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**isn't the same effect achieved by using a normal radio alarm tuned to any regional commercial radio station | **isn't the same effect achieved by using a normal radio alarm tuned to any regional commercial radio station | ||
***no, they mostly start with bieber and, although it's beyond belief, proceed to something even worse such as rap or some whiny R&B. | ***no, they mostly start with bieber and, although it's beyond belief, proceed to something even worse such as rap or some whiny R&B. | ||
== Prototypes == | |||
=== [[User:Robert|Robert]] 1A === | |||
:'''''Status:''' Awaiting purchase of TRIACs and a suitable lightbulb.'' | |||
I am currently working on an initial prototype of the dawn light functionality, the following features are intended in this version: | |||
# Dawn light (light switches on automatically over a period of ~30 minutes at a specified time) | |||
# Reverse sunlight matching (when this mode enabled the light turns off gradually at sunrise, and turns on gradually at sunset) | |||
# Instant on/off | |||
# Instant dawn/dusk (switches the light on/off over a period of ~30 minutes) | |||
# Adjustable brightness via a potentiometer (sets the current brightness in mode 3; sets the maximum brightness in modes 1, 2, and 4) | |||
The prototype will use an incandescent light bulb and Arduino, with the lamp controlled by a optocoupler TRIAC driver - while this may not be the best solution for a final version, it is sufficient to allow a small number of units to be produced. | |||
Thus far the following components have been acquired/will be acquired: | |||
* [http://uk.farnell.com/vishay/k3020p/optocoupler-triac-driver/dp/1045438 K3020P - OPTOCOUPLER, TRIAC DRIVER] (£0.37 per unit) | |||
* [http://uk.farnell.com/pro-elec/22-318-3909-90/lamp-holder-e27/dp/4743076 E27 LAMP HOLDER] (£0.78 per unit) | |||
'''Total:''' £1.15 per unit. | |||
Although an Arduino is used in the prototype, it is imagined that this would be replaced with a proper control PCB in a final version. | |||
