Comments

Author Comment Last activity Moderation
cfastie "I have not tried MAPS.ME. It looks like it allows you to save base map data to your phone while you have a data connection, and then display the ma..." | Read more » about 5 years ago
cfastie "I can't tell from the photo what kind of filter your camera has. My guess would be that it is a blue filter, so the red channel would be mostly NIR..." | Read more » about 5 years ago
cfastie "Ah, I see. Those keywords, DATE and TIME, refer to the time the sketch was compiled and are saved on the Arduino until a new sketch is loaded. Tha..." | Read more » about 5 years ago
cfastie "Liz is correct. Most smartphones have very good GPS hardware. If you take a photo at a sampling location, that photo should have location coordinat..." | Read more » about 5 years ago
cfastie "Those battery eliminators are legitimate products. Canon makes them for some of its PowerShots. The AC to DC converter takes wall power and deliver..." | Read more » about 5 years ago
cfastie "Point and shoot cameras typically last a few hours when running on batteries. Trail cameras typically last a few months to a year because they ente..." | Read more » about 5 years ago
cfastie "Setting a custom white balance on the Mobius camera can be done numerically. Determining which numbers to use requires trial and error and subjecti..." | Read more » about 5 years ago
cfastie "Although the full range of near infrared transmission of the Rosco 19 filter has not been measured (by anyone we know about ), we are not without t..." | Read more » about 5 years ago
cfastie "The spectral response graphs supplied by Rosco don't go past 740 nm. So we are assuming that there is some transmission farther into the near infra..." | Read more » about 5 years ago
cfastie "I guess the method would be deriving NDVI from inexpensive sensors (not cameras) operated by a microcontroller. There might be a better sensor (or ..." | Read more » about 5 years ago
cfastie "I've made a couple of those I2C hubs and they are very handy. They're fun to make too. I now put a little super glue between the header plastic bef..." | Read more » about 5 years ago
cfastie "Do you think i need the targets of known spectral reflectivity in the same bands that will be used to compute NDVI or it can be tested with any mat..." | Read more » about 5 years ago
cfastie "Rosco 19: https://publiclab.org/notes/mathew/04-29-2014/a-wratten-25a-replacement-from-rosco Rosco 2007: http://legacy.rosco.com/filters/SED.cfm?t..." | Read more » about 5 years ago
cfastie "That would be terrific if a ferrite bead eliminated the noise I was seeing. My impression was that the bead was protection against radio frequency ..." | Read more » about 5 years ago
cfastie "Thanks Ed, It's good to know there is hope for the Nano. That's an excellent thread you linked to. I might try removing the LED resistor and the r..." | Read more » about 5 years ago
cfastie "Xose, Thanks for pointing to those Grove I2C hubs. I had been pondering how to fork the I2C line. Here is my attempt to make an I2C hub from male h..." | Read more » about 5 years ago
cfastie "I figured out what I was doing wrong with the real time clock. This line in a sketch: RTC.adjust(DateTime((__DATE__), (__TIME__))); will set t..." | Read more » about 5 years ago
cfastie "A nice thing about DuPont jumper wires is that each wire has a separate connector. So pin pitch does not matter (if it is at least 0.1 inch, the Ar..." | Read more » about 5 years ago
cfastie "That's a nice little I2C hub. Maybe it would be easy to make something like that for DuPont wires from strips of male header: But somebody would..." | Read more » about 5 years ago
cfastie "Are you storing data in RAM on the Pi? In a RAM drive? Do these data persist after the Pi is powered down? Is this Pi always connected to a compute..." | Read more » about 5 years ago
cfastie "Can you share an example of your spectra? Are they on Spectral Workbench? What spectrometer did you use? Are you interested in a more precise scal..." | Read more » about 5 years ago
cfastie "This is a really intriguing project. The Seek camera makes possible a lot of otherwise very difficult investigations. It should be straightforward ..." | Read more » about 5 years ago
cfastie "It appears that storing data in flash memory on an Arduino is not so easy. The PROGMEM keyword only works for writing constants before the main lo..." | Read more » about 5 years ago
cfastie "It seems that it might be straightforward to store arrays of data in the 32k of flash memory in a 328p chip. Flash memory is non-volatile and your ..." | Read more » about 5 years ago