(Un)Common - HMT

Humidity • Moisture • Temperature
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Make Your Own Grain Bin Monitoring System

Now Supporting 24 Grain Types!

WHAT IS NEW IN VERSION 6.1?
The most important thing to know is that no new hardware is required!  If you have already built a version 5.x device, you already have all of the parts you need.

So, then what is new?
  • You will see a new color palette on the LCD.
    • We are hoping that you find the new colors to be easier to read in bright sunlight.
    • We also hope that you find them more pleasant to look at.
  • For all of you farmers moonlighting as technology geeks:
    • Version 6.1 is almost entirely a new code base.
    • All previous versions were built on Arduino.cc's IDE.  
    • Version 6.1 was built using Microsoft's Visual Studio.
      • This allowed us to more easily find areas where we could "clean up" and/or rewrite the code to make it more efficient.
      • We also hope that this new code base will help us find ways to quickly add features.  Hint, hint.
So, what is not new?
  • Sensors.  After a lot of research and soul searching, we decided to NOT change the sensors.
    • If you read online or talk to other developers, they will say that there are better options.  We disagree.  For this DIY device, we believe in the "one-wire" protocol.  It's super easy to work with, relatively cheap, and (assuming you follow the rules in our guides) just work.
  • "Equivalent Moisture" computations
    • In the original (previous to version 5.x) HMT versions, we used the Henderson and Chung-Pfost equations to calculate Equivalent Moisture.  
      • That proved unnecessary.
    • Starting with versions 5.x, we began using widely published tables to "look-up" (from internal memory) the grain's Moisture Content based on Temperature and Humidity.  All of these tables are also published in our guide's appendices.
(Un)Common - HMT Device
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