I have this working code below that i currently use on one of my aquariums to ramp on, hold and ramp off the lights with a 0 - 5v signal. Everything works great.
Now I am building a new set of lights and the drivers work opposite of my current drivers. I need 5v to turn them off and 0v for them to run at 100%. I tried changing my timing parameters so that they come on when the Arduino turns them off and visa versa. Issue is when the code turns them off (the lights are on) I loose my ability to adjust the brightness, cause the controller is at 0, thus the lights are at 100% and adjusting my ledMax does nothing (of course, cause they are off).
I'm sure I could do it with circuitry, but since it's already wired up code would be much easier.
/*
Arduino LED controller for reef aquariums
paramterized LED lighting control for reef aquariums
use a DS1307 RTC to kick off lighting schedules
fade up on a given slope
delay a set amount
fade back down
such that the photoperiod lasts the correct amount of time
// Circuit
// PWM pins described below connected to dimming circuits on drivers
// ledMaster pin below connected to a 120V AC relay to turn the LED drivers on and off (optional)
// grounds from drivers connected to arduino ground
// DS1307 RTC connected via I2C
*/
// Pins to control LEDs. Change these if you're using different pins.
int togSwitch = 10; // RTC Overide Switch
int blueLed = 3; // LED PWM channel for blues
int whiteLed = 9; // LED PWM channel for whites
int uvLed = 11; // select the pin for the LED
int moonLed = 6; // select the pin for the LED
int whitePot = A0; // select the input pin for the potentiometer
int bluePot = A1; // select the input pin for the potentiometer
int uvPot = A2; // select the input pin for the potentiometer
int moonPot = A3; // select the input pin for the potentiometer
// Set up RTC
#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68
// RTC variables
byte second, rtcMins, oldMins, rtcHrs, oldHrs, dayOfWeek, dayOfMonth, month, year, psecond;
// Other variables. These control the behavior of lighting. Change these to customize behavoir
int minCounter = 0; // counter that resets at midnight. Don't change this.
int blueStartMins = 420; // minute to start blues. Change this to the number of minutes past
// midnight you want the blues to start.
int whiteStartMins = 420; // minute to start whites. Same as above.
int uvStartMins = 420; // minute to start ultra violet. Same as above.
int moonStartMins = 1200; // minute to start moon lights. Same as above.
int bluePhotoPeriod = 720; // photoperiod in minutes, blues. Change this to alter the total
// photoperiod for blues.
int whitePhotoPeriod = 720; // photoperiod in minutes, whites. Same as above.
int uvPhotoPeriod = 720; // photoperiod in minutes, ultra violets. Same as above.
int moonPhotoPeriod = 420; // photoperiod in minutes, moon lights. Same as above.
int fadeDuration = 120; // duration of the fade on and off for sunrise and sunset. Change
// this to alter how long the fade lasts.
int togState = 0; // variable for reading the toggle switch status
/****** LED Functions ******/
/***************************/
//function to set LED brightness according to time of day
//function has three phases - ramp up, hold, and ramp down
void setLed(int mins, // current time in minutes
int ledPin, // pin for this channel of LEDs
int start, // start time for this channel of LEDs
int period, // photoperiod for this channel of LEDs
int fade, // fade duration for this channel of LEDs
int ledMax // max value for this channel
) {
if (mins <= start || mins <= mins > start + period) {
analogWrite(ledPin, 0);
}
if (mins > start && mins <= start + fade) {
analogWrite(ledPin, map(mins - start, 0, fade, 0, ledMax));
}
if (mins > start + fade && mins <= start + period - fade) {
analogWrite(ledPin, ledMax);
}
if (mins > start + period - fade && mins <= start + period) {
analogWrite(ledPin, map(mins - start - period + fade, 0, fade, ledMax, 0));
}
}
/***** RTC Functions *******/
/***************************/
// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
return ( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
return ( (val/16*10) + (val%16) );
}
// 1) Sets the date and time on the ds1307
// 2) Starts the clock
// 3) Sets hour mode to 24 hour clock
// Assumes you're passing in valid numbers.
void setDateDs1307(byte second, // 0-59
byte minute, // 0-59
byte hour, // 1-23
byte dayOfWeek, // 1-7
byte dayOfMonth, // 1-28/29/30/31
byte month, // 1-12
byte year) // 0-99
{
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.write(0);
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(decToBcd(dayOfWeek));
Wire.write(decToBcd(dayOfMonth));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.endTransmission();
}
// Gets the date and time from the ds1307
void getDateDs1307(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.write(0);
Wire.endTransmission();
Wire.requestFrom(DS1307_I2C_ADDRESS, 7);
*second = bcdToDec(Wire.read() & 0x7f);
*minute = bcdToDec(Wire.read());
*hour = bcdToDec(Wire.read() & 0x3f);
*dayOfWeek = bcdToDec(Wire.read());
*dayOfMonth = bcdToDec(Wire.read());
*month = bcdToDec(Wire.read());
*year = bcdToDec(Wire.read());
}
void setup() {
pinMode(togSwitch, INPUT);
Wire.begin();
// Serial.begin(9600);
}
/***** Main Loop ***********/
/***************************/
void loop() {
// get time from RTC and put in hrs and mins variables
getDateDs1307(&second, &rtcMins, &rtcHrs, &dayOfWeek, &dayOfMonth, &month, &year);
minCounter = rtcHrs * 60 + rtcMins;
// Serial.println(second);
// Serial.print("MinCount");
// Serial.println(minCounter);
int sensorValueb = analogRead (bluePot);
int blueMax = map (sensorValueb, 0, 1023, 0, 255);
int sensorValuew = analogRead (whitePot);
int whiteMax = map (sensorValuew, 0, 1023, 0, 255);
int sensorValueu = analogRead (uvPot);
int uvMax = map (sensorValueu, 0, 1023, 0, 255);
int sensorValuem = analogRead (moonPot);
int moonMax = map (sensorValuem, 0, 1023, 0, 255);
int togState = digitalRead(togSwitch);
if (psecond != second){
psecond = second;}
if(togState == HIGH)
{
analogWrite(whiteLed, whiteMax);
analogWrite(blueLed, blueMax);
analogWrite(uvLed, uvMax);
analogWrite(moonLed, moonMax);
}
else
{
setLed(minCounter, whiteLed, whiteStartMins, whitePhotoPeriod, fadeDuration, whiteMax);
setLed(minCounter, blueLed, blueStartMins, bluePhotoPeriod, fadeDuration, blueMax);
setLed(minCounter, uvLed, uvStartMins, uvPhotoPeriod, fadeDuration, uvMax);
setLed(minCounter, moonLed, moonStartMins, moonPhotoPeriod, fadeDuration, moonMax);
}
delay(50);
}
Thanks in advance and if anybody is looking for a simple dawn to dusk LED controller with a separate moon light channel this works great.