Comments

Author Comment Last activity Moderation
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 » over 4 years ago
cfastie "You are right that there has not been much follow-through at Public Lab on developing and testing DIY conductivity or total dissolved solids (TDS) ..." | Read more » over 5 years ago
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 » about 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 » over 6 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 » over 6 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 » over 6 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 » over 6 years ago
cfastie "I have not worked with water chemistry sensors, but your first impression might be a good one -- a device that can send encoded concentrations of N..." | Read more » about 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