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cfastie "The Arduino snow depth gauge seems to produce good data. It is an ESP8266 and laser rangefinder I2C sensor ($9 total cost). As expected data collec..." | Read more » 13 days ago
cfastie "The sunlight is not an issue. For a winter-long monitoring goal, a few measurements every day are plenty, and those can be taken at night. With the..." | Read more » 22 days ago
cfastie "I tried one of those little six dollar laser rangefinders (vl53lox) for measuring distance to snow. Those rangefinders don't work at all in sunligh..." | Read more » 23 days ago
cfastie "I think a laser rangefinder might work well for this. Put it on a pole and point it downward to measure the distance from the rangefinder to the sn..." | Read more » 27 days ago
cfastie "Using green foliage (or chlorophyll) to set a custom white balance deserves more consideration than I gave it in my last comment. Foliage absorbs r..." | Read more » about 1 month ago
cfastie "The goal of the custom white balance hack is to fool the camera into wildly exaggerating the brightness of the blue channel (when using a red filte..." | Read more » about 1 month ago
cfastie "If your K610 filter is a cutoff filter that passes wavelengths greater than 610nm and blocks shorter wavelengths, then it is similar to many filter..." | Read more » about 1 month ago
cfastie "`>> for simple bandpass filters, I use the letter "K" followed by the approximate cutoff wavelength Are your filters bandpass filters or cut..." | Read more » about 1 month ago
cfastie "I have not heard of anyone using a microcontroller (Arduino or ESP board) to read data from an SD card. But maybe it is possible. A more common str..." | Read more » about 1 month ago
cfastie "I haven't tried that Feather combination. I have also never seen a list of Feather-Featherwing combinations that are incompatible. So I assume it w..." | Read more » about 2 months ago
cfastie "It looks like the PIC12LF will do what you need. There is also a low power 555 timer (TLC555) but it is not as low power as the PIC12LF. " | Read more » 2 months ago
cfastie "The TPL5110 depends on getting a signal to the DONE pin, so I am not sure it can just send a pulse every eight seconds. The TPL5111 sets an enable ..." | Read more » 3 months ago
cfastie "I think NDVI will provide some information about the photosynthetic rate of mosses. Moss leaves capable of rapid photosynthesis will probably be ab..." | Read more » 3 months ago
cfastie "I'm not familiar with the details, but I think the goal was to protect the sensor from precipitation (the outer can), radiation (the aluminum foil ..." | Read more » 3 months ago
cfastie "`>>Is it possible to use an NIR sensitive camera to take the image and then use the red and the NIR as two separate copies of the same image ..." | Read more » 4 months ago
cfastie "`>>So according to this we should be getting about 10% transmission of red light, does that mean I should subtract 10% of each pixel value in..." | Read more » 5 months ago
cfastie "I don't know for sure whether your protocol with the RPi camera (use automatic white balance with blue paper) and my protocol with a Powershot (use..." | Read more » 5 months ago
cfastie "I am not familiar with your white balance procedure so I don't know how it is affecting your results. If you can manually set the white balance, se..." | Read more » 5 months ago
cfastie "This is a fun idea. l assume the bioluminescence will be detected only at night since it will be swamped by sunlight during the day. At night, biol..." | Read more » 5 months ago
cfastie "That's really useful information. I can see the advantage of having every scientific instrument accessible on the web or network. Being able to rem..." | Read more » 5 months ago
cfastie "I’m intrigued by the idea that students should “learn the foundational skills with the command line that, in the long run, will make it much easier..." | Read more » 5 months ago
cfastie "@lfent, Is there any difference between using two filters and using one filter if both photos are exposed so the photos have the same general brigh..." | Read more » 5 months ago
cfastie "It looks like you have made a really good start with this project. I agree that a challenge will be to avoid scaring away the neighborhood resident..." | Read more » 5 months ago
cfastie "@warren is correct that some synthetic materials reflect a lot of NIR and not much red, so NDVI computes to a high value (NIR-red will be similar t..." | Read more » 6 months ago