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.
- 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
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)
| 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)
- Tested with Adafruit SCD40
- Tested with Adafruit SCD41
- Range of allowed values for ambient pressure compensation isn't verified (not available in datasheet), so it was copied from the SCD30