Technical Notes - Jolly logic AltimeterOne User Manual

Technical Notes

We thought you might be interested to learn a little more about
the technical design of the Altimeter One. You can learn even
more by visiting www.jollylogic.com.
Logic
The "brain" of the altimeter is a microcontroller which is fast
enough to evaluate the local atmospheric pressure more than 20
times each second, while simultaneously updating the LCD display
64 times a second.
Sensors
The pressure and temperature sensing system is state of the art.
While overall system accuracy is a function of many factors
(sensor precision, analog to digital conversion, manufacturing
variation of individual chips, battery voltage run down, sample
rate, the weather), the Altimeter One—in its factory test mode—
can sense the pressure change of less than a foot and show how
high you are holding it to the nearest foot in real time. Amazing!
Power
The Lithium Polymer battery looks like a piece of aluminum foil
the size of a postage stamp folded in half twice. It weighs only 1.5
grams. Lithium batteries provide cutting edge performance, but
they also require very careful management to ensure safety and
long life. Two independent circuits ensure that the battery stays
cool and always operates within its design limits. The result: no
more batteries for you to worry about!
Plastic Case
The black outside case of the Altimeter One is a unique type of
ABS plastic chosen for its toughness as well as its translucence—
so that the charging LEDs can shine through it. Having a tough
protective case allows the Altimeter One to go where other
altimeters can't.
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