Eggtimer Rocketry Flight Computer Bedienungsanleitung PDF herunterladen (Seite 14)

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 with a new piece of masking tape.

__ DOUBLE-CHECK that the GPS module is properly oriented, and that the pads are

centered on the PC board’s pads. A jeweler’s loupe or small 10x magnifier is very handy for

this purpose.

__ Using as little solder as possible, solder ONLY the pad at the upper-right corner of the

GPS module. Use only enough solder to get the GPS pad mounted to the board, it won’t take

very much. You should hold the iron for about 5 seconds after the solder flows, then remove

the heat and wait at least 30 seconds before you touch anything. If you do this right, you

should see a nice shiny solder joint filling in the gap between the PC board and the GPS

module’s pad, with a slight radius as it transitions from the board up to the GPS module’s pad.

The solder should just fill in the half-moon on the side of the GPS module’s pad.

Refer to the picture of this step on the Eggtimer Rocketry web site for details,

http://www.eggtimerrocketry.com/page16.php?view=preview&category=7&image=92

__ CHECK AGAIN that the GPS module is properly oriented and that the pads are

centered on the PC board’s pads. Make sure that solder wicks up to the “half moon” in the

GPS pad. If the GPS module moved a little during soldering, heat up the solder joint and

GENTLY move it into place. If you cannot get it to move without removing it, remove the

masking tape, heat up the solder joint, then GENTLY lift the module from the board. Get a

new piece of masking tape, and try again.

__ Once you have successfully soldered the upper-right corner pad and confirmed that the

module is properly oriented on the board, repeat the procedure for the other three corners in

this order: Lower-Left Corner, Upper-Left Corner, Lower-Right Corner. Be sure to wait at

least 30 seconds between each solder joint to allow the module to cool down.

__ Remove the masking tape from the GPS module, and remove the masking tape holding

the board to your work surface. Turn the module over, and with two new pieces of masking

tape tack it down to your work surface so it will not move (yes, it will be upside-down).

You will now be soldering those eight square pads on the bottom of the GPS module to the PC

board. You will see that there are eight square pads with holes in the middle, these are aligned

with the square pads on the GPS module. What you are going to be doing is to flow solder

down those holes onto the pads, so that they are bonded to the board. Please read this

procedure carefully BEFORE you start soldering, it is important that you do not overheat the

pads on the GPS module.

__ Melt some solder onto the UPPER-LEFT PAD and hold the iron close to the hole,

melting the solder that you had previously flowed into the hole. Keep the iron there for about

10 seconds; if the solder gets sucked down into the hole (which is a good thing because that

means that it’s getting on the GPS pad below), add a little more. When you’re satisfied that the

solder has melted onto the GPS pad, remove the iron and let the board cool for at least 30

seconds.

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Eggtimer Rocketry Flight Computer Bedienungsanleitung Seite 14