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BACKGROUND
What are all the quantities that can possibly be measured?
A good starting point was to determine which quantities can detected and/or measured using technology available to us today, regardless of cost, size, availability, etc.
One approach was to see what some of the most advanced and well-known machinery can sense. NASA's Mars rovers (newest one is Perseverance) would really be the perfect tricorders if only they could fit into our pockets and not cost billions of dollars
Which sensors are available commercially?
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Which sensors should I include?
Cost, weight, size, and power consumption are some of the factors that determine which of the commercially available sensors to include in the final device.
For example, I think it would be really neat to have a mass spectrometer as part of the device so I can study samples of soil .and rock However, the tiniest mass spectrometer is still too large, and the cheapest one is still too expensive.
The selection can be difficult when dealing with gas sensors..
Digital vs Analog Sensors
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