5 replies to this topic

[alex2wr]

Hello guys, I new to this forums and electronics, but I'm looking forward to learn. I just got a Netduino, a GPS shield and a EM-406A to make my first project and so far I'm figuring things out except that I cannot make the GPS to lock on satellites. In regards to my setup and what I've done: 1. Power through laptops USB port. 2. GPS module next to my window where my phone locks on 8 satellites 3. I have let the GPS on for over 12 minutes 4. The GPS is attached to GPS shield with 2-sided tape. Here's the GPS sentense I'm getting: $GPGGA,014445.417,,,,,0,00,,,M,0.0,M,,0000*54 $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPRMC,014445.417,V,,,,,,,171011,,,N*48 $GPGGA,014446.430,,,,,0,00,,,M,0.0,M,,0000*52 $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPGSV,1,1,00*79 $GPRMC,014446.430,V,,,,,,,171011,,,N*4E $GPGGA,014447.417,,,,,0,00,,,M,0.0,M,,0000*56 $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPRMC,014447.417,V,,,,,,,171011,,,N*4A $GPGGA,014448.417,,,,,0,00,,,M,0.0,M,,0000*59 $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPRMC,014448.417,V,,,,,,,171011,,,N*45 $GPGGA,014449.430,,,,,0,00,,,M,0.0,M,,0000*5D $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPRMC,014449.430,V,,,,,,,171011,,,N*41 $GPGGA,014450.417,,,,,0,00,,,M,0.0,M,,0000*50 $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPRMC,014450.417,V,,,,,,,171011,,,N*4C $GPGGA,014451.417,,,,,0,00,,,M,0.0,M,,0000*51 $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPGSV,1,1,00*79 Some of my questions: 1. Should I use UART or DLINE? 2. I don't understand what the "Solder Jumper" does, can someone tell me if I need to solder it? Your help is greatly appreciated, Alex,

[alex2wr]

I would also like to log a voltage in using the analog inputs, but I can't seem to make this work either. I connected a 1.5v AA battery positive to GPIO_PIN_A0 and negative to ground and get random numbers. I also connected the 3.3v supply pin to GPIO_PIN_A0 and get the number 1023 and I'm not sure what this is. Thanks, Alex,

[alex2wr]

I would also like to log a voltage in using the analog inputs, but I can't seem to make this work either.

I connected a 1.5v AA battery positive to GPIO_PIN_A0 and negative to ground and get random numbers. I also connected the 3.3v supply pin to GPIO_PIN_A0 and get the number 1023 and I'm not sure what this is.

Thanks,

Alex,

So I just read that 1023 is because the analog inputs are 10bit adc, 10^2 = 1024 - 1. So do I just interpolate? 0v = 0, 3.3v = 1023. If this is true, I just multiple the input value by 0.003.

Alex,

[Chris Seto]

Just about nothing you do on the GPS till have any effect on how it locks. You just need to make sure it's in an area with a clear view to the sky and it should pick up fix. A solder jumper is a pair or 2 pads that can be shorted together with a small drop of solder. These can sometimes be used for configuration settings and such.

[alex2wr]

Just about nothing you do on the GPS till have any effect on how it locks. You just need to make sure it's in an area with a clear view to the sky and it should pick up fix.

A solder jumper is a pair or 2 pads that can be shorted together with a small drop of solder. These can sometimes be used for configuration settings and such.

Hello Chris

Thank you for your feedback, I went ahead and tried to go out to an open area with and waited 45 minutes and still no lock.

Is it posible that the GPS is broken?

Alex,

[r1ch4rd]

Hi Alex,

 

Did you ever resolve the above? I am currently experiencing the same problem...

 

Many thanks,

Rich.