Altitude and velocity values

Question

Altitude and velocity values

NathanNoumowe opened this issue 7 years ago · comments

Hello, I am trying to trigger a parachute with a naze32 Acro and for that I need to get the altitude and velocity values. So In the imu.c file I used printf to watch their values:

printf("Alt = %d ",(int)accAlt);
printf("VitZ = %d\n",( int)accZ_tmp);

But the altitude value isn't right at all. It's changing pretty slowly and the values are huge while it's suppose to be in centimeters. The velocity have pretty much same problems.
The values get also completly crazy when I turn the card upside down.
Is it normal? If it's not how can I fix this?

Thank you in advance for your answers.

NathanNoumowe commented 7 years ago

Anyone?

Michael Corcoran · Answer 1 · Thu Jul 13 2017 17:42:50 GMT+0800 (China Standard Time)

Uhhh, acro variant doesn't have baro right?

NathanNoumowe · Answer 2 · Thu Jul 13 2017 17:49:48 GMT+0800 (China Standard Time)

Yes it does have one.

dongie · Answer 3 · Sat Jul 22 2017 19:27:38 GMT+0800 (China Standard Time)

There's nothing to fix, look at msp code or telemetry, altitude value is there. What you need to do is zero it at takeoff (I believe there's a key combo). Then the numbers will be relative to ground.

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On Tue, Jul 18, 2017 at 4:59 PM, NathanNoumowe ***@***.***> wrote: Anybody? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#313 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEbO2FaD0oCU-55KfCKljIHy-eESYmKTks5sPGXHgaJpZM4OWuXe> .

NathanNoumowe · Answer 4 · Mon Jul 24 2017 15:49:16 GMT+0800 (China Standard Time)

Okay thanks I'm gonna try that. Otherwise I fixed the problem with the velocity when I turn the card upside down. Files that i have were already edited by someone before me and there was a delay in the main. When I took it off, values stopped getting bigger and bigger when I flip the card. But for now the altitude value is still wrong.

NathanNoumowe · Answer 5 · Mon Jul 24 2017 18:10:59 GMT+0800 (China Standard Time)

I found this at the line 130, in the file telemetry_hott.c :

// Altitude
HoTTV4GPSModule.altitudeLow = GPS_altitude & 0x00FF;
HoTTV4GPSModule.altitudeHigh = GPS_altitude >> 8;

I'm not sure if it contain altitude value but I can not display it.

dongie · Answer 6 · Mon Jul 24 2017 18:13:34 GMT+0800 (China Standard Time)

thats *GPS* altitude, you want the one from BARO, i already explained where it was. If you have no GPS then clearly there's not gonna be valid value in there.

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On Mon, Jul 24, 2017 at 7:11 PM, NathanNoumowe ***@***.***> wrote: I found this at the line 130, in the file telemetry_hott.c : // Altitude HoTTV4GPSModule.altitudeLow = GPS_altitude & 0x00FF; HoTTV4GPSModule.altitudeHigh = GPS_altitude >> 8; I'm not sure if it contain altitude value but I can not display it. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#313 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEbO2CY8fnGZ6kX-sIlrIL4xEuNmW5JJks5sRG21gaJpZM4OWuXe> .