Diff: scd41.h

Revision:

13:aff8e9f42652

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scd41.h	Tue Mar 22 10:19:59 2022 +0000
@@ -0,0 +1,92 @@
+#ifndef SCD41_H
+#define SCD41_H
+
+#include "mbed.h"
+// i2c sensor address
+#define SCD41_ADR  0x62
+// sensor automatically starts measurement. RDY pin signals measurement ready.
+#define COMMAND_CONTINUOUS_MEASUREMENT {0x21, 0xB1}
+#define COMMAND_CONTINUOUS_MEASUREMENT_LEN 2
+// command that needs to be sent before reading out the measurement result
+#define COMMAND_READ_MEASUREMENT {0xec, 0x05}
+#define COMMAND_READ_MEASUREMENT_LEN 2
+
+    /** Create Scd41 controller class
+     *
+     * @param Scd41 class
+     *
+     */
+class Scd41 {
+ 
+public:
+     enum ScdError {
+         SCD_ERROR_NO_ERROR,
+         SCD_ERROR_COM_ERROR
+     };
+
+    /** Create a Scd41 object using the specified I2C object
+     * @param sda - mbed I2C interface pin
+     * @param scl - mbed I2C interface pin
+     * @param I2C Frequency (in Hz)
+     *
+     * @return none
+     */
+     Scd41(PinName sda, PinName scl, int i2cFrequency, PinName rdy);
+    
+    /** Initialize settings and start Auto-Measurement 
+     *
+     * @param --none--
+     *
+     * @return enum ScdError
+     */
+    uint8_t init();
+    
+    /** Check if measurement is ready
+     *
+     * @param --none--
+     *
+     * @return bool true=ready
+     */
+    bool isMeasurementReady();
+    
+    /** Read all environmental parameters (CO2, Temp and Hum) from sensor
+     *
+     * @param --none-
+     *
+     * @return enum ScdError
+     */
+    uint8_t readMeasurement();
+    
+    /** Get current temperature value
+     *
+     * @param --none--
+     *
+     * @return enum SCDerror
+     */
+    float getTemp(){ return _temp;};
+    
+    /** Get current Humidity value
+     *
+     * @param --none--
+     *
+     * @return enum SCDerror
+     */
+    float getHumi(){ return _humi;};
+    
+    /** Get current CO2 value
+     *
+     * @param --none--
+     *
+     * @return enum SCDerror
+     */
+    float getCo2(){ return _co2;};
+ 
+private:
+    I2C           _i2c;
+    DigitalIn     _rdy;
+    float         _temp;
+    float         _humi;
+    float         _co2;
+ 
+};    
+#endif
\ No newline at end of file