Here is some exemple of a non pyro ejection system.
rocket crashed because the shock cord failed, but the opening system worked well. The electronics is in fact a small self made accelerometer with a build in timer and servo driver.
And here is another one (in french)
the electronics that control the servo is very basic: a timer controlling a relay that switch between two resistors linked to a standard servo driver. (note that this rocket also crashed. The door unlocked but did not open...)
one worked perfectly. The electronic is a servo driver and timer made from a single 4093. I even lauched a two stage version of the same rocket, with separation by a servo mechanism.
Schematic for a timer (for ejection charges)
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