Jonas Gartmann / Mbed OS EMPA_AutomationTraining_SCD41_Template

Template Software STM32F429 Discovery Kit with SCD41 CO2 Sensor

Dependencies:   LCD_DISCO_F429ZI TS_DISCO_F429ZI BSP_DISCO_F429ZI

scd41.h@13:aff8e9f42652, 2022-03-22 (annotated)

Committer:
garj
Date:
Tue Mar 22 10:19:59 2022 +0000
Revision:
13:aff8e9f42652
update to SCD41

Who changed what in which revision?

UserRevisionLine numberNew contents of line
garj 13:aff8e9f42652 1 #ifndef SCD41_H
garj 13:aff8e9f42652 2 #define SCD41_H
garj 13:aff8e9f42652 3
garj 13:aff8e9f42652 4 #include "mbed.h"
garj 13:aff8e9f42652 5 // i2c sensor address
garj 13:aff8e9f42652 6 #define SCD41_ADR 0x62
garj 13:aff8e9f42652 7 // sensor automatically starts measurement. RDY pin signals measurement ready.
garj 13:aff8e9f42652 8 #define COMMAND_CONTINUOUS_MEASUREMENT {0x21, 0xB1}
garj 13:aff8e9f42652 9 #define COMMAND_CONTINUOUS_MEASUREMENT_LEN 2
garj 13:aff8e9f42652 10 // command that needs to be sent before reading out the measurement result
garj 13:aff8e9f42652 11 #define COMMAND_READ_MEASUREMENT {0xec, 0x05}
garj 13:aff8e9f42652 12 #define COMMAND_READ_MEASUREMENT_LEN 2
garj 13:aff8e9f42652 13
garj 13:aff8e9f42652 14 /** Create Scd41 controller class
garj 13:aff8e9f42652 15 *
garj 13:aff8e9f42652 16 * @param Scd41 class
garj 13:aff8e9f42652 17 *
garj 13:aff8e9f42652 18 */
garj 13:aff8e9f42652 19 class Scd41 {
garj 13:aff8e9f42652 20
garj 13:aff8e9f42652 21 public:
garj 13:aff8e9f42652 22 enum ScdError {
garj 13:aff8e9f42652 23 SCD_ERROR_NO_ERROR,
garj 13:aff8e9f42652 24 SCD_ERROR_COM_ERROR
garj 13:aff8e9f42652 25 };
garj 13:aff8e9f42652 26
garj 13:aff8e9f42652 27 /** Create a Scd41 object using the specified I2C object
garj 13:aff8e9f42652 28 * @param sda - mbed I2C interface pin
garj 13:aff8e9f42652 29 * @param scl - mbed I2C interface pin
garj 13:aff8e9f42652 30 * @param I2C Frequency (in Hz)
garj 13:aff8e9f42652 31 *
garj 13:aff8e9f42652 32 * @return none
garj 13:aff8e9f42652 33 */
garj 13:aff8e9f42652 34 Scd41(PinName sda, PinName scl, int i2cFrequency, PinName rdy);
garj 13:aff8e9f42652 35
garj 13:aff8e9f42652 36 /** Initialize settings and start Auto-Measurement
garj 13:aff8e9f42652 37 *
garj 13:aff8e9f42652 38 * @param --none--
garj 13:aff8e9f42652 39 *
garj 13:aff8e9f42652 40 * @return enum ScdError
garj 13:aff8e9f42652 41 */
garj 13:aff8e9f42652 42 uint8_t init();
garj 13:aff8e9f42652 43
garj 13:aff8e9f42652 44 /** Check if measurement is ready
garj 13:aff8e9f42652 45 *
garj 13:aff8e9f42652 46 * @param --none--
garj 13:aff8e9f42652 47 *
garj 13:aff8e9f42652 48 * @return bool true=ready
garj 13:aff8e9f42652 49 */
garj 13:aff8e9f42652 50 bool isMeasurementReady();
garj 13:aff8e9f42652 51
garj 13:aff8e9f42652 52 /** Read all environmental parameters (CO2, Temp and Hum) from sensor
garj 13:aff8e9f42652 53 *
garj 13:aff8e9f42652 54 * @param --none-
garj 13:aff8e9f42652 55 *
garj 13:aff8e9f42652 56 * @return enum ScdError
garj 13:aff8e9f42652 57 */
garj 13:aff8e9f42652 58 uint8_t readMeasurement();
garj 13:aff8e9f42652 59
garj 13:aff8e9f42652 60 /** Get current temperature value
garj 13:aff8e9f42652 61 *
garj 13:aff8e9f42652 62 * @param --none--
garj 13:aff8e9f42652 63 *
garj 13:aff8e9f42652 64 * @return enum SCDerror
garj 13:aff8e9f42652 65 */
garj 13:aff8e9f42652 66 float getTemp(){ return _temp;};
garj 13:aff8e9f42652 67
garj 13:aff8e9f42652 68 /** Get current Humidity value
garj 13:aff8e9f42652 69 *
garj 13:aff8e9f42652 70 * @param --none--
garj 13:aff8e9f42652 71 *
garj 13:aff8e9f42652 72 * @return enum SCDerror
garj 13:aff8e9f42652 73 */
garj 13:aff8e9f42652 74 float getHumi(){ return _humi;};
garj 13:aff8e9f42652 75
garj 13:aff8e9f42652 76 /** Get current CO2 value
garj 13:aff8e9f42652 77 *
garj 13:aff8e9f42652 78 * @param --none--
garj 13:aff8e9f42652 79 *
garj 13:aff8e9f42652 80 * @return enum SCDerror
garj 13:aff8e9f42652 81 */
garj 13:aff8e9f42652 82 float getCo2(){ return _co2;};
garj 13:aff8e9f42652 83
garj 13:aff8e9f42652 84 private:
garj 13:aff8e9f42652 85 I2C _i2c;
garj 13:aff8e9f42652 86 DigitalIn _rdy;
garj 13:aff8e9f42652 87 float _temp;
garj 13:aff8e9f42652 88 float _humi;
garj 13:aff8e9f42652 89 float _co2;
garj 13:aff8e9f42652 90
garj 13:aff8e9f42652 91 };
garj 13:aff8e9f42652 92 #endif