Hello, i have a MS5837-30BA sensor, it is connected to my NodeMCU (ESP8266) with SDA,SCL, 3.3V and GND. I also have a seperate board with a BME280 pressure sensor, to get refference values.
The first question i have is, how is it ment to be if i want to measure the depth underwater? Because what i figured is, that if the (air)pressure changes (weather), the shown depth will change to even if the sensor has not been moved at all. So is there a way to measure the absolut depth (not changing with air-pressure changes)?
In the graph you have the following color coding:
blue = air pressure 1 (BME280)
black = air pressure 2 (different pressure sensor)
yellow = measured depth of the MS5837 in cm
red = difference of the air pressure 1 and the MS5837-pressure both in mbar, so the difference is equal to cm - depth
You can see that the red line is almost perfect, constant but there are some movements. The tiny changes are measure “inaccuracy” which is fine and about +/- 1cm, but at the beginning when i submerged it, there have been quite some changes with up to 5 cm difference.The depth in this entire graph is 18,5 cm
Hope to get some help from you