I am using an Arduino Nano to read the pressure data from 2 Bar02 sensors. They are connected via an I2C multiplexer TCA9548A and each sensor has an I2C level converter. I have both sensors out of the water and one seems to be working fine and showing a pressure of 1017 mbar. However, the other se…

It could maybe be incorrectly calibrated, or be faulty? The sensor datasheet doesn’t seem to specify a way to change the calibration, although it does allow you to read the calibration data, and provides a ‘Cyclic Redundancy Check’ (page 13) to verify that the stored calibration data is at least val…

Thanks for the valuable advice. When testing in a cup of water, the non working sensor does not change its values which probably means that the sensor is indeed faulty. I will also look into the CRC. While testing, I noticed what seems to be a tiny hole in the gel. I wonder if it is possible to refi…

[image] camilo: the non working sensor does not change its values which probably means that the sensor is indeed faulty Seems like a reasonable conclusion. [image] camilo: I wonder if it is possible to refill the gel. If so, is there a particular gel that would work? Unfortunately the…

Hello from the FUTURE! I see this post was written in 2021, so I hope there are some updates about your successes. What version of the Arduino Nano and blue robotics library were you using? I’m using a NANO 33 BLE and the arduino code says it is unable to compile for this arduino. Thank you!

The reason for posting here ist that I get a constant negative misreading of precisely 39 cm H2O on serial monitor and on Mission Planner quick tab after MS5837-BA02 calibration. I´m aware of the fact that this not the ArduPilot forum. I´m a new user here so I cant upload the arduino script for the …

Hi @U-Boat - The relative and absolute accuracy specifications of the Bar sensors can be a bit tricky. While the relative accuracy is quite good, the absolute can vary significantly as you’ve found. ArduSub handles this by assuming the pressure at start up is ambient atmospheric, and sets that to 0…

Happy to take a look! https://pastebin.com/ may be a way to share your sketch.

Hi Tony thanks for the valuable information on relative and absolute accuracy of the bar sensors. Would be great if you could take a look at the sketch : #include <Wire.h> #include "MS5837.h" MS5837 sensor; const int pwmPin = 9; // PWM output pin void setup() { Serial.begin(9600); Wire.begin(…

Thanks for the context @U-Boat - It seems you’re reading the sensor data with arduino, converting it to a different signal type, and then reading that with your flight controller? Ouch! I would guess that some level of error is being introduced by converting the signal from digital to “analog” and …

Bar02 negative pressure reading

Blue Robotics Products Sensors

U-Boat January 29, 2025, 6:31pm 8

Hi Tony - I tried what you describe - up to now I failed to implement this feature into the arduino scetch.Would you mind to take a look at the scetch once I can upload it - as said I m still a newbee without rights to upload files.

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