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Parallax P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for the Sensirion SCD4x CO2 sensors

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avsa242/scd4x-spin

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scd4x-spin


This is a P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for the Sensirion SCD-4x CO2 sensors

IMPORTANT: This software is meant to be used with the spin-standard-library (P8X32A) or p2-spin-standard-library (P2X8C4M64P). Please install the applicable library first before attempting to use this code, otherwise you will be missing several files required to build the project.

Salient Features

  • SCD-40, SCD-41 supported
  • I2C connection at up to 100kHz
  • Read serial number
  • Read CO2 concentration, temperature, RH
  • Set compensation for local altitude above sea level, or ambient pressure
  • Automatic or manual CO2 calibration
  • Set temperature bias/offset
  • Continuous (SCD40, SCD41), continuous low-power (SCD40, SCD41) or single-shot (SCD41 only) measurement modes
  • Power down sensor (SCD41 only)
  • Save configuration settings to sensor EEPROM
  • Sensor built-in self-test

Requirements

P1/SPIN1:

  • spin-standard-library
  • 1 extra core/cog for the PASM I2C engine (none if the bytecode-based I2C engine is used)
  • sensor.temp.common.spinh (source: spin-standard-library)
  • sensor.rh.common.spinh (source: spin-standard-library)
  • sensor.co2.common.spinh (source: spin-standard-library)

P2/SPIN2:

  • p2-spin-standard-library
  • sensor.temp.common.spin2h (source: p2-spin-standard-library)
  • sensor.rh.common.spin2h (source: p2-spin-standard-library)
  • sensor.co2.common.spin2h (source: p2-spin-standard-library)

Compiler Compatibility

Processor Language Compiler Backend Status
P1 SPIN1 FlexSpin (6.9.4) Bytecode OK
P1 SPIN1 FlexSpin (6.9.4) Native/PASM OK
P2 SPIN2 FlexSpin (6.9.4) NuCode Untested
P2 SPIN2 FlexSpin (6.9.4) Native/PASM2 OK

(other versions or toolchains not listed are not supported, and may or may not work)

Hardware compatibility

  • Tested with Adafruit SCD40
  • Tested with Adafruit SCD41

Limitations

  • Range of allowed values for ambient pressure compensation isn't verified (not available in datasheet), so it was copied from the SCD30

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Parallax P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for the Sensirion SCD4x CO2 sensors

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