Comments

Author Comment Last activity Moderation
cfastie "I know nothing about this topic, but here is the model I concocted from whole cloth to understand it. Measuring conductivity of water with electro..." | Read more » over 6 years ago
cfastie "A simple option might be to turn on some NIR LEDs when the photography happens. The NIR:VIS ratio might not match sunlight, but if you know what it..." | Read more » almost 7 years ago
cfastie "Thanks for adding a photo. NDVI is based on the assumption that the light illuminating the foliage has a certain proportion of NIR and VIS -- the p..." | Read more » almost 7 years ago
cfastie "Using two cameras solves one of the two problems I described (mixed NIR and VIS). That problem can also be solved by measuring or making assumption..." | Read more » almost 7 years ago
cfastie "I haven't used the Pi NoIR cam and have not seen your photos, so I can only respond from general principles. Camera sensors are not as sensitive ..." | Read more » almost 7 years ago
cfastie "The configuration with the stopper held in firmly with the threaded bottle cap looks really good. How hard is it to get that to work, i.e., to get ..." | Read more » over 8 years ago
cfastie "This looks like a surefire way to waterproof the wires. But now you have to waterproof the seal between the stopper and the bottle. Plastic water b..." | Read more » over 8 years ago
cfastie "New data: I posted about the SkyShield at the KAP forum and got two orders in 24 hours, both for the solder-yourself kit! So disregard everything I..." | Read more » over 8 years ago
cfastie "This solder-yourself thing is a tough issue. The Riffle itself is always going to be surface mount, so you are going to have to manufacture them so..." | Read more » over 8 years ago
cfastie "Neil, Yes, the window slime will probably have to be removed every couple of weeks. Or maybe window transparency could be monitored with a separat..." | Read more » over 8 years ago
cfastie "Here's another design of an indestructible underwater housing. You should be able to build one with hardware store parts for under $15. No mirrors..." | Read more » over 8 years ago
cfastie "That's a great idea to use rice to make the bottle non-compressible. It can also keep your payload dry if a little water leaks in. For the testing ..." | Read more » about 9 years ago
cfastie "This is a good definition of the problem: "..sensors be exchanged easily between bottles and; caps seal between sensors and bottles with cheap, of..." | Read more » over 9 years ago
cfastie "The first time i have ever found a tree frog in my house was at the LEAFFEST where the Coqui was built, tested, and designed for PCB. . . Clearly..." | Read more » over 9 years ago