EzOSD with Barometric Pressure Sensor

[grega]

EzOSD GPS does not work well on my multicopter. Signal is always lost during flight and altitude reading is +-50m (maybe I am doing something wrong). To get better altitude reading I have attached Barometric Pressure Sensor (BMP085) via Arduino to the ANA input of EzOSD current sensor. Arduino sends fake RSSI signal that represents altitude in meters instead of signal strength. So 13% on EzOSD means 13m. It works only from 0 to 100m, where 0 is power-on altitude.

Firmware feature request:
Dear ImmersionRC, could you please add a feature to increase RSSI resolution to 1/1000 : xxx.x instead of xxx? Or even better if EzOSD could receive custom text
Thank you.

Question:
Is it possible to communicate from Arduino with EzOSD via serial to correct GPS altitude based on barometric readings?

[Mictronics]

Since you have the Arduino already running why not parse the GPS NMEA strings and replace the GPS altitude in the strings with your baro altitude?

I'm doing the same on a similar project: http://fpvlab.com/forums/showthread....ter-Variometer

[ssassen]

Move the GPS receiver out on an arm with a clear view of the sky, or, when mounted in the center, place a 5x5cm aluminum plate under the GPS and connect that to GND, alternatively upgrade to a Locosys LS20031 GPS.

[grega]

Move the GPS receiver out on an arm with a clear view of the sky, or, when mounted in the center, place a 5x5cm aluminum plate under the GPS and connect that to GND, alternatively upgrade to a Locosys LS20031 GPS.

Thanks, I will try with aluminum plate. I already have the new model with 10Hz GPS.

[grega]

Since you have the Arduino already running why not parse the GPS NMEA strings and replace the GPS altitude in the strings with your baro altitude?

I'm doing the same on a similar project: http://fpvlab.com/forums/showthread....ter-Variometer

Nice project. I will try to intercept NMEA.
The best solution for me would be if DJI enables NMEA output from WooKong CAM BUS (IMU & GPS)

[killab]

What's involved with upgrading the GPS? Tutorial?

[reis]

Hi Grega,
Just wondering if you ever got your Barometric Sensor working well with the EZOSD? Sounds like an awesome project !!
Thanks,
Rick