Eggtimer Rocketry Flight Computer Uživatelský manuál stáhnout pdf (Strana 12)

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 start soldering out of order it’s going to

be tough for you to get to the pads of the SMT parts. Some of the instructions will call for you

to tack-tape parts to the board to maintain alignment while you solder, or to protect sensitive

areas from solder. You should ONLY use paper masking tape for that purpose, DO NOT use

“Scotch”® tape or electrical tape for this; plastic tapes can pick up static electricity and

damage parts, and electrical tape tends to leave a sticky residue.

Before you solder anything, make absolutely sure that you have the correct part and that it is

inserted in the board correctly. The board has all of the component values, outlines, and

polarities silk-screened on the top, so there shouldn’t be any doubt about what goes where and

how. Nevertheless, if you have any questions about the assembly procedure, do not hesitate to

drop us a line at support@eggtimerrocketry.com before you solder the parts to the board. You

may have to wait a day for the answer, but it could save you a lot of grief later on!

The Eggtimer TRS Limited Warranty does not cover damage to parts while attempting to

desolder them because you inserted something incorrectly. We spent a lot of time making

sure that the assembly instructions were clear, but once again if you have any questions about

the assembly procedures drop us a line at support@eggtimerrockety.com before you solder.

In general, you are going to be soldering components from the inside of the board outwards.

This makes it easier to reach those itty bitty SMT pads than if you did it by component type

and had to keep going back and forth across the board. Most importantly with the SMT parts,

and particularly the GPS module, INSPECT YOUR SOLDER JOINTS IMMEDIATELY

AFTER SOLDERING THEM. That’s why we recommend having a 10x jeweler’s loupe

handy… they work very well for making sure that you have nice shiny solder joints that cover

the pad and the component, and for checking to make sure that you don’t have solder bridges.

It’s MUCH easier to fix ONE component right after you mess it up than it is to go looking for

the “bad” part when the board doesn’t work after you first power it up, and is fully populated.

You will be mounting all of the SMT components first, then the through-hole parts except for

the processor, resonator, and buzzer. This will allow you to test it to make sure the GPS/RF

side is working before you install the processor; without those components, it will behave like

an Eggfinder TX transmitter. If you have an Eggfinder LCD receiver or an Eggfinder RX

receiver on 915 MHz (ID = 0), you should be able to get an NMEA GPS feed.

Once you know that the GPS/RF side is working, you’ll finish up the processor side, and you

should have a working Eggtimer TRS Flight Computer.

OK, with all that behind us, let’s get started…

Section 1 - Mounting the GPS Module

The very first thing you will be mounting is the Maestro Wireless A2235H GPS module. It’s a

square part about 5/8” square and ¼” deep, it is actually a small circuit board with an integral

patch antenna. There are very tiny parts mounted on the board, fortunately you don’t need to

worry about any of that, you’re just going to solder the GPS’ pads onto the Eggtimer TRS

board.

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Eggtimer Rocketry Flight Computer Uživatelský manuál Strana 12