| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 | "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 | "I like the idea of linking to other notes that set the stage for the current one. I was using the response:##### powertag for a while, but that doe..." | Read more » | about 7 years ago | |||
| cfastie | "Thanks Jeff. That's a really interesting question. I did not include step by step instructions, so a complete novice would have to do some research..." | Read more » | about 7 years ago | |||
| cfastie | "Although there are sensors that require more than 3.3V, most of the simple DIY sensors are designed to use 3.3V. For example, all of the sensors he..." | Read more » | about 7 years ago | |||
| cfastie | "Further empirical evidence suggests that the VBAT pin delivers the voltage of the battery that is plugged into the "Lithium 3.7V" connector, but no..." | Read more » | about 7 years ago | |||
| cfastie | "Evidence suggests my answer is wrong. I powered a Riffle with a battery pack which supplied 4.5V, but the VBAT pin supplied only 2.3V. So maybe it'..." | Read more » | about 7 years ago | |||
| cfastie | "Hi Shanlter, That's a good question. There is no 5V-out pin on the Riffle, but there is a "VBAT" pin on the 2x7 pin header. I assume that pin carr..." | Read more » | about 7 years ago | |||
| cfastie | "Thanks Zengirl. I don't think you can buy a NASA Aeropod. You can license the technology from NASA and manufacture them, but I don't know if anyone..." | Read more » | about 7 years ago | |||
| cfastie | "A goat is way better than brown M&Ms. But that is not exactly my motivation here because I'm sure everybody reads my research notes extremely ..." | Read more » | about 7 years ago | |||
| cfastie | "The Melexis MLX90614 Non-Contact Sensor has a temperature range of -70°C to +380°C. This is an infrared sensor so it does not have to touch the thi..." | Read more » | over 7 years ago | |||
| cfastie | "Leslie, it's really good you got this working. Thanks for troubleshooting the RTC library. It looks like the library I have been using is the MrAlv..." | Read more » | over 7 years ago | |||
| cfastie | "It would be fun to try an Aeropod. I couldn't find any details about the instruments, but it looks like an awesome contraption to fly. " | Read more » | over 7 years ago | |||
| cfastie | "A pitot tube measures air pressure and uses fancy math to relate that to wind speed. I assume the ones on airplanes work better than the Rev P. " | Read more » | over 7 years ago | |||
| cfastie | "I decided not to drop into the rabbit hole of applying time series analysis to these data. There does appear to be some periodicity present, but I ..." | Read more » | over 7 years ago | |||
| cfastie | "I have a hypothesis about the different results obtained with two BME280 sensors on the flying rig. A difference of 3° to 4°C is more than should b..." | Read more » | over 7 years ago | |||
| cfastie | "Yes, the newer Rev. P sensor works better in high wind because it has a strong heater so the wind can't cool it off too fast. But the older Rev C s..." | Read more » | over 7 years ago | |||
| cfastie | "A running mean of the aerial wind speed looks like a very reasonable result. The red line is a running mean of 10 observations (which were six seco..." | Read more » | over 7 years ago | |||
| cfastie | "The Mini Pearl Logger in the compost pile stopped logging today when the battery voltage dropped too low. Four AAA eneloops ran the logger for 13.5..." | Read more » | over 7 years ago | |||
| cfastie | "A data logger based on an Arduino microcontroller is well suited to the task of recording temperature every few seconds. The simplest Arduino combi..." | Read more » | over 7 years ago | |||
| cfastie | "I checked on the Mini Pearl logger in the compost pile today and swapped SD cards. It was still logging after 7.5 days, so that's a new record. I n..." | Read more » | over 7 years ago | |||
| cfastie | "The Public Lab spectrometers rely on cameras to make images of diffraction patterns. So the raw data is a photograph or video frame. Processing the..." | Read more » | over 7 years ago |