scd4x_i2c_example_usage.c

#include <stdio.h>
#include <time.h> // Add this line to include the time library

#include "scd4x_i2c.h"
#include "sensirion_common.h"
#include "sensirion_i2c_hal.h"

/**
 * TO USE CONSOLE OUTPUT (PRINTF) IF NOT PRESENT ON YOUR PLATFORM
 */
//#define printf(...)

int main(void) {
    int16_t error = 0;

    sensirion_i2c_hal_init();

    // Clean up potential SCD40 states
    scd4x_wake_up();
    scd4x_stop_periodic_measurement();
    scd4x_reinit();

    uint16_t serial_0;
    uint16_t serial_1;
    uint16_t serial_2;
    error = scd4x_get_serial_number(&serial_0, &serial_1, &serial_2);
    if (error) {
        printf("Error executing scd4x_get_serial_number(): %i\n", error);
    } else {
        printf("serial: 0x%04x%04x%04x\n", serial_0, serial_1, serial_2);
    }

    // Start Measurement

    error = scd4x_start_periodic_measurement();
    if (error) {
        printf("Error executing scd4x_start_periodic_measurement(): %i\n",
               error);
    }

    printf("Waiting for first measurement... (5 sec)\n");

    for (;;) {
        // Get the current timestamp
        time_t current_time;
        time(&current_time);

        // Convert the timestamp to a string
        char timestamp[20]; // Adjust the buffer size as needed
        strftime(timestamp, sizeof(timestamp), "%Y-%m-%d %H:%M:%S", localtime(&current_time));

        // Read Measurement if data is available
        bool data_ready_flag = false;
        sensirion_i2c_hal_sleep_usec(100000);
        error = scd4x_get_data_ready_flag(&data_ready_flag);
        if (error) {
            printf("Error executing scd4x_get_data_ready_flag(): %i\n", error);
            continue;
        }
        if (!data_ready_flag) {
            continue;
        }
        uint16_t co2;
        float temperature;
        float humidity;
        error = scd4x_read_measurement(&co2, &temperature, &humidity);
        if (error) {
            printf("Error executing scd4x_read_measurement(): %i\n", error);
        } else if (co2 == 0) {
            printf("Invalid sample detected, skipping.\n");
        } else {
            printf("Timestamp: %s\n", timestamp);
            printf("CO2: %u ppm\n", co2);
            printf("Temperature: %.2f °C\n", temperature);
            printf("Humidity: %.2f RH\n", humidity);

        }
    }

    return 0;
}