Skip to content

Latest commit

 

History

History
103 lines (85 loc) · 3.48 KB

hdc1080_python_IIC.md

File metadata and controls

103 lines (85 loc) · 3.48 KB
Raw

hdc1080_IIC python3 module

Last modification: 11.07.2020

List of python files:

Chip description The HDC1080 is a digital humidity sensor with integrated temperature sensor that provides excellent measurement accuracy at very low power. The HDC1080 operates over a wide supply range,and is a low cost,low power alternative to competitive olutions in a wide range of common applications. Thehumidity and temperature sensors are factory calibrated.

hdc1080_constant.py

  • list of hdc1080 chip registers and their statuses

hdc1080.py

  • HDC1080 - main chip class
  • HDC1080.read_register - read status of one register
  • HDC1080.write_register - write new value to chip register
  • HDC1080.write_mert_invoke - touch (TEMP or HUMDT) register (used before reading TEMP or HUMDT value
  • HDC1080.both_measurement - read in one sequence TEMP and HUMDT register, CONF file will be pre-set for sequence reading, values are calculated to celsius degrees and humidity percentage
  • HDC1080.measure_temp - read only value of TEMP register
  • HDC1080.measure_hmdt - read only value of HUMDT register
  • HDC1080.sw_reset - software Reset CHIP
  • HDC1080.battery - check status of battery or power supply (must by > 2.4V)
  • HDC1080.serial - read SERIAL ID of CHIP
  • HDC1080.manufacturer - read MANUFACTURER ID
  • HDC1080.deviceid - read DEVICE ID

How to call python sub?

see hdc1080_i2c_test.py script

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 = hdc1080.HDC1080()

sw reset & battery test:

ret = sens.sw_reset()     # make sw reset of chip
ret = sens.battery()      # will check power_supply status, correct when voltage over than 2.4V

write to register:

ret = sens.write_register ( register = *reg_name*, bits = [*bit1*,*bit2* ...])
ret = sens.write_register ( register = *reg_name*, bits = [{*bit_name1* : *bit_value1*}, ... ]

example:

ret = sens.write_register( register = "CONF", bits = ['MODE_BOTH','HRES_RES3','TRES_RES1'])

read ID:

(val,ret) = sens.serial()
(val,ret) = sens.manufacturer()
(val,ret) = sens.deviceid()

read ID values (unique for each Texas Instruments HDC1080 chip

meausre:

(temp,hmdt, ret) = sens.both_measurement()
(temp, ret) = sens.measure_temp()
(hmdt, ret) = sens.measure_hmdt()

measure temperature or humidity sequentially or individually

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

output of test script:

pi@raspberrypi:~/ecomet_i2c_tools $ python3 hdc1080_i2c_test.py 
3.7.3 (default, Dec 20 2019, 18:57:59) 
[GCC 8.3.0]
ecomet.hdc1080: INFO     Start logging ...
ecomet.hdc1080: INFO     SW Reset correct
ecomet.hdc1080: INFO     Battery > 2.4V, correct
ecomet.hdc1080: INFO     Write CONF register correct
ecomet.hdc1080: INFO     SERIAL Read correct
ecomet.hdc1080: INFO     SER ID: 0127:1A13:DC00
ecomet.hdc1080: INFO     MANUFACTURER Read correct
ecomet.hdc1080: INFO     MAN ID: 5449
ecomet.hdc1080: INFO     DEVICE Read correct
ecomet.hdc1080: INFO     DEV ID: 1050
ecomet.hdc1080: INFO     Measured Temperate BOTH:      26.44 ℃
ecomet.hdc1080: INFO     Measured Humidity BOTH:      57.86 %
ecomet.hdc1080: INFO     Write CONF register correct
ecomet.hdc1080: INFO     Measured Temperate IND:      26.54 ℃
ecomet.hdc1080: INFO     Measured Humidity IND:      57.76 %

Note: for more details look into hdc1080_i2c_test.py