Basic principles observed and reported
Technology concept and/or application formulated
Analytical and experimental critical function and/or characteristic proof of concept
Component and/or breadboard validation in laboratory environment
Component and/or breadboard validation in relevant environment
System/subsystem model or prototype demonstration in a relevant environment
System prototype demonstration in an operational environment.
Actual system completed and qualified through test and demonstration.
Actual system proven through successful mission operations.
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Joule thief , voltage converter
IPhone to measure heart rate