C/C++ - CO2 Bricklet¶

Simple¶

Download (example_simple.c)

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#include <stdio.h>

#include "ip_connection.h"
#include "bricklet_co2.h"

#define HOST "localhost"
#define PORT 4223
#define UID "XYZ" // Change XYZ to the UID of your CO2 Bricklet

int main(void) {
    // Create IP connection
    IPConnection ipcon;
    ipcon_create(&ipcon);

    // Create device object
    CO2 co2;
    co2_create(&co2, UID, &ipcon);

    // Connect to brickd
    if(ipcon_connect(&ipcon, HOST, PORT) < 0) {
        fprintf(stderr, "Could not connect\n");
        return 1;
    }
    // Don't use device before ipcon is connected

    // Get current CO2 concentration
    uint16_t co2_concentration;
    if(co2_get_co2_concentration(&co2, &co2_concentration) < 0) {
        fprintf(stderr, "Could not get CO2 concentration, probably timeout\n");
        return 1;
    }

    printf("CO2 Concentration: %u ppm\n", co2_concentration);

    printf("Press key to exit\n");
    getchar();
    co2_destroy(&co2);
    ipcon_destroy(&ipcon); // Calls ipcon_disconnect internally
    return 0;
}

Callback¶

Download (example_callback.c)

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#include <stdio.h>

#include "ip_connection.h"
#include "bricklet_co2.h"

#define HOST "localhost"
#define PORT 4223
#define UID "XYZ" // Change XYZ to the UID of your CO2 Bricklet

// Callback function for CO2 concentration callback
void cb_co2_concentration(uint16_t co2_concentration, void *user_data) {
    (void)user_data; // avoid unused parameter warning

    printf("CO2 Concentration: %u ppm\n", co2_concentration);
}

int main(void) {
    // Create IP connection
    IPConnection ipcon;
    ipcon_create(&ipcon);

    // Create device object
    CO2 co2;
    co2_create(&co2, UID, &ipcon);

    // Connect to brickd
    if(ipcon_connect(&ipcon, HOST, PORT) < 0) {
        fprintf(stderr, "Could not connect\n");
        return 1;
    }
    // Don't use device before ipcon is connected

    // Register CO2 concentration callback to function cb_co2_concentration
    co2_register_callback(&co2,
                          CO2_CALLBACK_CO2_CONCENTRATION,
                          (void (*)(void))cb_co2_concentration,
                          NULL);

    // Set period for CO2 concentration callback to 1s (1000ms)
    // Note: The CO2 concentration callback is only called every second
    //       if the CO2 concentration has changed since the last call!
    co2_set_co2_concentration_callback_period(&co2, 1000);

    printf("Press key to exit\n");
    getchar();
    co2_destroy(&co2);
    ipcon_destroy(&ipcon); // Calls ipcon_disconnect internally
    return 0;
}

Threshold¶

Download (example_threshold.c)

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#include <stdio.h>

#include "ip_connection.h"
#include "bricklet_co2.h"

#define HOST "localhost"
#define PORT 4223
#define UID "XYZ" // Change XYZ to the UID of your CO2 Bricklet

// Callback function for CO2 concentration reached callback
void cb_co2_concentration_reached(uint16_t co2_concentration, void *user_data) {
    (void)user_data; // avoid unused parameter warning

    printf("CO2 Concentration: %u ppm\n", co2_concentration);
}

int main(void) {
    // Create IP connection
    IPConnection ipcon;
    ipcon_create(&ipcon);

    // Create device object
    CO2 co2;
    co2_create(&co2, UID, &ipcon);

    // Connect to brickd
    if(ipcon_connect(&ipcon, HOST, PORT) < 0) {
        fprintf(stderr, "Could not connect\n");
        return 1;
    }
    // Don't use device before ipcon is connected

    // Get threshold callbacks with a debounce time of 10 seconds (10000ms)
    co2_set_debounce_period(&co2, 10000);

    // Register CO2 concentration reached callback to function
    // cb_co2_concentration_reached
    co2_register_callback(&co2,
                          CO2_CALLBACK_CO2_CONCENTRATION_REACHED,
                          (void (*)(void))cb_co2_concentration_reached,
                          NULL);

    // Configure threshold for CO2 concentration "greater than 750 ppm"
    co2_set_co2_concentration_callback_threshold(&co2, '>', 750, 0);

    printf("Press key to exit\n");
    getchar();
    co2_destroy(&co2);
    ipcon_destroy(&ipcon); // Calls ipcon_disconnect internally
    return 0;
}

Basic Functions¶

void co2_create(CO2 *co2, const char *uid, IPConnection *ipcon)¶

Parameters:	co2 – Type: CO2 * uid – Type: const char * ipcon – Type: IPConnection *

Creates the device object co2 with the unique device ID uid and adds it to the IPConnection ipcon:

CO2 co2;
co2_create(&co2, "YOUR_DEVICE_UID", &ipcon);

This device object can be used after the IP connection has been connected.

void co2_destroy(CO2 *co2)¶

Parameters:	co2 – Type: CO2 *

Removes the device object co2 from its IPConnection and destroys it. The device object cannot be used anymore afterwards.

int co2_get_co2_concentration(CO2 *co2, uint16_t *ret_co2_concentration)¶

Parameters:	co2 – Type: CO2 *
Output Parameters:	ret_co2_concentration – Type: uint16_t, Unit: 1 ppm, Range: [0 to 10000]
Returns:	e_code – Type: int

Returns the measured CO2 concentration.

