Dears,
I got a problem with the Gms-U1lp GPS Receiver. As Horsa is in Holiday, maybe someone else have a Idea to try / help.
The main problem is, that the Receiver will hang up / take a time out during driving in my Car, but the Time is always beeing updatet.
I use it @10Hz with 115200 Baud.
For example: I have to Stop on a red Traffic Light. After the Car is standing still, the GPS-Speed will go down to zero (very slow, even if the Car is still standing for a few seconds, the showed Speed goes down from e.g. 30km/h.
If the traffic light get´s green and I go on, the Speed shows 0 km/h. Sometimes a few seconds, sometimes more than 1 minute.
I checked my Hardware and Software with an Fastrax UP501B, nothing else changed, and this works fine.
So I think it´s not related to my Programm or my Hardware Setup, as both Receivers use the MT3329 Chipset.
But the Fastrax Receiver is too big and I need the one-sentences output and Geofencing, so I want the Gms-U1lp Receiver to work good.
Connections:
The Receiver is connected regarding the Datasheet. The VPP ripple is at ~18mV.
For the Power I use an MP2357 switching regulator, even with a Linear regulator @3.3V the problem still exists.
The Receiver is soldered on a big Ground Plate, 86mm x 52mm, together with an SD Card Holder.
The Electronic is inside an ABS-Plastic Case. I test everything behind my Cars Frontwindow (NO Sunprotected Glass).
The Firmware is AXN-1.50
Does anyone have an Idea about that problem ?
Thanks.
BR,
Jens
