Comments

Author Comment Last activity Moderation
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 » over 2 years 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 » over 2 years 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 » over 2 years ago
cfastie "The inexpensive red and blue filters used in DIY single camera NDVI systems typically block most green light. So the camera's green channel capture..." | Read more » over 2 years ago
cfastie "If you are taking a still photo every hour or so, you might be able to take a flash photo. A split second flash of visible light might not interfer..." | Read more » over 2 years ago
cfastie "I'm not sure burning paper or wood are hot enough to cause the atomic emission of elements like sodium. The doublet emission lines of sodium are pr..." | Read more » over 2 years ago
cfastie "Yes, any gas will be less dense when it is hotter and therefore will have more lift. If the gas inside the balloon is the same as the gas outside (..." | Read more » over 2 years ago
cfastie "That's a great development. Thanks for alerting me to that. The key to this advance is knowing how to structure the KML code to define the color of..." | Read more » over 2 years ago
cfastie "Low power operation: To run your data logger for a long time on small batteries, you can put the Arduino and other components to sleep between log..." | Read more » over 2 years ago
cfastie " Marking your kite or balloon line is a very good way to do this. It is a bit of a chore to do it, but maybe easier than building a data logger or ..." | Read more » over 2 years ago
cfastie " Enter, Inventor, Mentor " | Read more » over 2 years ago
cfastie " That's a good idea. Maybe someone has figured out good values for blue and red. " | Read more » over 2 years ago
cfastie " The link was finally fixed on May 16, 2019 when the view count was 1005. " | Read more » over 2 years ago
cfastie " The NDVI result will be the same whether you use one or more layers of filter. Using two layers reduces the amount of light reaching the sensor tw..." | Read more » over 2 years ago
cfastie "The specs for the TPL-5110 timer IC say it can time intervals up to 7200 seconds (2 hours). It seems unlikely that it could be extended beyond that..." | Read more » over 2 years ago
cfastie " I just noticed that at least some of the 2000 era Olympus Camedia cameras did not have an effective IR cut filter installed. For normal photograph..." | Read more » over 2 years ago
cfastie "The focal length of the lens depends on your goals, the area you want to cover, the elevation of the drone, how much distortion (fish eye) you can ..." | Read more » over 2 years ago
cfastie "The Olympus CAMEDIA C-3040 is a nineteen year old model with a 3 MP sensor. It has a larger sensor than a GoPro, but the image quality will be very..." | Read more » over 2 years ago
cfastie "According to the link at your wiki the RGB LEDs are rated for 2 to 3.2 volts. Your instructions for connecting the LED indicate connecting the LED ..." | Read more » over 2 years ago
cfastie "Hi tahnok, Those inexpensive anemometers seems to be missing an important feature of the expensive Kestrel and other fancy anemometers. They do no..." | Read more » over 2 years ago
cfastie "The standard (last generation) Arduinos are circuit boards with the ATmega 328p microcontroller chip on them. A common hacker exercise eight years ..." | Read more » almost 3 years ago
cfastie " More clarification on the display: For a battery powered logger, you could use an e-paper (e-ink) display which retains the image after it has bee..." | Read more » almost 3 years ago
cfastie "I'm glad this might help. One clarification to my comment above: Adding a display to the logger works best if the logger is plugged into the wall (..." | Read more » almost 3 years ago
cfastie "It is quite easy to build the environmental data logger you describe for $15. All of the parts for a Mini Pearl Logger can be ordered from eBay for..." | Read more » almost 3 years ago