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ms5637_IIC python3 module

Last modification: 20.05.2021

List of python files:

Chip description The MS5637 is an ultra-compact micro altimeter. It is optimized for altimeter and barometer applications. Thesensor module includes a high-linearity pressure sensor with internal factory-calibrated coefficients. Integrated digital pressure sensor (24 bit ΔΣ ADC). Operating range: 300 to 1200 mbar, -40 to +85 °C

ms5637_constant.py

  • list of MS5673 chip registers and their statuses

ms5637.py

  • MS5637 - main chip class
  • MS5637.read_register - read status of one register
  • MS5637.write_register - write new value to chip register
  • MS5637.sw_reset - software Reset CHIP
  • MS5637.measure - read in one shot temperature & pressure with deffined accuracy

How to call python sub?

see ms5637_i2c_test.py script located in python_test_scripts directory

set logging:

logging.basicConfig(level=logging.INFO

set for INFO level logging. possible used DEBUG, ERROR loogin script will produce log hdc1080.log

initialize chip:

sens = ms5637.MS5637()

sw reset & battery test:

ret = sens.sw_reset()     # make sw reset of chip !!necessary command before start CHIP connecting!!

write to register:

sens.write_register(register = <command>, stime = <variable>)

register parameter is name of command, stime is accuracy adviced for measurement calculation, see in table accuracy parameters

variable measurement accuracy accurcy OSR Min measure time in [ms] Resolution Pressure [mbar] Resolution Temp [C]
d1_time 1 256 0.54 0.11 0.012
d2_time 2 512 1.06 0.062 0.009
d3_time 3 1024 2.08 0.039 0.006
d4_time 4 2048 4.13 0.028 0.004
d5_time 5 4096 8.22 0.021 0.003
d6_time 6 8192 16.44 0.016 0.002

variable dX_time is defined in MS5637 class. also PROM calibration variable are defined in MS5637 class as (c1 - c6)

example:

sens.write_register(register = 'D2_CONV_256', stime = sens.d1_time)

read from register:

(val,ret) = sens.read_register(<register>)

read content of register from MS5637 chip, it is only 'ADC_READ' register used for reading measured Temperature and Pressure

example:

D2 = sens.read_register('ADC_READ')

meausre:

(temp_celsius,temp_fahrenheit,pressure, ret) = sens.measure (accuracy = <acc_number 1-6>)

measure temperature in celsius, fahrenheits and pressure in mbar

ret value: return value for each procedure (0 - correct, >0 - incorrect)

output of test script:

pi@raspberrypi:~/ecomet_i2c_raspberry_tools $ python3 ms5637_i2c_test.py
3.7.3 (default, Jan 22 2021, 20:04:44)
[GCC 8.3.0]
ecomet.ms5637: INFO     Start logging ...
ecomet.ms5637: INFO     SW Reset correct
ecomet.ms5637: INFO     Pressure =    1002.22 mbar
ecomet.ms5637: INFO     Temperature in Celsius =      24.00 ℃
ecomet.ms5637: INFO     Temperature in Fahrenheit =      75.19 F

Note: for more details look into ms5637_i2c_test.py