Author: neilh

Comparison temperature dependency: LT500, Keller Nano Level

Testing equipment to measure water depth accurately in low flow applications in surface water streams.

Measuring low water in streams accurately

To recap from a previous blog, a project looking at effects of drought conditions is monitoring the low water depths in-stream, with transducers that have a capability of reliably measuring changes of ±0.01’(feet) in low water conditions, connected via an open interface 4-20mA  to an Onset U30 cellular wireless logger. For reliability,  it was decided to use two water transducers per logger. Over ...Read More

Accurate low stream depth measurements viewable on internet

Working on a remote river monitoring project with partners Cemar.org and a local chapter of The Nature Conservancy.

Wild wireless world ~ 2G or 3G

Wireless access comes in many forms – the cellular access is quite extraordinary in how useful it’s been – untethered access. There are hidden undercurrents for remote sensing M2M (machine-2-machine) – cellular technology shoals that can beach the unwary. I got beached – so I’m sharing it. Whether or not it’s on Sparkfun or publiclaboratories.org  low cost cellular modems are being discussed and p...Read More

IMP calling sensor

A fun project was using the Electric IMP001 to communicate with an RS485 pressure transducer. The readings are delivered to the cloud and use the nice (and evolving) services of thingspeak.net. The starting point was to test the stability of an RS485 pressure sensor – and check out the then new IMP001 – two projects in one. Stability testing a pressure transducer is putting it into a bottle of wat...Read More

What’s that sensor measuring?

Wow what a great place to share about sensors. My passion has been the interface between the real world and the digital domain. The world as we know it always has layers – so while we aim for a visualized story of some aspect of the real world – say temperature or stream depth– there are many aspects of collecting the data. Last year I bought a Honeywell Internet thermostat that allows me to see a...Read More