Lourdès Abou-tayeh / CCS811

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Dependents:   Capteur2

CCS811.h@1:d0abe05bc21e, 2021-09-06 (annotated)

Committer:
louatayehh
Date:
Mon Sep 06 11:32:22 2021 +0000
Revision:
1:d0abe05bc21e
Parent:
0:2c1dce3543ae 
Capteur 2 : CSS811;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
louatayehh 1:d0abe05bc21e 1 //*****************Capteur CCS811 - qualité de l'air ***************************//
louatayehh 1:d0abe05bc21e 2
louatayehh 0:2c1dce3543ae 3 #ifndef CCS811_H
louatayehh 0:2c1dce3543ae 4 #define CCS811_H
louatayehh 0:2c1dce3543ae 5
louatayehh 0:2c1dce3543ae 6 //CCS811 register define
louatayehh 1:d0abe05bc21e 7 #define CCS811_I2C_ADDR 0xB6 //Décalage adresse I2C de CCS811 (adresse 0x5B)
louatayehh 1:d0abe05bc21e 8 #define CCS811_REG_STATUS 0x00 //Status
louatayehh 0:2c1dce3543ae 9 #define CCS811_REG_MEAS_MODE 0x01 //Mesurement mode and conditions register.
louatayehh 0:2c1dce3543ae 10 #define CCS811_REG_ALG_RESULT_DATA 0x02 //Algorithm result. 2 bytes co2 ppm next 2 bytes ppb VOC level.
louatayehh 0:2c1dce3543ae 11 #define CCS811_REG_RAW_DATA 0x03 //Raw ADC data.
louatayehh 0:2c1dce3543ae 12 #define CCS811_REG_ENV_DATA 0x05 //Temperature and humidity data can be write to enavle compensation.
louatayehh 0:2c1dce3543ae 13 #define CCS811_REG_NTC 0x06 //Provides the voltage across the reference registor and the voltage across the NTC resistor.
louatayehh 0:2c1dce3543ae 14 #define CCS811_REG_THRESHOLDS 0x10 //Thresholds for operation when interrupts are only generated when eCO2 ppm crosses a threshold.
louatayehh 0:2c1dce3543ae 15 #define CCS811_REG_BASELINE 0x11 //The encoded current baseline value can be read.A previously saved encoded baseline can be written.
louatayehh 0:2c1dce3543ae 16 #define CCS811_REG_HW_ID 0x20 //Hardware ID. The value is 0x81.
louatayehh 0:2c1dce3543ae 17 #define CCS811_REG_HW_VERSION 0x21 //Hardware version. The value is 0x1X.
louatayehh 0:2c1dce3543ae 18 #define CCS811_REG_BOOT_VERSION 0x23 //Firmware boot version. The First 2 bytes contain the firmware version number for the boot code.
louatayehh 0:2c1dce3543ae 19 #define CCS811_REG_APP_VERSION 0x24 //Firmware application version. The first 2 bytes contain the firmware version number for the application code.
louatayehh 0:2c1dce3543ae 20 #define CCS811_REG_ERROR_ID 0xE0 //Error ID. When the status register reports and error its source is lcated in this register.
louatayehh 0:2c1dce3543ae 21 #define CCS811_REG_APP_START 0xF4 //Application start. Used to transition the CCS811 state from boot to application mode, a write with no data is required. Before performing a write to APP_START the Status register should be accessed to check if there is a valid application present.
louatayehh 0:2c1dce3543ae 22 #define CCS811_REG_SW_RESET 0xFF //If the correct 4 byres (0x11, 0xE5, 0x72, 0x8A)are written to this register in a single sequence the device will reset and return to BOOT bode.
louatayehh 0:2c1dce3543ae 23
louatayehh 0:2c1dce3543ae 24 //mode setting
louatayehh 0:2c1dce3543ae 25 #define CCS811_MEASUREMENT_MODE0 0x00 //Idle(Measurements are disabled in this mode).
louatayehh 0:2c1dce3543ae 26 #define CCS811_MEASUREMENT_MODE1 0x10 //Constant power mode, IAQ measurement every second.
louatayehh 0:2c1dce3543ae 27 #define CCS811_MEASUREMENT_MODE2 0x20 //Pulse heating mode IAQ measurement every 10 seconds.
louatayehh 0:2c1dce3543ae 28 #define CCS811_MEASUREMENT_MODE3 0x30 //Low power pulse heating mode IAQ measurement every 60 seconds.
louatayehh 0:2c1dce3543ae 29 #define CCS811_MEASUREMENT_MODE4 0x40 //Constant power mode, sensor measurement every 250ms. 1xx: Reserved modes (For future use).
louatayehh 0:2c1dce3543ae 30
louatayehh 0:2c1dce3543ae 31 //Interrupt control
louatayehh 0:2c1dce3543ae 32 #define CCS811_INT_DATARDY 0x08 //At the end of each measurement cycle (250ms, 1s, 10s, 60s) a flag is set in the STATUS register regardless of the setting of this bit.
louatayehh 0:2c1dce3543ae 33 #define CCS811_INT_THRESH 0x04 //0: Interrupt mode (if enabled) operates normally 1: Interrupt mode (if enabled) only asserts the nINT signal (driven low) if the new ALG_RESULT_DATA crosses one of the thresholds set in the THRESHOLDS register by more than the hysteresis value (also in the THRESHOLDS register).
louatayehh 0:2c1dce3543ae 34
louatayehh 0:2c1dce3543ae 35 #include "mbed.h"
louatayehh 0:2c1dce3543ae 36
louatayehh 0:2c1dce3543ae 37 class CCS811 {
louatayehh 0:2c1dce3543ae 38 public:
louatayehh 0:2c1dce3543ae 39 CCS811(PinName sda, PinName scl); // Créer une instance CCS811 connectée aux pin I2C sda et scl
louatayehh 0:2c1dce3543ae 40 void init(); // Initialisation capteur CCS811
louatayehh 0:2c1dce3543ae 41 int setMeasureMode(char mode);
louatayehh 0:2c1dce3543ae 42 int readData(uint16_t *ECO2, uint16_t *TVOC);
louatayehh 0:2c1dce3543ae 43 bool checkHW();
louatayehh 0:2c1dce3543ae 44 bool softRest();
louatayehh 0:2c1dce3543ae 45 bool readstatus();
louatayehh 0:2c1dce3543ae 46 bool readmeas();
louatayehh 0:2c1dce3543ae 47 bool readerror();
louatayehh 0:2c1dce3543ae 48 protected:
louatayehh 0:2c1dce3543ae 49 I2C _i2c;
louatayehh 0:2c1dce3543ae 50 };
louatayehh 0:2c1dce3543ae 51
louatayehh 0:2c1dce3543ae 52
louatayehh 0:2c1dce3543ae 53 #endif