Conductivity Sensor Integration / MAVLink Problem

Blue Robotics Software
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Hi,

I hope all is well. I am working on a project where I am trying to integrate the Atlas Scientific Mini Conductivity K 1.0 Kit in my robot. I am using the EZO-EC chip with its carrier board. I switched the chip from UART mode to I2C mode and I connected the carrier board to the Navigator board through an I2C port.

I modified ArduSub to request data from the Atlas Scientific sensor and send it through MAVLink. To do this, I overrode the SCALED_PRESSURE2 message following what has been done to override the SCALED_PRESSURE3 message for the BlueRobotics Celsius temperature sensor.

The problem I am having now is that I have not been able to display the SCALED_PRESSURE2 message in any way. It is not available in QGroundControl or in the BlueRobotics front-end. I used a multiplexer to connect the Blue Robotics temperature sensor (BlueRobotics Temperature Sensor) and the depth sensor (BlueRobotics Pressure Sensor) as well. If I understood correctly:

  • SCALED_PRESSURE should be displaying the pressure of the barometer in the Navigator.
  • SCALED_PRESSURE3 should display the temperature readings.
  • VFR_HUD should display the depth (I am not completely sure about this).

So, overriding and using SCALED_PRESSURE2 should not be a problem. If this does not work, I could try as a workaround to create a new message.

Could someone please explain why I am not able to see SCALED_PRESSURE2 in the BlueRobotics front-end?

Thank you very much for your help.

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Hi @zonit -
Other folks may be able to provide feedback on your modification of ArduSub - however I have an alternative suggestion that may be much easier in general!

If you use the sensor in serial UART mode, you can receive the data on a Navigator serial port and @kurt_bluerobotics 's (in progress) guide on setting things up with node-red may be helpful. Once you have the data in nodered, it is possible to display in a Cockpit widget - we’ll have a guide published next week on how to make this final connection - stay tuned!

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Hi @zonit -
Here is the post announcing the new Node-RED guide!

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