Compost Monitor: 2014 Model

Last year, I built a Compost Monitor to get real-time feedback on the temperature of my pile.  After an initial unsuccessful attempt to build a probe, I was able to get a probe design that lasted most of the season.  However, by the end of the year, when I pulled the probe from the pile, one of the sensors had gone bad, likely due to moisture.  Therefore, this year, I set out to build a more rugged probe. Continue reading

Measuring Supply Current Accurately

The current measurement mode in most multimeters is sufficient for many applications.  However, when measuring the supply current of loads that draw current infrequently in small bursts, it becomes difficult to measure the real, average current consumption accurately due to the slow sample rate of the multimeter.  Many wireless telemetry nodes present exactly such a situation and calculating expected battery life relies on an accurate measurement.  Fortunately, physics comes to our rescue (along with a few widgets to make things easier…).

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Data Acquisition Arduino Shields

After developing several products focused on data acquisition, like the MRBW-RTS and a few currently in development like the MRB-DCCM (DCC Meter) and MRBW-DAQ (Data Acquisition node), we realized some of the ICs used in those designs would be useful on their own.  To enable rapid development with these ICs, a series of ArduinoTM shields was created allowing you to easily implement a wide variety of data acquisition applications.

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MRBFS – A Filesystem for Reality (and MRBus)

Imagine that you could talk to the physical world as easily as you can read and write files on your computer. Imagine you could read a file, and read the temperature of an experiment on your bench or of your compost pile outside. Imagine you could simply write “on” to a file, and equipment across the room (or across the house) would power up instantly.  Imagine those ideas were just the start… If I’ve got your attention, MRBFS – the MRBus Filesystem – is what you’ve been waiting for.

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