pinmode(ledone, output);
  pinmode(ledtwo, output);
   pinmode(ledthree, output);
}

// loop routine runs on , on again forever:
void loop()  {

 // set brightness of pin 9:
 analogwrite(ledone, brightness);
 analogwrite(ledtwo, brightness);
 analogwrite(ledthree, brightness);
 // change brightness next time through loop:
 brightness = brightness + fadeamount;

if (brightness == 255){
 delay(25200000);
}


 // reverse direction of fading @ ends of fade:
 if (brightness == 55 || brightness == 255) {
   fadeamount = -fadeamount ;
 }    
 // wait 30 milliseconds see dimming effect    
 delay(18000);                            
   }


-ruli00

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