Expand description
The command words (Table 9), 16 bits each, most significant byte first, with no CRC after the command itself.
Constantsยง
- GET_
AUTOMATIC_ SELF_ CALIBRATION_ ENABLED - Read whether automatic self-calibration is enabled.
- GET_
DATA_ READY_ STATUS - Read the data ready word; see
super::data_ready. - GET_
SENSOR_ ALTITUDE - Read the sensor altitude, in metres above sea level.
- GET_
SERIAL_ NUMBER - Read the 48-bit serial number; see
super::serial_number. - GET_
TEMPERATURE_ OFFSET - Read the temperature offset word; see
super::temperature_offset_milli_celsius. - MEASURE_
SINGLE_ SHOT - Take one CO2, humidity, and temperature measurement (SCD41 only).
- MEASURE_
SINGLE_ SHOT_ RHT_ ONLY - Take one humidity and temperature measurement, CO2 reads 0 (SCD41 only).
- PERFORM_
FACTORY_ RESET - Reset the EEPROM configuration and erase the calibration history.
- PERFORM_
FORCED_ RECALIBRATION - Recalibrate against a reference CO2 concentration and fetch the correction.
- PERFORM_
SELF_ TEST - Run the end-of-line self-test; see
super::self_test_passed. - PERSIST_
SETTINGS - Store the current configuration in EEPROM.
- POWER_
DOWN - Put the sensor from idle into sleep (SCD41 only).
- READ_
MEASUREMENT - Read the CO2, temperature, and humidity words of the latest measurement.
- REINIT
- Reload user settings from EEPROM.
- SET_
AMBIENT_ PRESSURE - Write the ambient pressure word; see
super::ambient_pressure_word. - SET_
AUTOMATIC_ SELF_ CALIBRATION_ ENABLED - Enable (1) or disable (0) automatic self-calibration.
- SET_
SENSOR_ ALTITUDE - Write the sensor altitude, in metres above sea level.
- SET_
TEMPERATURE_ OFFSET - Write the temperature offset word; see
super::temperature_offset_word. - START_
LOW_ POWER_ PERIODIC_ MEASUREMENT - Start low power periodic measurement, one reading about every 30 seconds.
- START_
PERIODIC_ MEASUREMENT - Start periodic measurement, one reading every 5 seconds.
- STOP_
PERIODIC_ MEASUREMENT - Stop periodic measurement and return to idle.
- WAKE_UP
- Wake the sensor from sleep into idle; not acknowledged (SCD41 only).