Eggtimer Rocketry Flight Computer Bedienungsanleitung

- 1 - Eggtimer Flight Computer User’s Manual Release 1.45 Board RevC © 2013 Eggtimer Rocketry All Rights Reserved

- 10 - Reset Switch (RST) When shorted, the Reset terminals put the Eggtimer “on hold”, i.e. resets it so that it does nothing. When it is in re

- 11 - Indicator Headers – .1”-spaced headers with outputs for the following external indicators: Ready LED – In parallel with the on-board Read

- 12 - (www.EggtimerRocketry.com) for details. Similarly you can also use the nice little sounders sold by Adept Rocketry, they make a very distinct

- 13 - 3) How much room you have for a battery – If you have a 3”, 4 pound I-powered rocket you probably have plenty of room for a 250 maH 3.6v NiM

- 14 - 2) Balance your model with the batteries in place. AAA and NiMH batteries are fairly heavy, as are some of the larger Lithium batteries su

- 15 - Before you try flying your Eggtimer, we recommend that you play around with the programming screens on your workbench, until you are comforta

- 16 - Note: When you first get your Eggtimer, the flight memory is NOT initialized. Please see Appendix A for instructions on how to clear the fl

- 17 - B Burn/Coast Samp/sec. <4,5,8,10,15,20,25<4,5,8,10,15,20,25<4,5,8,10,15,20,25<4,5,8,10,15,20,25,33,33,33,33>>>>

- 18 - will be 100 ms. You cannot change this setting, it is automatically populated when you change the Bur/Coast Sample rate. C Descent Sam

- 19 - 500 ms. You cannot change this setting, it is automatically populated when you change the Descent Sample rate. D Main Enable (0-Off, 1

- 2 - Eggtimer Features Altimeter rated to 29,500 ft ASL, resolution to approx 1 ft. Logs data for last 32 flights, “beeps” out maximum altitude o

- 20 - G CHB Enable (0-Off, 1-IGN, 2-Servo CCW, 3-Servo CW, 4-Airstart) H CHB On-Time <1-9, 0-Cont.> {only if CHB Enable =1 or 4} H

- 21 - since aerodynamic effects may compromise the accuracy of the pressure-derived altitude reading. Zeroes in these fields means that CHB didn’

- 22 - Also note that if you set the Airstart Delay too long (way too long...) and it expires AFTER Nose-Over is detected, the CHB channel will not

- 23 - Pre-Programmed Flight Profiles The Eggtimer has 8 pre-programmed flight profiles, in addition to the programming screen. These are designe

- 24 - Flying Your Eggtimer Once you’ve programmed your Eggtimer, you are ready for a flight. In general, a generic flight prep procedure for a m

- 25 - Take the rocket off the rod/rail, open up the payload bay, disconnect all batteries, and fix the failed condition. Then, you can start all o

- 26 - The beep codes are: Number of Beeps Problem 1 Battery Low ( < 2.8v) 2 Altimeter Sensor or Hardware Error 3 Breakwire open (airsta

- 27 - really high value (over 15°). If the pressure ports in your payload bay aren’t sized properly, this can introduce an error, particularly i

- 28 - broken shock cord or a zippered tube. It also means that you really don’t know that you’ve reached apogee until after you’ve been there bec

- 29 - Once you’ve noted the maximum altitude so you can brag about it to your friends, you should turn off the Eggtimer as follows: Turn ON the Re

- 3 - Disclaimers, Legal Stuff, Etc. The Eggtimer is meant to be used for hobby and experimental rocketry purposes. Although hobby rocketry has an

- 30 - Downloading Flight Data The Eggtimer records your last 32 flights into its flight memory, reporting three types of data: - Flight Setting

- 31 - After you hit the letter for the flight, you will be prompted to hit the button to start the download. At this point, you should go into you

- 32 - Altitude Nose-Over:1214 Time@ Nose-Over:8375 Altitude Main Trigger:298 Time@ Main Trigger: 75100 As you can see from this data, the rock

- 33 - You can clearly see that the rocket hits peak altitude at about 10 seconds, and maximum velocity at about 3 seconds. Note that the veloci

- 34 - Building Your Rocket to Use the Eggtimer Mounting In order to use your Eggtimer with a rocket, it will need to be properly mounted and se

- 35 - Two AAA batteries (or AAAA if you can find them) work very well, however the holders can be a problem because they are usually spring loaded

- 36 - 5) 12v “A23” batteries work well for firing low-current igniters (i.e. Quest Q2G2’s), but they don’t have a lot of capacity so they’re not go

- 37 - “-“ outputs of the deployment channel. If you leave out the resistor, the servo will not work, because the resistor pulls the control line d

- 38 - For example, a small 5” payload bay 1.5” inches in diameter (inside of a BT-60 coupler…) 1) Length of Payload Bay in inches: 5 2) Diam

- 39 - Appendix A – Special Functions There are some special functions that are accessed from the Flight Settings screen that are not on the menu

- 4 - Quick How-To Index How to Program Your Eggtimer….14 How to Use the Pre-Programmed Flight Settings…..23 How to Download Flight Info…..29 H

- 40 - Support staff to debug problems that you may encounter, but you can also use it to save all of the flight data prior to a Master Reset if you

- 41 - Appendix B – Deployment Channel Testing You can perform a pyro deployment test on your igniter channels using the Monitor mode. This allows

- 42 - Appendix C - Sample Flight Settings Low-to-Medium Power Non-Deployment Example These settings will work fine for a small D-size rocket, or

- 43 - Higher Power Multiple Deployment (Using motor’s ejection) This example is for a much higher powered rocket, using the motor’s ejection cha

- 44 - Water Rocket Servo Deployment Example These settings will work for a 2 litre or larger water rocket using a micro servo to trigger a parachu

- 45 - Appendix D - Setting Up Your Eggtimer for Airstarts Channel B can be used to fire airstart igniters, however with airstarts you have to

- 46 - It is STRONGLY recommended that you use a good quality switch for the deployment battery, and that you shunt the igniter until immediately pr

- 47 - bring that stage down, it should be timed to pop right around the first stage’s projected apogee. You may have to model the first stage’s fl

- 48 - Appendix E - Specifications Pressure Sensor: Type Bosch BMP-85/180, accuracy rated to approx. 9000 m (29,500 ft) Accuracy Approx 1m

- 5 - A General Introduction to Flight Computers A flight computer is used to record the flight path of a rocket, and to optionally deploy recove

- 6 - Generally, accelerometers are more accurate for events logged when the rocket is going up, and barometric pressure altimeters are more accura

- 7 - Programming is performed using a standard VT100/ANSI serial terminal program, connected to your computer with a USB-serial cable. Since ther

- 8 - wire or other igniters. The Eggtimer is capable of handling up to 30v, so you can ignite even an Aerotech Copperhead igniter with it, assumin

- 9 - External Switch/Indicator Options The Eggtimer has several connections for external switches and/or indicators. Power Switch (SW) An extern