If you want to get the CO2 concentration periodically, it is recommended to use the CO2_CALLBACK_CO2_CONCENTRATION callback and set the period with co2_set_co2_concentration_callback_period().

Advanced Functions¶

int co2_get_identity(CO2 *co2, char ret_uid[8], char ret_connected_uid[8], char *ret_position, uint8_t ret_hardware_version[3], uint8_t ret_firmware_version[3], uint16_t *ret_device_identifier)¶

Parameters:	co2 – Type: CO2 *
Output Parameters:	ret_uid – Type: char[8] ret_connected_uid – Type: char[8] ret_position – Type: char, Range: ['a' to 'h', 'z'] ret_hardware_version – Type: uint8_t[3] 0: major – Type: uint8_t, Range: [0 to 255] 1: minor – Type: uint8_t, Range: [0 to 255] 2: revision – Type: uint8_t, Range: [0 to 255] ret_firmware_version – Type: uint8_t[3] 0: major – Type: uint8_t, Range: [0 to 255] 1: minor – Type: uint8_t, Range: [0 to 255] 2: revision – Type: uint8_t, Range: [0 to 255] ret_device_identifier – Type: uint16_t, Range: [0 to 216 - 1]
Returns:	e_code – Type: int

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions¶

void co2_register_callback(CO2 *co2, int16_t callback_id, void (*function)(void), void *user_data)¶

Parameters:	co2 – Type: CO2 * callback_id – Type: int16_t function – Type: void (*)(void) user_data – Type: void *

Registers the given function with the given callback_id. The user_data will be passed as the last parameter to the function.

The available callback IDs with corresponding function signatures are listed below.

int co2_set_co2_concentration_callback_period(CO2 *co2, uint32_t period)¶

Parameters:	co2 – Type: CO2 * period – Type: uint32_t, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0
Returns:	e_code – Type: int

Sets the period with which the CO2_CALLBACK_CO2_CONCENTRATION callback is triggered periodically. A value of 0 turns the callback off.

The CO2_CALLBACK_CO2_CONCENTRATION callback is only triggered if the CO2 concentration has changed since the last triggering.

int co2_get_co2_concentration_callback_period(CO2 *co2, uint32_t *ret_period)¶

Parameters:	co2 – Type: CO2 *
Output Parameters:	ret_period – Type: uint32_t, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0
Returns:	e_code – Type: int

Returns the period as set by co2_set_co2_concentration_callback_period().

int co2_set_co2_concentration_callback_threshold(CO2 *co2, char option, uint16_t min, uint16_t max)¶

Parameters:	co2 – Type: CO2 * option – Type: char, Range: See constants, Default: 'x' min – Type: uint16_t, Unit: 1 ppm, Range: [0 to 216 - 1], Default: 0 max – Type: uint16_t, Unit: 1 ppm, Range: [0 to 216 - 1], Default: 0
Returns:	e_code – Type: int

Sets the thresholds for the CO2_CALLBACK_CO2_CONCENTRATION_REACHED callback.

The following options are possible:

Option	Description
'x'	Callback is turned off
'o'	Callback is triggered when the CO2 concentration is outside the min and max values
'i'	Callback is triggered when the CO2 concentration is inside the min and max values
'<'	Callback is triggered when the CO2 concentration is smaller than the min value (max is ignored)
'>'	Callback is triggered when the CO2 concentration is greater than the min value (max is ignored)

The following constants are available for this function:

For option:

• CO2_THRESHOLD_OPTION_OFF = 'x'
• CO2_THRESHOLD_OPTION_OUTSIDE = 'o'
• CO2_THRESHOLD_OPTION_INSIDE = 'i'
• CO2_THRESHOLD_OPTION_SMALLER = '<'
• CO2_THRESHOLD_OPTION_GREATER = '>'

int co2_get_co2_concentration_callback_threshold(CO2 *co2, char *ret_option, uint16_t *ret_min, uint16_t *ret_max)¶

Parameters:	co2 – Type: CO2 *
Output Parameters:	ret_option – Type: char, Range: See constants, Default: 'x' ret_min – Type: uint16_t, Unit: 1 ppm, Range: [0 to 216 - 1], Default: 0 ret_max – Type: uint16_t, Unit: 1 ppm, Range: [0 to 216 - 1], Default: 0
Returns:	e_code – Type: int

Returns the threshold as set by co2_set_co2_concentration_callback_threshold().

