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Calibrating The Accelerometer - Eggtimer Rocketry Proton User Manual

Board reva9; software rev. 1.01a

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Depending on what you have hooked up to the deployment channels and how it's powered, you
may see the deployment channel status displayed in different colors. The colors are:
◦ Silver – Status does not affect arming (channel turned off, for example)
◦ Aqua - Good deployment status, i.e. channel is enabled and you have continuity
◦ Red – No continuity on enabled channel, arming not possible
The Proton updates the deployment status every time that the page refreshes. If you leave the
page alone, it will refresh every 60 seconds. When it refreshes, you'll hear a little beep from the
speaker... this also lets you know that you've got power and are connected to your Proton. In
addition, every time the page refreshes a new validation code is created. You can force a page
refresh by hitting the refresh icon on your browser, or by clicking on the ARM button without
entering a validation code or entering an invalid validation code.

Calibrating the Accelerometer

You will notice that no matter which position you hold the Proton at after power-on, the Accel
number will be in RED. This is because the accelerometer has to "warm up" after power is
applied before the readings become stable; up until that point, the readings may drift from the
"actual" value. Once the accelerometer stabilizes, it can be used for flight, but first it needs to
be calibrated to compensate for whatever drift may have accumulated during the five minute
warm-up period. You CAN NOT arm the Proton for flight until the accelerometer has been
calibrated...
YOU NEED TO CALIBRATE THE ACCELEROMETER BEFORE EVERY FLIGHT
To calibrate the accelerometer, set the Proton horizontally; assuming that it's mounted in your
AV bay, just lay your AV bay on the table. Click on the "Calibrate" link next to the Accel
reading on the Status Page. If you do not see a "Calibrate" link, that means that the warm-up
period hasn't been reached yet... just be a little more patient. The warm-up period is five
minutes, so it shouldn't be long. Once you click on the Calibrate link, you'll see this screen:
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