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Eggtimer Rocketry EZ-DD Flight Manual

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Eggtimer EZ-DD
Flight Manual
© 2024 Eggtimer Rocketry
All Rights Reserved
- 1 -

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Summary of Contents for Eggtimer Rocketry EZ-DD

  • Page 1 Eggtimer EZ-DD Flight Manual © 2024 Eggtimer Rocketry All Rights Reserved - 1 -...

  • Page 2: Limited Warranty

    If your Eggtimer EZ-DD does not work properly after assembly, take a deep breath, get out the magnifying glass and a good light, and see if you have inadvertently created a solder bridge somewhere.
  • Page 3 you have a problem with this, please contact us and we will be happy to send you a prepaid return label for your unbuilt kit and we will refund your purchase price. - 3 -...
  • Page 4 With the Eggtimer EZ-DD Rocket, you don’t need to worry about any of that… it’s all included in the kit, including a specially designed Eggtimer EZ-DD Altimeter that’s about a simple as you can get.
  • Page 5 Power Button – A push-on hold-off button for tuning your EZ-DD altimeter on and off. You press it briefly to power it on, and you hold it down for at least 5 seconds to turn it off.
  • Page 6 Practice arming and disarming your altimeter at home, so you know what it sounds like… in the case of the EZ-DD altimeter (and other Eggtimer altimeters, too) the “I’m Armed” sound is a rapid “chirping” that sounds nothing like the other sounds that other altimeters make.
  • Page 7 That’s it! Pretty easy,huh? Now that you know how to turn your EZ-DD on and off, we’re going to go through the things you need to do to fly your EZ-DD rocket, in detail. If you already have some experience with electronic deployments, you may want to skip down to the end where we have the “Quick Start”...
  • Page 8 See the motor manufacturer’s instructions for information on setting the motor delay, and removing the deployment charge powder if you are not going to be using it. For most Aerotech motors you will either pop off a retaining cap and dump the powder, or just leave it out of the motor’s charge well if the powder is packed separately.
  • Page 9 __ Connect the ematches, Insert your ematch into the charge well, and bend the lead down the outside. Wrap some masking tape around the charge well to hold it in. Feed the wires loosely around the center of the bulkplate, bend them so that they go past the terminal block, then trim the wires so that they are about 1”...
  • Page 10 Unscrew the terminal block screws so the metal “plate” on the screw has a gap, then feed one wire into the terminal block underneath the plate (NOT the screw). Bend the wire so it’s a “U”, then pull it through the terminal block. Tighten the screw, and trim any excess bare wire. - 10 -...
  • Page 11 When you first turn on the EZ-DD, you’ll get a 1-second beep to let you know that it’s working. After about 5 seconds, you’ll hear some additional beeps. That’s the current battery voltage, which is tested and reported to you when you power-up so you know if your battery is safe to fly.
  • Page 12 “chirping” rapidly. That is the “I’m ready” signal, and it will continue chirping until shortly after launch. Once you hear the chirping, you know that the EZ-DD is good to fly, so at this point you should TURN OFF the power by holding the button down for about 5 seconds until the chirping stops, finish prepping the rocket, (Don’t forget the powder in your charge wells! Don’t ask us how we...
  • Page 13 Repeat the procedure for the MAIN charge well. SAFETY NOTE: FROM THIS POINT ON, KEEP THE ROCKET POINTED AWAY FROM ANYBODY! __ Button up the rocket Add “dog barf” wadding to the bottom of the payload bay, we recommend adding about one body tube (3”...
  • Page 14 __ Put your rocket on the rail (Tilt it slightly away from the flight line!) __ Turn on the EZ-DD Altimeter, and wait for the “I’m Ready” chirping. IF YOU DO NOT GET THE CHIRPING (I.E. YOU GET REPEATING SHORT ONE-BEEP OR TWO-BEEP’S INSTEAD), DO NOT LAUNCH! Take it back to the table and check your ematch connections.
  • Page 15 __ Turn off the EZ-DD Altimeter The EZ-DD detects that your rocket is on the ground when there’s no change in altitude for over 5 seconds. Once on the ground, the EZ-DD will start beeping out the maximum altitude continuously for anyone within earshot to hear.

  • Page 16: Appendix A - Testing

    (such as the EZ-DD resetting in flight, or the igniter not firing because the battery can’t source enough current). In addition, you can test the output of the barometric sensor to confirm that the altitude readings are reasonable.
  • Page 17 (#36 or #40, for example). If you do, you may blow out the output transistors. We’ve designed the EZ-DD very conservatively, and the output drivers automatically provides current limiting to help protect the EZ-DD and your battery.

  • Page 18: Appendix B - Telemetry Using The Eggtimer Telemetry Module

    Connecting an Eggtimer Telemetry Module is simple… just plug its connector into the 3-pin header on the EZ-DD altimeter. Make sure that the black wire lines up with the pin marked “G” (for “Ground”). We recommend that you use a stubby helical antenna on the Eggtimer Telemetry Module rather than the included straight wire antenna, since the EZ-DD’s AV bay...

  • Page 19: Specifications

    3V3- 3.3V power output to Eggtimer Telemetry module (don’t connect anything else here!) TXD – Transmitted data (white wire on USB-Serial cable for testing) Telemetry Capability Real-time altitude, velocity, flight status, channel status, apogee, maximum velocity See the Eggtimer Rocketry web site for details on the Eggtimer Telemetry format - 19 -...
  • Page 20 __ Turn ON the EZ-DD altimeter and confirm continuity and battery voltage __ Turn OFF the EZ-DD altimeter… leave it off until you’re on the pad! __ Add powder to the charge wells, tape over the top (minimum 2 times, “X” pattern) FROM THIS POINT ON, KEEP THE ROCKET POINTED AWAY FROM ANYBODY! __ Button up the rocket…...
  • Page 21 Practice arming and disarming your altimeter at home, so you know what it sounds like… in the case of the EZ-DD altimeter (and other Eggtimer altimeters, too) the “I’m Armed” sound is a rapid “chirping” that sounds nothing like the other sounds that other altimeters make.

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