This is a testing site only. See the live Public Lab site here »


leds
leds


Author Comment Last activity Moderation
mimiss "We could have more than one of those larger LED's that we're currently using, but it might be bulky. One bulb on could be green, two bulbs on could..." | Read more » about 3 years ago
warren "true! might it be harder to read a bunch of sensors near each other? depends how theyre positioned i guess... " | Read more » about 3 years ago
mimiss "Moving to something that isn't color based might also help to clear up AQI confusion " | Read more » about 3 years ago
mimiss "The cost would be a bit more, but what about a small strip of LED lights and the number of lights that turn on correlate to the concentration? Simi..." | Read more » about 3 years ago
warren "During a quick chat with @mimiss, we discussed how a clicking sound speeding up or slowing down is used by Geiger counters. Using a blinking light ..." | Read more » about 3 years ago
warren " https://mapknitter.org/maps/solar shows an image like this, using a color mapping which is often used in thermal photography: " | Read more » over 3 years ago
Jorgelopez " This looks very interesting though " | Read more » over 3 years ago
barakkasan " Some say "partial color blindness" actually has more color intelligence than normal people you can see here: frontiersin " | Read more » over 3 years ago
WhiteRabbit "Interesting results! " | Read more » about 8 years ago
WhiteRabbit "Thank you for the very nice write-up. FWIW, it might be that you can get light in a narrower bandwidth from a point source than from an LED: http..." | Read more » about 8 years ago
warren "I know some people use the magnetic film from floppy disks, and I think i have some, if you want to try. " | Read more » about 9 years ago
nedhorning "There are gel and glass NIR-block filters that you can buy that do a pretty good job at blocking visible light. There might also be some other free..." | Read more » about 9 years ago
mrrg "Is it not possible to eliminate the visible light? " | Read more » about 9 years ago
mathew "Nice work with the LEDs. Look forward to seeing the setup at the Barnraising. " | Read more » about 9 years ago
warren " " | Read more » about 9 years ago
cfastie "The relative amounts of NIR vs visible light in each channel is definitely a big and important unknown. The camera can't do anything to change that..." | Read more » about 9 years ago
nedhorning "With the Infrablue filter there is both visible and NIR light hitting the camera sensor and it would be helpful to know how different wavelengths a..." | Read more » about 9 years ago
mrrg "okay, I was thinking you do not need to characterize it just treat all of it as NIR if you have a good filter.. Why do you need to characterize it?..." | Read more » about 9 years ago
warren "I guess the WB introduces a big unknown about the relative amounts of NIR vs visible light. One way the NIR and VIS might mix in blue is that perha..." | Read more » about 9 years ago
nedhorning "Sorry for not explaining this better. We were just trying to understand which sensor channels are recording which wavelengths of light. The images ..." | Read more » about 9 years ago
mrrg "Maybe I have misunderstod what you try to do.. but what if you add thicker sheet of HDPE plastic in front of the camera then only NIR would get thr..." | Read more » about 9 years ago
nedhorning "Thanks for posting this Jeff. The results are interesting. Most of the LEDs that I've seen have band widths in the 5nm - 10nm range. It's important..." | Read more » about 9 years ago
straylight "wow, good results jeff, as it happens, I'm about to do a similar test on some filters which we use for another experiment. It is rather important t..." | Read more » about 9 years ago