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Nov 20, 2025
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Update SCD4x.md #1521

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3 changes: 2 additions & 1 deletion docs/SCD4x.md
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Expand Up @@ -63,14 +63,15 @@ and in MQTT topic (according to TelePeriod):
- Return data: -1 in case of error, "value" otherwise
- Exec(ms): time in ms needed for execution
- DPM: may be executed during periodic measurements
- Use SCD40Stop before changing settings. Use SCD40Pers and SCD40strt after changing settings.

| Command | Returns | Exec(ms) | DPM | Function |
|---|---|---|---|---|
| SCD40Alt | data | 1 | no | Get Sensor Altitude (in m)
| SCD40Alt x | errorvalue | 1 | no | Set Sensor Altitude in range 0-3000 (in m)
| SCD40Auto | data | 1 | no | Get CalibrationEnabled status (bool)
| SCD40Auto x | errorvalue | 1 | no | Set CalibrationEnabled status (bool)
| SCD40Toff | data | 1 | no | Set Temperature offset (centigrades)
| SCD40Toff | data | 1 | no | Set Temperature offset (centigrades) (higher value is lower reading, no negative value)
| SCD40Toff x | errorvalue | 1 | no | Set Temperature offset (centigrades) (some rounding may occur)
| SCD40Pres x | errorvalue | 1 | yes | Set Ambient Pressure in range 700-1200(mbar) (overrides Sensor Altitude setting)
| SCD40Cal x | errorvalue | 400 | no | Perform forced recalibration (ppm CO2)
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