Eggtimer Rocketry Flight Computer Instrukcja Użytkownika Pobierz pdf (Strona 23)

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 on the module chances are excellent

that it will be ruined.

__ Solder the TOP RIGHT pad of the Hope RF module to the board. Make sure that the

board is properly positioned after you solder this joint; it it moves, heat up the solder joint and

move the board slightly so that it is properly positioned. Wait 30 seconds after soldering

before continuing.

__ Stick a round toothpick in the hole in the middle of the solder pad marked ANT. This

is to prevent any solder from getting into the hole. Solder the BOTTOM LEFT pad of the

Hope RF module to the board, this is the one next to the ANT terminal. Wait 30 seconds,

then remove the toothpick.

__ Solder the remaining pads to the board, waiting 30 seconds between pads to prevent the

module from overheating. If you inserted resistor leads into the holes to line them up, be sure

to remove them before soldering.

Preliminary Testing

At this point of construction, your board will actually behave just like an Eggfinder TX board,

that is, it will stream NMEA GPS data continuously from the RF module. The difference is

that the frequency will be 915 MHz (ID = 0 if you have an LCD receiver), and there is no “on-

off” button; the data is always “on”.

__ Solder the battery connector that you’re going to be using for the computer power to the

two BATT terminals on the right side of the board. CHECK THE POLARITY: Normally, the

“+” lead is red, and the “-“ lead is black. If you’re not sure, connect a battery to the bare

pigtail, and check it with a DVM BEFORE you connect it to the board.

__ Connect the battery. The RED LED should immediately light. If it does not,

IMMEDIATELY disconnect the battery and check all the solder joints in and around the

voltage regulator, 10 uF capacitor, RED LED, and the 2.2.K resistor next to the LED.

__ After about one second you should see the little red LED on the RF module start

blinking, about once per second. This means that the GPS module is sending data to the RF

module. If it does not, IMMEDIATELY disconnect the battery and start troubleshooting.

__ If you have an Eggfinder LCD receiver, turn it on, set the frequency to 915, ID=0, reset

it, and it should start receiving data. If you’re outdoors you should start seeing a fix within a

minute or so: The amber light on the the Eggtimer TRS board should start flashing, and you

should see coordinates on the LCD display.

__ If you have an Eggtinder RX receiver on 915 MHz, connect it to your laptop, and start a

GPS monitoring application such as Visual GPS. You should see some satellites in view, and

hopefully you have enough signal to get a fix.

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Eggtimer Rocketry Flight Computer Instrukcja Użytkownika Strona 23