Hi, I have been setting up the APM+oilpan with MediaTek GPS with the public Beta. I am not geting a GPS lock signal displayed from the ABC led's. But it will get a GPS lock with lat. and long. displayed in the CLI when testing via USB in dump mode. Only geting a constant flash from the ABC led's in fly mode after IMU Calibration. Is there anything simple I have missed here?
Cheers Paul
Replies
delay(500);
_port->print(MTK_SET_BINARY);
delay(500);
_port->print(MTK_SET_BINARY);
delay(500);
_port->print(MTK_SET_BINARY);
delay(500);
_port->print(MTK_OUTPUT_4HZ);
and (you can call me crazy for it) it worked on the first attempt.
I measured the voltage between 1 and 8 pin on the MediaTek and I am getting 3.12v.
If I boot the board up and wait for the 3DFIX light on the MTek, I can then hit the reset button on the oilpan, let the it reboot and it will then show a GPS Lock. It seems to only not get the lock from an initial powerup.
Chris:
Thanks for doing that, I was not sure whether to do that or not, I will do so in future.
Cheers Paul
Measure the voltage between pins 1 & 8 on the MediaTek GPS. If it is less than 3.12 vdc then you are probably going to have problems getting a lock when on the UBEC.
You might try bending the little ears (tabs) on the back end of the negative plate of the battery holder under the interface board. Sometimes the ears get pushed into the positive plate of the battery holder and drop the regulator voltage below the allowable limit.
The regulator on my MediaTek was putting out 3.06 vdc and I was having trouble maintaining a reliable lock. After bending the ears away from the positive plate of the battery holder with my finger nail, I was able to always get a reliable lock. However, I sent the MediaTek GPS back to Jordi because 3.06 vdc is way out of spec and my other two MediaTek GPS/interface boards read 3.12 vdc or higher and always reliably lock.
Regards,
TCIII