Pressure Sensor BAR30 "Depth Sensor Not Connected" (Navigator+RaspiberryPi4)

[Igor]

Hello,
alright?

I need some very urgent help now, I hope you can help me again.

I have the following configuration, Bar30 sensor, connected to the I2C port of the Navigator that is with Ardupilot, and RaspiberryPI4 with BlueOS.

The problem is the following, everything works perfectly, only the pressure sensor that does not recognize, says that there is none connected.

I already tested with 3 different navigators, 2 sensors… I tested some other firmware versions available and nothing.

[EliotBR (Eliot)]

Hi @Igor,

I suspect this is a parameter issue. Can you

1. make sure you’re using QGC 4.2.3
2. open the Parameters page
3. save your parameters to file (as a backup)
4. reset default parameters (which will hopefully solve your issue)

[VMartini (Vagner Martini)]

Hi @EliotBR ,

I was keeping up with @Igor today, and we noted the mavlink message SCALED_PRESSURE2 wasn’t showing up. He tried both reinstall QGC and reflash BlueOs with no success. He tested two different BAR30 in 3 different Navigators, and none of them have worked.
Tomorrow morning we’ll try to reset default parameters, and we let you know if it works.

[EliotBR (Eliot)]

Most likely the issue is one of the following:

@EliotBR

Can you confirm

1. the following parameters:

   Parameter	Value
   BARO_EXT_BUS	6
   BARO_PRIMARY	2ndBaro (1)

2. that the sensor is plugged in to one of the I²C 6 ports, rather than one of the ADC ports in the top row

but if it’s a parameter issue then there may also be problems with other parameters, which is why I suggested resetting all to defaults

Bar30 should definitely work with Navigator, and it would be very unusual for two sensors or three boards to be faulty in the same way.

[VMartini (Vagner Martini)]

Unfortunately it didn’t work. The BARO_EXT_BUS is showing as Unknown:6

[EliotBR (Eliot)]

@VMartini

The BARO_EXT_BUS is showing as Unknown:6

That should be fine.

Can you please confirm that

1. You’re using QGC 4.2.3
2. The sensor is plugged in to an I2C 6 port
   
   
3. The MS5611 (Bar30) sensor is detected as a barometer on the Summary page
   
4. The parameters are set as I specified above (you probably shouldn’t need to change them, but it wouldn’t hurt to try)
   
   

[VMartini (Vagner Martini)]

Hi,

This is how the sensor is plugged in (tried both):

And the sensor is not being detected:

And I set the parameters as specified.

We are going to a field job this weekend, and we’ll use the old setup with Pixhawk + old Bar30 version

I’ll try to test the sensors myself as soon as I get them.

[VMartini (Vagner Martini)]

Hi @EliotBR ,

I tried to run the Code Guide to Using the Bar30 with a Raspberry Pi directly on RPI4, but when i initialize the sensor I got:

>>> sensor.init()
PROM read error, CRC failed!
False

[EliotBR (Eliot)]

I expect that’s either from noisy communications (you may wish to try again, preferably making sure the cable is away from other electronics), or from a faulty/broken sensor. If that doesn’t help I’d recommend emailing support, in case they have more ideas, or they determine it’s best to replace the sensor.