Showerthoughts

29623 readers

1141 users here now

A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.

Rules

All posts must be showerthoughts
The entire showerthought must be in the title
Avoid politics (NEW RULE as of 5 Nov 2024, trying it out)
Posts must be original/unique
Adhere to Lemmy's Code of Conduct

founded 1 year ago

MODERATORS

Night lights that detect light levels are probably flickering so fast that it just appears to be on (self.showerthoughts)

submitted 7 months ago by rockSlayer to c/showerthoughts

17 comments fedilink hide all child comments

Ok so I got this idea not while showering, but because I'm very high. The story does come from my bathroom though! I have a night light in my bathroom, and I was looking at the night light as I turned off the bathroom light. I'm a big nerd so I remembered that the things that detect light levels are actually diodes wired in reverse. I thought it would be funny to make it flicker by reflecting the light back on the diode, but it didn't work. That's when I had this realization

you are viewing a single comment's thread
view the rest of the comments

[–] rockSlayer 4 points 7 months ago (1 children)

I was going to protest this, but then I started looking into how ac is converted to dc and realized that it would be cheaper to just let the diodes run on ac.

oh shit, my stoned ass wasn't prepared for this

[–] [email protected] 4 points 7 months ago* (last edited 7 months ago)

Indeed, older bulbs work in both directions and the voltage fluctuation isn't visible in the light emitted, because the thermal mass of the filament smooths out the alternating current into a continuous glow.

But LEDs will flicker unless the AC is rectified and smoothed out. Cheap lights will just not come with the circuitry to do this, as you can just hook up the diode directly, the only drawback being it will only emit light some of time. 60Hz is slow enough that you will notice it, however. Especially with movement, it makes reality look like it's running at 60fps.

Even when rectified, unless a capacitor is added to the circuit, LEDs will flicker. AC merely rectified will still have the voltage hitting zero 60 times a second, otherwise.