| 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 4 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 4 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 4 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 4 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 4 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 » | almost 5 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 » | almost 5 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 » | almost 5 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 » | almost 5 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 » | almost 5 years ago | |||
| cfastie | " Enter, Inventor, Mentor " | Read more » | almost 5 years ago | |||
| cfastie | " That's a good idea. Maybe someone has figured out good values for blue and red. " | Read more » | almost 5 years ago | |||
| cfastie | " The link was finally fixed on May 16, 2019 when the view count was 1005. " | Read more » | almost 5 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 » | almost 5 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 » | almost 5 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 » | almost 5 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 » | almost 5 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 » | almost 5 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 » | almost 5 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 » | almost 5 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 » | about 5 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 » | about 5 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 » | about 5 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 » | about 5 years ago |