# Overwrite pressure sensor data

**URL:** <https://discuss.bluerobotics.com/t/overwrite-pressure-sensor-data/13789>\
**Category:** Blue Robotics Software\
**Created:** [February 28, 2023, 5:42pm UTC](https://discuss.bluerobotics.com/t/overwrite-pressure-sensor-data/13789 "2023-02-28T17:42:13Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\
**Post date:** [March 2, 2023, 11:54am UTC](https://discuss.bluerobotics.com/t/overwrite-pressure-sensor-data/13789/2 "2023-03-02T11:54:50Z")

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Hi @vinsub,

> [@Ardusub 4.1.0 working with waterlinked uw gps?](https://discuss.bluerobotics.com/t/ardusub-4-1-0-working-with-waterlinked-uw-gps/13294/6):
>
> > [@Ardusub 4.1.0 working with waterlinked uw gps?](https://discuss.bluerobotics.com/t/ardusub-4-1-0-working-with-waterlinked-uw-gps/13294/5):
> >
> > Is there a way to simulate depth and temp without BAR30 connected to Pixhawk?
> 
> I don’t believe so, unless you simulate a Bar30 with a microcontroller or something that’s connected to the I2C port.
> 
> It may be possible to simulate depth by sending it via [`VISION_POSITION_ESTIMATE`](https://docs.bluerobotics.com/ardusub-zola/software/autopilot/ArduSub-4.1/developers/mavlink-messages/#incoming-messages:~:text=VISION_POSITION_ESTIMATE) MAVLink messages or something …

That said, if you only care about sending the values to QGC (e.g. for manual control), and not to the autopilot (e.g. for depth-hold mode and similar) then it may work to send [`SCALED_PRESSURE2`](https://mavlink.io/en/messages/common.html#SCALED_PRESSURE2) MAVLink messages (e.g. via a Python program) to the topside. That will only work if there’s not also an existing depth sensor (e.g. Bar30/Bar100) connected to the flight controller - otherwise the autopilot and your Python program will be fighting over which depth gets reported to QGC / QGC will be flickering between the different values.

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