Eggtimer Rocketry Flight Computer Manual do Utilizador

Eggtimer TRS Flight Computer Assembly Manual Board Rev A5 © 2014 Eggtimer Rocketry All Rights Reserved

__ 11 10K ohm 0805 SMT resistors (marked “103”) __ 1 22K ohm 0805 SMT resistor (marked “223”) __ 4 .1 uF 0805 SMT multilayer ceramic capacito

Note that some of the components are static sensitive, so you should avoid sources of static electricity while you are handling them. We recommend

It is very important that you assemble the Eggtimer TRS in the order listed. This makes it easier to access the surface-mount components, if you star

It is CRITICALLY important that you get this part mounted properly, because once you solder it in it will be impossible to remove it. We’re not talk

top of the module so that it securely holds the GPS module in place. Gently tap the GPS module, it should not move; if it does, repeat the procedure

__ Repeat the procedure for the other pads, numbered 2-8, in this order (the one that you did before was pad #1). Wait 30 seconds between pads to al

Section 2 – The Deployment Side Next you will be soldering the SMT components that make up the deployment side of the board. They are to the right

__ Using only a tiny amount of solder, solder the other pad into place. You may want to use a very small piece of PAPER masking tape to hold the re

__ Mount the Deployment Transistors Locate the two large pads and two sets of three small pads for the deployment transistors, they are located just

“222”) from the tape and solder it in place. Inspect the solder joints with a 10x jeweler’s loupe to make sure you don’t have any solder briges. __

California Proposition 65 Warning WARNING: This product contains chemicals (lead) known to the State of California to cause cancer and birth defects

once the processor is installed, it is CRITICAL that you make SURE that they are installed correctly and that there are no solder bridges. __ Locat

__ Locate the spot for the CAT24C512 EEPROM, it’s a SOIC-8 package (8 pins with “J” leads) and is just to the left of the capacitor you just mounted

__ Locate the spot for the RED LED, it’s just above and to the left of the voltage regulator. Note that there is a “+” next to one pad. Insert the

since the SMT parts on the module are exposed. There are some VERY tiny exposed parts on the RF module, if you get the tiniest bit of errant solder o

When you are satisfied that the GPS and RF sections are working, unplug the battery… you can continue with the assembly. Mounting the Processor and

The standard Eggtimer TRS ¼ wave “stick” antenna is very simple and produces decent gain without being directional (i.e., the signal strength is pre

___ Put the bent end of the antenna into the hole on the top of the board marked ANT, but do not solder it in. Tape it down so that it points straig

Final Testing of Your Eggtimer TRS To test your Eggtimer TRS TX, first connect the battery. The PWR (RED) light should immediately light up. (If

Troubleshooting If your Eggtimer TRS doesn’t work after assembly and testing, take a deep breath, get out a beverage to clear you mind, and start tr

you will have to use a vacuum bulb or vacuum desoldering tool to unsolder it. We cannot stress enough that you need to check the orientation of the p

Important Regulatory Information This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this d

Troubleshooting Tips (in approximate order of likelihood) RED PWR LED doesn’t come on • Check the polarity of the LED… it may be in backwards • B

Installing a RP-SMA Connector for an External Antenna If you decide to install a RP-SMA connector for an external antenna on your Eggtimer TRS board

Hope RF HM-TRP Documentation (FCC test documentation) http://www.hoperf.com/upload/rf/HM-TRP-915(20dBm)-FCC.pdf FAA Regulations for Amateur Rocketr

The Eggfinder LCD handheld receiver will give you the coordinates and real-time altitude during your flight, and will also allow you to program the f

will ever need to buy. These solder stations usually have a little well with a tip-cleaning sponge, so they end up taking less room on your workstati

If you bought a Starter Set, you’re going to be assembling the Eggtimer TRS transmitter board first, because you’ll need the transmitter to be operat

Powering your Eggtimer TRS The Eggtimer TRS requires 4.5V-20V, with a nominal working current of about 70 mA. However, when first powering up it ma

least 360 2-second firing cycles; that assumes that the bridgewire on the match doesn’t burn through, so the reality is that it’s probably more like 1