| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "The first two times I tried the Rev. P wind sensor, I also tried the Rev. C sensor. The Rev. C sensor did not work as well as the Rev. P, so I focu..." | Read more » | over 6 years ago | |||
| cfastie | "It’s fairly straightforward to use the Modern Device Wind Sensors with either a Mini Pearl Logger or a Nano Data Logger. I had great success with t..." | Read more » | over 6 years ago | |||
| cfastie | "Sodium lamps have very distinctive spectral emissions, so it is fairly easy to distinguish them from other types of lamps. Once you become familiar..." | Read more » | over 6 years ago | |||
| cfastie | "I have tried several times to adjust the histogram of bad infrared photos. It has always failed and I don't know why. I assume it is because the ad..." | Read more » | almost 7 years ago | |||
| cfastie | "A single camera NDVI system with a red filter should produce a photo with very turquoise foliage. The blue channel (NIR) should be much brighter th..." | Read more » | almost 7 years ago | |||
| cfastie | "I have not used graphing for live debugging because I didn't know how easy it was to do. I use the live serial monitor in the Arduino IDE all the t..." | Read more » | almost 7 years ago | |||
| cfastie | "This is a terrific result for one of your first flights. The photography is very high quality because of the good decisions you made. If this is yo..." | Read more » | almost 7 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 » | almost 7 years ago | |||
| cfastie | "This is a great trick. I have made a bunch of these. If you are doing this with a cheap USB cable, you might want to check the red and black wires ..." | Read more » | almost 7 years ago | |||
| cfastie | "There is also lots of good information in this research note by Don about some testing he did. " | Read more » | almost 7 years ago | |||
| cfastie | "There has been a lot of information about measuring turbidity posted at Public Lab. Don Blair posted an excellent review of the common approaches t..." | Read more » | almost 7 years ago | |||
| cfastie | "Kestrel makes a well-thought-out data logger called Kestrel Drop. The Drop D2 logs temperature and humidity apparently for six months. You can retr..." | Read more » | almost 7 years ago | |||
| cfastie | "Spectrometers based on consumer cameras, like the Public Lab spectrometers, can be built so they provide good information about which narrow wavele..." | Read more » | almost 7 years ago | |||
| cfastie | "First, mark the position of the three screws. When you remove them, count the number of rotations needed to unscrew them. So you will need marks on..." | Read more » | almost 7 years ago | |||
| cfastie | "The rules for flying drones are different from the rules for flying kites or balloons. The rule that flying is prohibited within five miles of an a..." | Read more » | almost 7 years ago | |||
| cfastie | "The Public Lab desktop spectrometer is quite capable of making a spectral graph of sunlight reflected from grass. The curve will differ from the pr..." | Read more » | almost 7 years ago | |||
| cfastie | "An infragram photo file does not contain enough information to produce a normal color image of the scene. The infragram filter blocks most of the b..." | Read more » | almost 7 years ago | |||
| cfastie | "So, the values in the graph are computed as follows? The values from the camera for each channel (R, G, B) range from 0 (no light) to 255 (maximum..." | Read more » | almost 7 years ago | |||
| cfastie | "The signature of ripe coconuts might be distinguishable from some of the other things in the photos, but not necessarily everything else in the pho..." | Read more » | almost 7 years ago | |||
| cfastie | "I don't know of published results of studies comparing red and blue filters. Red light has been used for the visible part of the NDVI equation for ..." | Read more » | almost 7 years ago | |||
| cfastie | "Computing NDVI requires a value for the "brightness" of both red light and near infrared light for the same part of a scene (or for each pixel). Un..." | Read more » | almost 7 years ago | |||
| cfastie | "Yes, I agree that this is a different approach to an issue that has had a lot of effort directed at software solutions. This is a purely hardware s..." | Read more » | almost 7 years ago | |||
| cfastie | "Hi Adam, Those thermoelectric fans are very smart. This guy on YouTube shows how to make one with a $3.00 thermoelectric module and parts recycled..." | Read more » | almost 7 years ago | |||
| cfastie | "Oh, you're right. The older lut used in the images above can be found here: https://publiclab.org/wiki/photo-monitoring-plugin " | Read more » | almost 7 years ago |