The following constants are available for this function:

For ret_option:

• CO2_THRESHOLD_OPTION_OFF = 'x'
• CO2_THRESHOLD_OPTION_OUTSIDE = 'o'
• CO2_THRESHOLD_OPTION_INSIDE = 'i'
• CO2_THRESHOLD_OPTION_SMALLER = '<'
• CO2_THRESHOLD_OPTION_GREATER = '>'

int co2_set_debounce_period(CO2 *co2, uint32_t debounce)¶

Parameters:	co2 – Type: CO2 * debounce – Type: uint32_t, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100
Returns:	e_code – Type: int

Sets the period with which the threshold callbacks

• CO2_CALLBACK_CO2_CONCENTRATION_REACHED,

are triggered, if the thresholds

• co2_set_co2_concentration_callback_threshold(),

keep being reached.

int co2_get_debounce_period(CO2 *co2, uint32_t *ret_debounce)¶

Parameters:	co2 – Type: CO2 *
Output Parameters:	ret_debounce – Type: uint32_t, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100
Returns:	e_code – Type: int

Returns the debounce period as set by co2_set_debounce_period().

Callbacks¶

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the co2_register_callback() function:

void my_callback(int value, void *user_data) {
    printf("Value: %d\n", value);
}

co2_register_callback(&co2,
                      CO2_CALLBACK_EXAMPLE,
                      (void (*)(void))my_callback,
                      NULL);

The available constants with corresponding function signatures are described below.

CO2_CALLBACK_CO2_CONCENTRATION¶

void callback(uint16_t co2_concentration, void *user_data)

Callback Parameters:	co2_concentration – Type: uint16_t, Unit: 1 ppm, Range: [0 to 10000] user_data – Type: void *

This callback is triggered periodically with the period that is set by co2_set_co2_concentration_callback_period(). The parameter is the CO2 concentration of the sensor.

The CO2_CALLBACK_CO2_CONCENTRATION callback is only triggered if the CO2 concentration has changed since the last triggering.

CO2_CALLBACK_CO2_CONCENTRATION_REACHED¶

void callback(uint16_t co2_concentration, void *user_data)

Callback Parameters:	co2_concentration – Type: uint16_t, Unit: 1 ppm, Range: [0 to 10000] user_data – Type: void *

This callback is triggered when the threshold as set by co2_set_co2_concentration_callback_threshold() is reached. The parameter is the CO2 concentration.

If the threshold keeps being reached, the callback is triggered periodically with the period as set by co2_set_debounce_period().

Virtual Functions¶

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

int co2_get_api_version(CO2 *co2, uint8_t ret_api_version[3])¶

Parameters:	co2 – Type: CO2 *
Output Parameters:	ret_api_version – Type: uint8_t[3] 0: major – Type: uint8_t, Range: [0 to 255] 1: minor – Type: uint8_t, Range: [0 to 255] 2: revision – Type: uint8_t, Range: [0 to 255]
Returns:	e_code – Type: int

Returns the version of the API definition implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

int co2_get_response_expected(CO2 *co2, uint8_t function_id, bool *ret_response_expected)¶

Parameters:	co2 – Type: CO2 * function_id – Type: uint8_t, Range: See constants
Output Parameters:	ret_response_expected – Type: bool
Returns:	e_code – Type: int

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by co2_set_response_expected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

• CO2_FUNCTION_SET_CO2_CONCENTRATION_CALLBACK_PERIOD = 2
• CO2_FUNCTION_SET_CO2_CONCENTRATION_CALLBACK_THRESHOLD = 4
• CO2_FUNCTION_SET_DEBOUNCE_PERIOD = 6

int co2_set_response_expected(CO2 *co2, uint8_t function_id, bool response_expected)¶

Parameters:	co2 – Type: CO2 * function_id – Type: uint8_t, Range: See constants response_expected – Type: bool
Returns:	e_code – Type: int

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

• CO2_FUNCTION_SET_CO2_CONCENTRATION_CALLBACK_PERIOD = 2
• CO2_FUNCTION_SET_CO2_CONCENTRATION_CALLBACK_THRESHOLD = 4
• CO2_FUNCTION_SET_DEBOUNCE_PERIOD = 6

int co2_set_response_expected_all(CO2 *co2, bool response_expected)¶

Parameters:	co2 – Type: CO2 * response_expected – Type: bool
Returns:	e_code – Type: int

Changes the response expected flag for all setter and callback configuration functions of this device at once.

Constants¶

CO2_DEVICE_IDENTIFIER¶

This constant is used to identify a CO2 Bricklet.

The co2_get_identity() function and the IPCON_CALLBACK_ENUMERATE callback of the IP Connection have a device_identifier parameter to specify the Brick's or Bricklet's type.

CO2_DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a CO2 Bricklet.