Thanx for all your replies. I really appreciate it.
There is an easier way to achieve your goals, don't draw the curtains and leave a window open.
That unfortunately is not an option for me. Living close to a nightclub with spotlights shining in the direction of my windows, makes it a bit difficult for me to get to sleep without closing some of my windows and drawing the curtains. If only life was so straight forward.
I’ve done a bit of searching and found these 12v led strips:
http://www.oznium.co.za/led-lights/wate ... rip-light/
I would go for the premium strips. The warm and cool white ones produce 300 Lumens per meter while using about 5w/meter. There is also a RBG option @250 lumens/m.
I have three questions regarding this product:
My main worry is not waking up due to not enough light being produced. Is 250/300 lumens enough or do you think ill need 2 meters?
Should i rather go for the RGB strip? Will it be worth it sacrificing 50 lumens? Would you?
If i go with the white strips, should i go for the cool or warm one?
I see the colour temp of horizon daylight is about 5000K
https://en.wikipedia.org/wiki/Color_tem ... t_lighting
Lumens during sunset/rising is about 400
https://en.wikipedia.org/wiki/Daylight# ... conditions
I have spoken to someone studying electrical engineering and they have also advised me to use a method called pulse width modulation.
Would you advise me on using something like a Humble pi prototyping board or is there something that will fit my needs better?
Ok, the following is a wild in-the-dark guess, please correct me if im wrong;
Regarding the power supply; i would like to be able to only have to use a single PSU. While searching for power supplies that would supply at least 2A, and seeing how much they go for, i immediately thought, why couldn’t i just use a computer atx PSU and power it all from there. It already has separate 5v and 12v outputs; that would mean i could get away without using a voltage regulator to supply the pi with its needed 5v. I could connect the standby 5v to the pi and send a signal to the PSU when i need the 12v to start coming on. This would avoid the need to have the psu on the whole time (having that fan blow through the night is surely going to disturb me).
Ok so now here comes the question: Is it possible to do the needed PWM by signalling the PSU directly from the GPIO's? Ive done a bit of reading and as far as ive read, atx psu's actually work by means of 'switching' which involves PWM. Can i not tap into this and PWM the 12v line by only sending signals from the pi?
Can i get away with only using the GPIO pins and doing all of this using coding?
Thanx for all of your inputs Guys! I know i am not the only one who is going to appreciate it