I re-calibrated the sensor using the Arduino IDE (I am more comfortable using that at the moment). I used the "sensor_tuning" code from the examples library (see below). This appeared to fix the CO2 calibration but it stopped any readings being recorded for Humidity. I am also not sure how the temperature offset works? It does not appear to be as simple as putting the sensor in a room at a specific temperature and calibrating at that same temperature.
Any help with the code I need to use to calibrate all three sensors on the SCD30 (CO2, Humidity and temperature) would be really appreciated.
Code: Select all
// Demo of the available settings for the SCD30
#include <Adafruit_SCD30.h>
Adafruit_SCD30 scd30;
void setup(void) {
Serial.begin(115200);
while (!Serial) delay(10); // will pause Zero, Leonardo, etc until serial console opens
Serial.println("Adafruit SCD30 Sensor adjustment test!");
// Try to initialize!
if (!scd30.begin(SCD30_I2CADDR_DEFAULT, &Wire1)) {
Serial.println("Failed to find SCD30 chip");
while (1) { delay(10); }
}
Serial.println("SCD30 Found!");
/***
* The code below will report the current settings for each of the
* settings that can be changed. To see how they work, uncomment the setting
* code above a status message and adjust the value
*
* **Note:** Since Automatic self calibration and forcing recalibration with
* a reference value overwrite each other, you should only set one or the other
***/
/*** Adjust the rate at which measurements are taken, from 2-1800 seconds */
// if (!scd30.setMeasurementInterval(5)) {
// Serial.println("Failed to set measurement interval");
// while(1){ delay(10);}
// }
Serial.print("Measurement interval: ");
Serial.print(scd30.getMeasurementInterval());
Serial.println(" seconds");
/*** Restart continuous measurement with a pressure offset from 700 to 1400 millibar.
* Giving no argument or setting the offset to 0 will disable offset correction
*/
// if (!scd30.startContinuousMeasurement(15)){
// Serial.println("Failed to set ambient pressure offset");
// while(1){ delay(10);}
// }
Serial.print("Ambient pressure offset: ");
Serial.print(scd30.getAmbientPressureOffset());
Serial.println(" mBar");
/*** Set an altitude offset in meters above sea level.
* Offset value stored in non-volatile memory of SCD30.
* Setting an altitude offset will override any pressure offset.
*/
// if (!scd30.setAltitudeOffset(110)){
// Serial.println("Failed to set altitude offset");
// while(1){ delay(10);}
// }
Serial.print("Altitude offset: ");
Serial.print(scd30.getAltitudeOffset());
Serial.println(" meters");
/*** Set a temperature offset in hundredths of a degree celcius.
* Offset value stored in non-volatile memory of SCD30.
*/
if (!scd30.setTemperatureOffset(1984)){ // 19.84 degrees celcius
Serial.println("Failed to set temperature offset");
while(1){ delay(10);}
}
Serial.print("Temperature offset: ");
Serial.print((float)scd30.getTemperatureOffset()/100.0);
Serial.println(" degrees C");
/*** Force the sensor to recalibrate with the given reference value
* from 400-2000 ppm. Writing a recalibration reference will overwrite
* any previous self calibration values.
* Reference value stored in non-volatile memory of SCD30.
*/
if (!scd30.forceRecalibrationWithReference(400)){
Serial.println("Failed to force recalibration with reference");
while(1) { delay(10); }
}
Serial.print("Forced Recalibration reference: ");
Serial.print(scd30.getForcedCalibrationReference());
Serial.println(" ppm");
/*** Enable or disable automatic self calibration (ASC).
* Parameter stored in non-volatile memory of SCD30.
* Enabling self calibration will override any previously set
* forced calibration value.
* ASC needs continuous operation with at least 1 hour
* 400ppm CO2 concentration daily.
*/
// if (!scd30.selfCalibrationEnabled(true)){
// Serial.println("Failed to enable or disable self calibration");
// while(1) { delay(10); }
// }
if (scd30.selfCalibrationEnabled()) {
Serial.print("Self calibration enabled");
} else {
Serial.print("Self calibration disabled");
}
Serial.println("\n\n");
}
void loop() {
if (scd30.dataReady()) {
if (!scd30.read()){
Serial.println("Error reading sensor data");
return;
}
Serial.print("Temperature: ");
Serial.print(scd30.temperature);
Serial.println(" degrees C");
Serial.print("Relative Humidity: ");
Serial.print(scd30.relative_humidity);
Serial.println(" %");
Serial.print("CO2: ");
Serial.print(scd30.CO2, 3);
Serial.println(" ppm");
Serial.println("");
}
delay(100);
}