airquality  2.0.0.0
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Air quality click

Air quality click carries an MQ-135 sensor for detecting poisonous gases that impact air quality in homes and offices. The click is designed to run on a 5V power supply. It communicates with the target microcontroller over the AN pin on the mikroBUS™ line.

click Product page


Click library

  • Author : Jelena Milosavljevic
  • Date : Jun 2021.
  • Type : ADC type

Software Support

We provide a library for the airquality Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for airquality Click driver.

Standard key functions :

Example key functions :

Example Description

The demo application shows the reading of the adc values given by the sensors.

The demo application is composed of two sections :

Application Init

Configuring clicks and log objects.

void application_init ( void ) {
log_cfg_t log_cfg;
airquality_cfg_t airquality_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
airquality_cfg_setup( &airquality_cfg );
AIRQUALITY_MAP_MIKROBUS( airquality_cfg, MIKROBUS_1 );
if ( airquality_init( &airquality, &airquality_cfg ) == ADC_ERROR ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
airquality_default_cfg ( &airquality );
log_info( &logger, " Application Task " );
}

Application Task

Reads the adc value and prints in two forms (DEC and HEX).

void application_task ( void ) {
uint16_t airquality_an_value = 0;
if ( airquality_read_an_pin_value ( &airquality, &airquality_an_value ) != ADC_ERROR ) {
log_printf( &logger, " ADC Value : %u\r\n", airquality_an_value );
}
float airquality_an_voltage = 0;
if ( airquality_read_an_pin_voltage ( &airquality, &airquality_an_voltage ) != ADC_ERROR ) {
log_printf( &logger, " AN Voltage : %.3f[V]\r\n\n", airquality_an_voltage );
}
Delay_ms( 1000 );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.Airquality

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.


airquality_init
err_t airquality_init(airquality_t *ctx, airquality_cfg_t *cfg)
Air quality initialization function.
airquality_cfg_setup
void airquality_cfg_setup(airquality_cfg_t *cfg)
Air quality configuration object setup function.
application_task
void application_task(void)
Definition: main.c:60
AIRQUALITY_MAP_MIKROBUS
#define AIRQUALITY_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: airquality.h:77
airquality_t
Air quality Click context object.
Definition: airquality.h:87
airquality_read_an_pin_voltage
err_t airquality_read_an_pin_voltage(airquality_t *ctx, float *data_out)
Air quality read AN pin voltage level function.
airquality_read_an_pin_value
err_t airquality_read_an_pin_value(airquality_t *ctx, uint16_t *data_out)
Air quality read AN pin value function.
airquality_cfg_t
Air quality Click configuration object.
Definition: airquality.h:97
application_init
void application_init(void)
Definition: main.c:30