Set auto-calibrate to false by default. Change example to enable cal.

sparkfun · Feb 26, 2021 · d820d0c · d820d0c
1 parent 42f08eb
commit d820d0c
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Showing 2 changed files with 22 additions and 15 deletions.
diff --git a/...leCalibrate/Example4_DisableCalibrate.ino → ...bleCalibrate/Example4_EnableCalibrate.ino b/...leCalibrate/Example4_DisableCalibrate.ino → ...bleCalibrate/Example4_EnableCalibrate.ino
@@ -9,7 +9,15 @@
   Feel like supporting open source hardware?
   Buy a board from SparkFun! https://www.sparkfun.com/products/15112
 
-  This example turns off the auto-calibrate function during .begin()
+  This example turns on the auto-calibrate function during .begin()
+  Please see section 1.3.6 of the SCD30 datasheet:
+
+  "When activated for the first time a
+    period of minimum 7 days is needed so that the algorithm can find its initial parameter set for ASC. The sensor has to be exposed
+    to fresh air for at least 1 hour every day. Also during that period, the sensor may not be disconnected from the power supply,
+    otherwise the procedure to find calibration parameters is aborted and has to be restarted from the beginning. The successfully
+    calculated parameters are stored in non-volatile memory of the SCD30 having the effect that after a restart the previously found
+    parameters for ASC are still present. "
 
   Hardware Connections:
   Attach RedBoard to computer using a USB cable.
@@ -29,7 +37,7 @@ void setup()
     Wire.begin();
 
     //Start sensor using the Wire port, but disable the auto-calibration
-    if (airSensor.begin(Wire, false) == false)
+    if (airSensor.begin(Wire, true) == false)
     {
         Serial.println("Air sensor not detected. Please check wiring. Freezing...");
         while (1)

diff --git a/src/SparkFun_SCD30_Arduino_Library.h b/src/SparkFun_SCD30_Arduino_Library.h
@@ -57,9 +57,10 @@
 #define COMMAND_STOP_MEAS 0x0104
 #define COMMAND_READ_FW_VER 0xD100
 
-typedef union {
-    byte array[4];
-    float value;
+typedef union
+{
+	byte array[4];
+	float value;
 } ByteToFl; // paulvha
 
 class SCD30
@@ -69,9 +70,9 @@ class SCD30
 
 	bool begin(bool autoCalibrate) { return begin(Wire, autoCalibrate); }
 #ifdef USE_TEENSY3_I2C_LIB
-	bool begin(i2c_t3 &wirePort = Wire, bool autoCalibrate=true, bool measBegin=true); //By default use Wire port
+	bool begin(i2c_t3 &wirePort = Wire, bool autoCalibrate = false, bool measBegin = true); //By default use Wire port
 #else
-	bool begin(TwoWire &wirePort = Wire, bool autoCalibrate=true, bool measBegin=true); //By default use Wire port
+	bool begin(TwoWire &wirePort = Wire, bool autoCalibrate = false, bool measBegin = true); //By default use Wire port
 #endif
 
 	void enableDebugging(Stream &debugPort = Serial); //Turn on debug printing. If user doesn't specify then Serial will be used.
@@ -82,11 +83,11 @@ class SCD30
 
 	// based on paulvha
 	bool getSettingValue(uint16_t registerAddress, uint16_t *val);
-	bool getForcedRecalibration(uint16_t *val) {return(getSettingValue(COMMAND_SET_FORCED_RECALIBRATION_FACTOR, val));}
-	bool getMeasurementInterval(uint16_t *val) {return(getSettingValue(COMMAND_SET_MEASUREMENT_INTERVAL, val));}
-	bool getTemperatureOffset(uint16_t *val) {return(getSettingValue(COMMAND_SET_TEMPERATURE_OFFSET, val));}
-	bool getAltitudeCompensation(uint16_t *val) {return(getSettingValue(COMMAND_SET_ALTITUDE_COMPENSATION, val));}
-	bool getFirmwareVersion(uint16_t *val) {return(getSettingValue(COMMAND_READ_FW_VER, val));}
+	bool getForcedRecalibration(uint16_t *val) { return (getSettingValue(COMMAND_SET_FORCED_RECALIBRATION_FACTOR, val)); }
+	bool getMeasurementInterval(uint16_t *val) { return (getSettingValue(COMMAND_SET_MEASUREMENT_INTERVAL, val)); }
+	bool getTemperatureOffset(uint16_t *val) { return (getSettingValue(COMMAND_SET_TEMPERATURE_OFFSET, val)); }
+	bool getAltitudeCompensation(uint16_t *val) { return (getSettingValue(COMMAND_SET_ALTITUDE_COMPENSATION, val)); }
+	bool getFirmwareVersion(uint16_t *val) { return (getSettingValue(COMMAND_READ_FW_VER, val)); }
 
 	uint16_t getCO2(void);
 	float getHumidity(void);
@@ -115,12 +116,11 @@ class SCD30
 	uint8_t computeCRC8(uint8_t data[], uint8_t len);
 
 private:
-
 	//Variables
 #ifdef USE_TEENSY3_I2C_LIB
 	i2c_t3 *_i2cPort; //The generic connection to user's chosen I2C hardware
 #else
-	TwoWire *_i2cPort; //The generic connection to user's chosen I2C hardware
+	TwoWire *_i2cPort;																		 //The generic connection to user's chosen I2C hardware
 #endif
 	//Global main datums
 	float co2 = 0;
@@ -136,6 +136,5 @@ class SCD30
 	//Debug
 	Stream *_debugPort;			 //The stream to send debug messages to if enabled. Usually Serial.
 	boolean _printDebug = false; //Flag to print debugging variables
-
 };
 #endif