Need Help Dimmer/Timer Project

dimmer timer

Hello, I was wondering if anyone can help me with a project. I need to make a timer that will dim a light according to the moons phases. I have a chart of the days and what percent of light is ommited from the source. I was wondering what I would need to make this. It would be used to mimic the moon phases for a fish tank moonlight. Someone made one and is selling it for 50$. I figure it would be cheaper to make myself if possible. Here is a link to what I am talking about. **broken link removed** Any help would be much apreciated

tca785 dimmer

It's a strange thing to need.But nevertheless here's how I would do it:
A pic 16F84 can have 13 available outputs.Imagine that you have the full-moon face printed on a disk 15cm. in diameter.Behind it put some semitransparent white plastic material.Then behind the disk you make 13 independent compartments opaque to each other.Then put inside 13 white LEDs.
Each LED must have individual resistor so that when all of them are ON,the light will be uniform.
This way not only will you have a very exact representation of the illumination but it will be much more beautiful,too.
The program is very simple (provided it is not the first one you make).The quartz will provide the necessary accuracy and the problem is that you'll have to start the device at a certain moon phase and back the power up so that a power failure does not occur.

timer dimmer

hi

this kind of project publish in epe mag i will search it and upload it for you

fish tank dimmer

thanks for helping...if it works....you guys will save me a lot of money 8)

dimmer tca785

Hello

You can use 4060 as the timer part, and TCA785 as the dimmer part.

Regards