Ohio Stormwater Conference 2010 report.

Ohio Stormwater Conference 2010 report.

Last week Lily and I took an Emriver Em2 to the Ohio Stormwater Conference.It was a great meeting. We met a lot of agency folks and regional stormwater workers who have outreach missions. Anybody doing outreach immediately sees how our models attract people and...

High school outreach is awesome.  And strangely oscilloscopic.

High school outreach is awesome. And strangely oscilloscopic.

We’ve been developing an electronic device that will drive the pump in our Em2 models, replacing mechanical valves and also giving precise flow data in digital form. The small DC pump motors are best controlled with pulse width modulation (PWM)–an...

Em2 redesign, your opinion please!

Em2 redesign, your opinion please!

We’re still working on design for legs/supports for the new Em2:  After what must be hundreds of hours of calculations, model building and testing, and meetings, I’ve walked in a circle and picked up my own tracks in the sand! I won’t go into the...

How open source happens: hard work.

How open source happens: hard work.

The top photo shows a little windmill at which I’ve been tilting. We’re working on what I hope will be (just like the 1969 version I once owned) the VW Beetle of stream tables.  A practical, dependable, scientifically robust, open source, and economical...

Awesome open-source Emriver instrumentation.

Awesome open-source Emriver instrumentation.

After quite a few weeks of work we managed today to hack thoughtfully meld a bunch of code and electronics to produce a device that can do three things: 1.  Control a 12-volt pump’s speed and flow output, and 2.  precisely measure that output in ml/second, 3. ...