451 replies to this topic

[Steph280]

ok I guess I screwed up. While trying to measure the voltage across GPS input pins, I accidentally shorted the pins for a fraction of a second. Now even with the EB85A GPS I am not getting anything. The little arrow on the "waiting for 05 satellites" screen doesn't rotate as it used to.

And my PC can no longer connect to it either.

Does this mean I fried something on the IFOSD? Is repair possible?

Edited by Steph280, 01 May 2009 - 03:17 PM.

[sigma_fr]

Hello,

Does the IF OSD can powered directely 5 VCC CAM and TX ?

On the connection diagram I see a 2 S 3 S batt + regulator (but I think It is when we have 12 Vcc TX or Cam)

Thanks

Julien  OSD_ConnectionDiagram.pdf   84.55KB   336 downloads

Edited by sigma_fr, 04 May 2009 - 06:20 AM.

[Kilrah]

On this diagram the OSD is powered by the flight battery throught the regulator that is fitted on the current sensor. The 2s/3s pack and regulator only power the camera and transmitter.

You can power the OSD with a 5V cam, but in this case you need to disconnect the supply coming from the current sensor (if it's the case on yours). The only important thing is that the OSD never receives a voltage above 5V.

[sigma_fr]

On this diagram the OSD is powered by the flight battery throught the regulator that is fitted on the current sensor. The 2s/3s pack and regulator only power the camera and transmitter.

You can power the OSD with a 5V cam, but in this case you need to disconnect the supply coming from the current sensor (if it's the case on yours). The only important thing is that the OSD never receives a voltage above 5V.

Sorry my question was not clear:

I would like to power the OSD, the CAM and the TX with the flight battery.

If The OSD is powered by the flight battery I hope that It can power the Tx and CAM (5V).

I just want to be sure

Julien

[Kilrah]

OK. Then no, it's not possible. The 5V regulator that is located on the current sensor couldn't supply enough current for the extra equipment without overheating.

[Steph280]

Thanks to Thomas, my OSD is fixed!

Does anybody have the init string for LS20033 GPS unit?

Thanks in advance.

[Kilrah]

$PMTK314,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28

$PMTK251,19200*22

$PMTK220,200*2C

[Steph280]

$PMTK314,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28
$PMTK251,19200*22
$PMTK220,200*2C

Strangely that's what I have in the OSD already. It still doesn't seem to work.

Guess I'll have to stick with the EB85.

Thanks for the strings.

[Kilrah]

Both are identical (they use the same chipset) so are directly interchangeable.
I'd suspect another issue, either wrong wiring or voltage. Where did you buy the LS20033? This is a 3.3V unit, so the voltage must be brought down a bit from the usual 5V. Some sellers include that directly in the GPS wiring, and it's also present in some IFOSD versions. You might have a wrong combination (both on board and GPS, which would give too low a voltage to the LS20033, or on none of them which could fry / have fried it if given 5V).

[Mr.RC-Cam]

Don't forget that the factory default baud rate on the LS20033 is different than the factory defaults on the EB-85A (FV-M8). Hint: Your initialization strings must be sent with a matching baud rate.

The voltage issue mention by Kilrah is very important too.

[Steph280]

Supposedly my IFOSD board is of later version that puts out 4 volts. I'll double check the wiring again and try different baud rates. Thanks for the helps.

[sigma_fr]

Hello,

Some one know if the IF OSD can worg with thuis GPS ?

GT 10Hz SMD GPS Module

http://www.nghobbies...products_id=497

Thanks

Julien