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Eggtimer Rocketry Proton - Page 12

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- 12 -
turned off and everything will be OK. If you battery only has a marginal current capability, the
same short may cause the Proton to reset if the voltage drops below the processor threshold
(about 2.8V). The deployment drivers are designed to shut down if the source voltage drops
below 4V, so that theoretically shouldn't happen, but it's better not to chance it. Depending on
when this happens, the effect could range from not getting your peak altitude reading (annoying),
to deploying only the drogue chute (if this happens when you fire the drogue), to a lawn stake if
you’re only using the drogue function and it fails to fire. Ouch. So, choose your battery wisely
if you're using a single battery.
If you’re using an ematch, you only need to set the deployment on-time to one second… if they
don’t fire in a few dozen milliseconds they probably won’t fire at all. If you’re using a hot-wire
(for example, to cut a cable tie or nylon fishing line) you’ll need to experiment with the on-time.
You’re going to want to do this on the ground, of course… flight-time is NOT for experimenting
with your deployment parameters!