| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "This is very clever. I wonder whether the memory in a Atmega 328p can be used to store data. I wonder if it is possible to access those data later...." | Read more » | almost 7 years ago | |||
| cfastie | "There is a growing list of logger options and specs in a Google sheet. Please add information there if you know other stuff. " | Read more » | almost 7 years ago | |||
| cfastie | "That Openlog is tiny! It combines an Arduino 328p with a microSD card, but still needs an RTC. There are clones of it available for $7.00. I have ..." | Read more » | almost 7 years ago | |||
| cfastie | "Are you interested in the difference between a blue filter and a red filter? A blue filter could be referred to as NGB (red is blocked and NIR repl..." | Read more » | about 7 years ago | |||
| cfastie | "I am not familiar with the optics equations. My approach would be to enable precise adjustments of the components and find the best resolution (cri..." | Read more » | about 7 years ago | |||
| cfastie | "Yes, we are going to change the pixel values in our photo. For each pixel in the photo we have taken of vegetation, we use the DN in the red channe..." | Read more » | about 7 years ago | |||
| cfastie | "I think the Public Lab Infragram camera has a red filter, so the red channel will capture mostly red light. The blue channel will capture mostly NI..." | Read more » | about 7 years ago | |||
| cfastie | "Update: The u-blox NEO-7M board can be powered with either 3.3 or 5 volts. The GPS module itself is not tolerant of more than 3.6 v, but the board ..." | Read more » | about 7 years ago | |||
| cfastie | "That's a good result from Infragram.org. The result could be different outside because the color of the light can influence the proportion of visib..." | Read more » | about 7 years ago | |||
| cfastie | "I guess I demonstrated that the u-blox is protected someway or another from voltage over the stated 3.6v max. I was using four eneloop AAA (4 x 1.2..." | Read more » | about 7 years ago | |||
| cfastie | "Some blue filters including Wratten 47, Schott BG3, and Rosco 2007 are dual bandpass red-rejection filters. They require that blue light be used fo..." | Read more » | about 7 years ago | |||
| cfastie | "Stitching Mobius photos can be hard. The longer lens will help. Correcting the distortion afterwards can help. A high shutter speed and vibration d..." | Read more » | about 7 years ago | |||
| cfastie | " The red filters typically used do not transmit much green light, so the green channel captures mostly NIR. Some yellow filters pass red and green,..." | Read more » | about 7 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 | "With certain red filters replacing the NIR cut filter, instead of red, green, and blue channels, you get red+NIR, NIR, and NIR channels. Without ad..." | Read more » | about 7 years ago | |||
| cfastie | "When the NIR cut filter is removed from a camera, all three color channels capture NIR light in addition to the color they originally captured (R, ..." | Read more » | about 7 years ago | |||
| cfastie | "Those male + female headers would be really handy. This is the first time I have used a Nano without headers, and it makes a really tidy package fo..." | Read more » | about 7 years ago | |||
| cfastie | "Hi Liz, The components wired together weigh 33 grams and the bracket weighs 8 g. The batteries to power it weigh a lot more than that. A case with ..." | Read more » | about 7 years ago | |||
| cfastie | "The text file attached above gives the correct RGB values for the NDVI_VGYRM lookup table. I put an image of the NDVI_VGYRM color gradient in my an..." | Read more » | about 7 years ago | |||
| cfastie | "I think the algorithm to convert a blue- or red-filtered NIR photo to color NDVI is something like this: Start with a color photo in which one ch..." | Read more » | about 7 years ago | |||
| cfastie | "Peegar is an academic project at the University of Tokyo which provides browser-based graphical programming of a microcontroller. It "uses audio c..." | Read more » | about 7 years ago | |||
| cfastie | "Regarding using a battery with voltage near the top of the acceptable range, apparently some voltage regulators convert the voltage to the desired ..." | Read more » | about 7 years ago | |||
| cfastie | "I don't know how low the voltage has to get before the Riffle starts to misbehave. @Donblair designated the 3.5v to 6v range, so he must have based..." | Read more » | about 7 years ago | |||
| cfastie | "What are the voltage requirements: are there upper and lower limits? The silkscreen on the Riffle says 3.5v to 6v for the "general" power connecti..." | Read more » | about 7 years ago |