The latest in an ongoing series of build videos supporting Dr. Beddows enviro-sci students who all have to first build the logger(s) that get used for their final research project. These videos also support the other instructors who have adopted our DIY loggers for their own courses. These Falcon tube mini-loggers may well be as minimal as it is possible to go while still offering the flexibility of supporting multiple different sensors. About the only limitation is that the CR2032 levels out at 3.0v and runs all the way to 2.8v before shutdown - which rules out some older  sensors like the DS18b20 which has a lower limit of 3.3v. After calibration, the NTC has so much more resolution that it’s not much of an issue.

And for those with more build experience we also posted a 4minute 'rapid review' of the steps: