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Author Topic: Copernicus II (GPS), data reading problems!  (Read 855 times)
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Note: I posted a similar topic in "project guidance", but I realize that this is a section more relevant to my problems (I hope!)

Hi!  I have purchased a Trimble Copernicus II GPS unit and I am trying to read its data on the serial monitor with an Arduino Uno.  The unit came soldered onto a board with leads for 5v RS-232 and 3.3v TTL level outputs.  I have tried hooking up the TTL output lead to the Uno's RX pin, but the serial monitor did not output anything.  I tried using the SoftwareSerial library with pin 10 receiving, but it made no difference.  I used this code during my testing:

Code:
byte aa;
void setup()
{
  Serial.begin(4800);
  Serial.println("It works, so far");
}

void loop()
{
  if (Serial.available()>0) // if there is data coming into the serial line
  {
    aa = Serial.read(); // get the byte of data
    Serial.print(byte(aa)); // send it to the serial monitor
  }
}

I don't understand why nothing is being outputted.  The GPS unit warms up when I apply power, and I can see that it updates itself every second by reading the data leads with a voltmeter.  Can I please have some help with this?  Thank you!
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FIXED:

This is odd.  The device is rated for 5 - 14 volts, I applied around 12.75v via external battery pack, but nothing showed up on the serial monitor.  When I tried powering the device through the Arduino's 5v pin, voila, it works :p.  Does anyone know why this happened?
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I looked at the GPS data sheet and it is rated for 2.7-3.3V. My guess is that the regulator on your eval board did not like the higher voltage that you were applying.
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