The systems identified so far are:
launch system,
package marking and identification,
support-frame,
balloon-envelope,
antenna,
envelope-frame tether,
solar panel,
energy storage / battery charging,
power consumption monitoring,
voltage regulation and power distribution,
real time clock,
ambient light sensing,
GPS position,
transmitter,
computer.
The functions and modes include:
pre-launch initialization,
launch,
current lat/lon,
current grid square,
day/night sensing,
UTC and local time,
battery charging cutoff,
battery charge level estimating,
transmitter inhibit depending on location,
transmit schedule determination based on time/location/remaining energy,
WSPR code generation,
synthesizer frequency