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Another Arduino LED light schedule sketch

29794 Views 109 Replies 23 Participants Last post by  boxhead1990
Here is the Arduino code I use to control the schedule of my LED lights.

Back story:
I've been redoing my 14G low-tech and wanted to try out LED, so I ordered a 10W ebay-special and planned to hook it up to an Arduino I had lying around. While waiting for it to arrive, I looked around for examples of how others had handled the software side of things. None of the code I found seemed to fit my needs.
I realize a lot of people have done the same, but I wanted something that allowed for individual schedules for any number of channels, including siesta and different length sunrise/sunset.

So in the end, I wrote my own code to control the lights.

Some things that need to be addressed before looking at the code:

1: This is not a complete sketch to control aquarium lights!
While it would work on a setup identical to mine, it wouldn't on much else. The code is meant as a helping hand for those that are not overly comfortable with programming, and find handling more complicated schedules difficult. I have removed all but the essentials in this sketch.

2: This has nothing to do with your hardware!
Ok, that may not be strictly true. But my point is: There are a lot of great guides out there regarding the hardware side of things, I will only be dealing with the software. This is the part that I have found relatively little of on these forums, whereas the hardware gurus seem very active. I provide a way to control the PWM signal, the rest is up to you.

Now, let's get started! :)

Features:
- Any number of individual channels (limited by you Arduino's number of PWM pins)
- Pretty much any light schedule that repeats every 24 hours
- Suitable for RGB lights
- Reasonably smooth fading w. a resolution of 1/255 updated every second

Hardware requirements:
- Arduino (Uno in my case)
- RTC module (DS1307 is used in the example)
- PWM outputs wired CORRECTLY to your LED drivers

Other requirements:
- Some (not necessarily a lot) proficiency with Arduino coding

There are a lot of comments in the code, and I hope it is not too difficult to understand.

UPDATE:
I have made a considerable rewrite, making it much easier to add more channels.
Concept explained:

A lot of this is explained in the code, but I'll try to summarize it here.
To define a schedule for a channel, you set a series of 'Points'. This should be considered a chart, where the line represents the intensity of light over a 24 hour period.
Intensity is a value in the range 0-255. 0 = OFF, 255 = Fully ON

To make lights turn on in the morning with a 30 minute 'sunrise', you would add 2 Points:
08:00 - Intensity = 0
08:30 - Intensity = 255

Explanation:
From 08:00 to 08:30 channel is going from 0-255

It's pretty simple, really.

:sleep: Enough rambling, here is the code. Let me know if you have questions or find it useful!

Link to source:
[STRIKE]http://codebender.cc/sketch:4232[/STRIKE]
EDIT:
New location of source:
https://github.com/benjaf/LightController
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Just a thought that might be my answer...

The function is only finding 2 channels when I have 9. Now, I did not change the code and left it as it was originally written...which was for a 2 channel set-up.

I am now thinking I will need to expand upon the function in order to find all channels and periods.
Does that sound like I may be on the right track??

Thanks for anything.
Did you change the #define lines for CHANNELS & MAXPERIODS?

It also looks like you need to update the int lightvalue[CHANNELS]= to

int lightvalue[CHANNELS] = { 0, 0, 0, 0, 0 };

The same type of things need to be done whenever the phrase ...and so on shows up in the code. Without that change, the pins themselves won't be initialized (for pinMode statements) or updated (for analogWrite statements)
 
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