Replies to This Discussion

Permalink Reply by Adam Kaplan on July 26, 2009 at 7:00am

Does the "digital" number readout in the lower half of the gauge actually read 200 or does the "analog" dial point to 200?

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Permalink Reply by Paul Har on July 26, 2009 at 7:28am

The Air speed indicator, dial indicator is full deflection and the centre digital readout read something like 230 mph

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Permalink Reply by Paul Har on July 26, 2009 at 7:50am

By sucking on the pitot tube the air speed goes to zero if that's any help

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Permalink Reply by Chris Anderson on July 26, 2009 at 7:55am

Do you have the silicon tube in the top nipple?

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Permalink Reply by Paul Har on July 26, 2009 at 9:31am

yes I do I am re reading th manaul again!! I had my first flight yesterday or should I say first fright
paul

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Permalink Reply by Gary Vaughan on July 26, 2009 at 1:33pm

here is a link (http://www.diydrones.com/profiles/blogs/unofficial-ardupilot-22). This contains some reference for the bias seting for the airspeed sensor in 2.2 but mine acts the same no matter what I put in for the bias value so you arent by yourself mine started when I went to the 2.2.3 code also.

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Permalink Reply by Paul Har on July 27, 2009 at 12:28am

thanks I have read the link. but still no solution I am hoping that someone will help out, note this 230 air speed indication is while it is on the bench. Not flying.
Paul

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Permalink Reply by Gary Vaughan on July 27, 2009 at 5:18pm

Mine was reading 237 until I went back to the 2.2.2 code and changed this in the sensors tab.


this is the changed version

air_speed_offset=analog3;//air_speed_bias_f;
}
/**/
int airSpeed(void)
{
//return constrain(Pressure_MTS((float)(analog3-air_speed_offset))-2,0,500); //COnverting to m/s = sqrt(((((5000mV/1023adc)*(analog3-air_speed_bias))/1 Volt/kP)*2)/1.225 Newtons/m*m)
return constrain(analog3-237,0,500);
}


this was original

air_speed_offset=analog3;//air_speed_bias_f;
}
/**/
int airSpeed(void)
{
//return constrain(Pressure_MTS((float)(analog3-air_speed_offset))-2,0,500); //COnverting to m/s = sqrt(((((5000mV/1023adc)*(analog3-air_speed_bias))/1 Volt/kP)*2)/1.225 Newtons/m*m)
return constrain(analog3-air_speed_offset,0,500);
}

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Permalink Reply by Jordi Muñoz on July 27, 2009 at 7:06pm

You are not calibrating the Sensor, for that you must insert the bind plug (set home).

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Permalink Reply by Chris Anderson on July 27, 2009 at 9:49pm

D'oh! I should have thought of that, too. Just a clarification: Jordi is referring to the field-calibration jumper/plug. See the manual for more info.

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Permalink Reply by Paul Har on July 28, 2009 at 8:06am

I will give it a go. I did not use the bind plug!

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