Hi!
I just found a code to controll my LED with the Arduino. I changed and added things for my own needs. The editor wanted it to fade from 0 - 255 within two hours, stay at full brightness over the day and fade it down to zero at the evening. What I am not understandig is, where the hell is written down, that the fading process takes two hours? I wanted to test, if it works within, let's say 10 minutes. Don't want to wait all day long, just to see the dimming process 
Another thing is, that I don't really understand what this line does:
lcd.print("R: ");
if(((brightness(time, 8*HOUR+30*MINUTE, 21*HOUR+30*MINUTE))*100/255) < 10) {
lcd.print("0");
}
lcd.print((brightness(time, 8*HOUR+30*MINUTE, 21*HOUR+30*MINUTE))*100/255);
lcd.print("% ");
If time, 8HOUR+30MINUTE, 21HOUR+30MINUTE))*100/255 is smaller then 10 (which it is even if I take 24h!), LCD shall print Zero?
You may have an idea for me. My Code is the following:
#define Tmin 20
#define Tmax 55
#include <Wire.h>
#include <LiquidCrystal.h>
#include <PWM.h>
int32_t frequency = 25000;
#define DS1307_ADDRESS 0x68 // This is the I2C address
LiquidCrystal lcd(12, 11, 6, 5, 4, 3);
const int whitePin = 10;
const int bluePin = 2;
const int greenPin = 7;
const int redPin = 8;
const int uvPin = 1;
const unsigned long HOUR = 60 * 60;
const unsigned long MINUTE = 60;
const int TARGET_BRIGHTNESS = 255;
int i, temp1;
int fan = 9;
int a, value;
void setup()
{
pinMode(fan, OUTPUT);
pinMode(7, INPUT);
lcd.begin(20, 4);
Wire.begin();
}
byte bcdToDec(byte val) {
// Convert binary coded decimal to normal decimal numbers
return ( (val/16*10) + (val%16) );
}
void loop()
{
InitTimersSafe();
bool succes = SetPinFrequencySafe(9, frequency);
temp1 = ((5.0*analogRead(A3)*100.0)/1024);
fan = map(temp1, Tmin, Tmax, 0, 255); // Tmin->0% // Tmax->100%
if (fan<25) fan = 0;
if (fan>255) fan = 255;
analogWrite(9, fan); // PWM Geschwindigkeit setzen
lcd.setCursor(4,0);
///// Get time from RTC into RTCHour, RTCMinute, RTCSecond
// Set the register pointer to 0 (Second)
Wire.beginTransmission(DS1307_ADDRESS);
Wire.write((byte)0);
Wire.endTransmission();
// Read Second, Minute, and Hour
Wire.requestFrom(DS1307_ADDRESS, 3);
int RTCSecond = bcdToDec(Wire.read());
int RTCMinute = bcdToDec(Wire.read());
int RTCHour = bcdToDec(Wire.read() & 0b111111); //****************************************** 24h Zeit
//******************************************************************************************** Zeit auf LCD XX:XX:XX
if(RTCHour < 10) {
lcd.print("0");
}
lcd.print(RTCHour);
lcd.print(":");
if(RTCMinute < 10) {
lcd.print("0");
}
lcd.print(RTCMinute);
lcd.print(":");
if(RTCSecond < 10) {
lcd.print("0");
}
lcd.print(RTCSecond);
lcd.setCursor(13,0);
lcd.print("Uhr");
unsigned long time = RTCHour * HOUR + RTCMinute * MINUTE + RTCSecond; // Time in seconds
// write value within the timeframe to PWM
analogWrite(whitePin, brightness(time, 10*HOUR, 20*HOUR));
analogWrite(bluePin, brightness(time, 8*HOUR, 22*HOUR));
analogWrite(greenPin, brightness(time, 8*HOUR+30*MINUTE, 21*HOUR+30*MINUTE));
analogWrite(redPin, brightness(time, 8*HOUR+30*MINUTE, 21*HOUR+30*MINUTE));
analogWrite(uvPin, brightness(time, 8*HOUR, 22*HOUR));
//********************************************************************************************************************************Weiss
lcd.setCursor(0,1); //greenPin
lcd.print("W: ");
if(((brightness(time, 10*HOUR, 20*HOUR))*100/255) < 10) {
lcd.print("0");
}
lcd.print((brightness(time, 10*HOUR, 20*HOUR))*100/255);
lcd.print("% ");
//******************************************************************************************************************************** Blau
lcd.print("B: ");
if(((brightness(time, 8*HOUR, 22*HOUR))*100/255) < 10) {
lcd.print("0");
}
lcd.print((brightness(time, 8*HOUR, 22*HOUR))*100/255);
lcd.print("% ");
//******************************************************************************************************************************** Grün
lcd.setCursor(0,2);
lcd.print("G: ");
if(((brightness(time, 8*HOUR+30*MINUTE, 21*HOUR+30*MINUTE))*100/255) < 10) {
lcd.print("0");
}
lcd.print((brightness(time, 8*HOUR+30*MINUTE, 21*HOUR+30*MINUTE))*100/255);
lcd.print("% ");
//******************************************************************************************************************************** UV
lcd.print("R: ");
if(((brightness(time, 8*HOUR+30*MINUTE, 21*HOUR+30*MINUTE))*100/255) < 10) {
lcd.print("0");
}
lcd.print((brightness(time, 8*HOUR+30*MINUTE, 21*HOUR+30*MINUTE))*100/255);
lcd.print("% ");
//******************************************************************************************************************************** Rot
/*erial.println("U: ");
if(((brightness(time, 8*HOUR, 22*HOUR))*100/255) < 10) {
Serial.println("0");
}
Serial.println((brightness(time, 8*HOUR, 22*HOUR))*100/255);
Serial.println("%");
*/
//********************************************************************************************************************************
lcd.setCursor (0,3);
lcd.print("T: ");
lcd.print(temp1);
lcd.print('\xDF');
lcd.print("C ");
lcd.setCursor(9,3);
lcd.print("Fan: ");
lcd.print(fan/2.55);
lcd.print("% ");
}
byte brightness(unsigned long time, unsigned long fadeUpStart, unsigned long fadeDownStart)
{
// Mid day, light is at maximum brightness
if (time >= fadeUpStart + HOUR && time <= fadeDownStart)
return TARGET_BRIGHTNESS;
// Dawn: fade up the light
if (time >= fadeUpStart && time <= fadeUpStart + HOUR) // Fading up
{
unsigned long seconds = time - fadeUpStart; // Number of seconds into the fade time
return TARGET_BRIGHTNESS * seconds / (HOUR); // Fade up based on portion of interval completed.
}
// Evening: Fade down the light
if (time >= fadeDownStart && time <= fadeDownStart + HOUR) // Fading down
{
unsigned long seconds = (fadeDownStart + (HOUR)) - time; // Number of seconds remaining in the fade time
return TARGET_BRIGHTNESS * seconds / (HOUR); // Fade down based on portion of interval left.
}
// The remaining times are night and the lights is off
return 0; // Shouldn't get here
}
Greetings
