No light clock
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

No light clock

by nivin37 on Tue Dec 11, 2012 7:10 pm


After reading a blog about any light upsetting your sleep, so I turned off my bright led alarm clock & put it in the draw. We both have been sleeping better. Not sure if it's because the clock is no longer looking at me all night or not!

So now I would like to make a clock that does not use any form of light at all. I know this will make it hard to read at times, however most times I'm hoping it will be ok.

I thought of some kind of LCD with the back light off & I'm now looking for a suitable device and or any ideas.



Posts: 3
Joined: Tue Dec 11, 2012 7:01 pm
Location: Melbourne, Australia

Re: No light clock

by experimentalist on Tue Dec 11, 2012 9:39 pm

Well one thing you can do is have an autodimmer for the LED clock at night.

To determine daytime or nighttime you can either use a photocell, and dim the LED display when the photocell detects darkness/dusk/night and brighten back up when the environment is bright. You can also change the brightness by time of day. Whatever hours you sleep, make it dim. Light it up for your waking hour and throughout the day.

The other option is to do as you said use an LCD with a backlight. But LCD backlights are just LEDs and can also distract at night, so again the auto dimming option may stil be necessary.
Posts: 11
Joined: Sun Aug 07, 2011 4:10 pm

Re: No light clock

by adafruit_support_bill on Wed Dec 12, 2012 7:03 am

All of the LCD displays that we carry have independently controllable back-lights. The RGB backlight versions give you the ability to tune the color of the backlight as well. You might find that some colors are less disturbing at night.

Most of these displays are somewhat readable in normal lighting conditions with the backlight turned off.

Posts: 62220
Joined: Sat Feb 07, 2009 10:11 am

Re: No light clock

by odometer on Tue Dec 18, 2012 8:19 pm

You can make a display which uses neither LEDs nor LCDs, out of these:
Posts: 98
Joined: Sun Aug 21, 2011 11:01 pm

Please be positive and constructive with your questions and comments.