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Yep that's most likely the issue, the OSD's sent by Mark have bogus values for the amp sensor calibration (AmpereGain=1 and AmpereZero=6). Good defaults are AmpereGain=82 and AmpereZero=186 (190 for mine)!

Please report if it's the issue for you!

Edited by Kilrah
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please tell us your settings Current Zero and Current Gain ?

please email me a hires close up picture of your current sensor,

where I can see the board and wires and the connectors.

use: thomas at webx dot dk

oh France great, if you drive now, we can eat breakfast together ?

Edited by ThomasScherrer
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Thanks JMS :-)

but the OSD board is only the OSD, you need to supply it with +5V from somewhere.

And depending of use/needed functions/features you need extra:

current sensor, GPS, temperature sensor,

But you are right, I try to design small, it often end up light weight that way :-)

we could actually HALVE the size of the IFOSD board !!

but we would need 4 layer PCB design, and MLF type IC's = terrible to inspect visually and close to impossible to service,

and all the connectors and wired end up much bigger and much more weight there, so no need to I think.

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Thomas, you heatshrink the GPS units: no effect on reception?

(ref. the discussions in the Aerials forum, concluding heatshrinking 2.4GHz aerials is a bad idea)

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I could not see any degrade of my GPS units, due to the heatshrink,

I have tested several types of GPS modules, and even several online at the same time, all say the same sat count, with and without the heatshrink, so I dont worry if the degrade is ½ sat count :-) I still have 8-12 sats in my planes, when I have placed the GPS the right place far far away from noise sources.

I consider noise sources as a much bigger problem, In random order:

Speed controllers, Cameras, Switchmodes, motor wires, servo motors,

video transmitters, OSD units.

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now added G-Force sensor support, how to add such device easy and cheap.

If/when you have done this, please inform me, it is quite fun but will maybe animate a more crasy/unsafe flying style ? specially with the peak-hold, hehe,

try to brake your G-force record again and again.. when will the plane brake ?

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Thanks, Thomas - on a grey Monday morning, you've made me laugh (and laugh and laugh)... The G-Force World Championships, now that's a competition I'd like to attend (wearing a motorcycle helmet)...

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I am unable to send mail to the address: thomas[AT]webx.dot.dk

Here are the pictures of the current sensor.

BTW everyone, I'm all for the GForce record :D I'm thinking i can do a pretty good job on my stryker with full rates. Made my friend really quite pale after he took a flight with it on the HMD yesterday and was pulling light aerobatics haha.

I too use heatshrink on one of my GPS units, and none on the other. Performance for me is exactly the same.


Looks like the 10k resistor on the current sensor has fallen off. See there are two pads with a white line between them on your first picture, on the far right? If you put a 10k resistor on there (0603 SMT) or mail it to us you should be all good.

We're sorry for the screw ups with wrong resistors and such on this back of OSD's.. all future OSD's are getting manufactured by machine and having super high quality reflow so we don't have any issues with wrong values or components not sticking down as well as they should.

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On a side not, to keep track of issues.

If you have problems with firmware, config software or the website, please put in a bug report here:


Just click new at the top, complete the registration and then enter in as much detail as possible. This really helps us deal with problems as fast as possible!

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we did a real calibrated climatic chamber test today at work,

IFOSD and temperature sensor.

The cal values we used for our temperature sensor: Gain 35, Zero 203

Actual temperature, Measured Temperature, ADC value

-30C , -29C , 119

-0C , +1C , 206

+25C , +25C , 275

+75C , +77C , 423

+100C , +101C , 496

conclution : we should have tested 0C first so we could have known the right zero value from the start, it should have been 206 in our case, then we should have tested 100C to find the right gain.

but we know the gain 35 is right, our calibrated zero value 203 was in our case a bit too low, it should have been 206,

the zero value will vary from sensor to sensor and from OSD board, but gain will be constant.

so it is possible to ONLY change the zero at any know temperature, then all other temperatures will readout correctly.

Same rules apply to the F readout we just like C here.

Edited by ThomasScherrer
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video 7.8MB http://www.webx.dk/rc/video-wireless/stick...ck-speed213.mpg

check the sound !

every time I show up with my video planes I always draw alot of attention

and new ideas come to our mind.

I have added G force sensors, the pull G is maxed out and peak hold at 6.2G

and the plane forward G was measured to 3.3G max,

the sensor I used this time is a +/-5G sensor, it have a max of about 6G

I have ordered new sensors with 18G max.

Today I just wanted to see how fast the 2m stick could fly 213 km/hr

and I wanted to see if I could fly over the clouds, but I lost navigation

and had to abort the mission, and return to under the sky.

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