Mikroelektronika d.o.o.
Air Quality 8 Click Board
Air Quality 8 Click Board
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Overview
The Air Quality 8 Click Board™ is a compact add-on board containing a best-in-class air-quality sensing solution. This board features the ZMOD4510, a fully calibrated digital sensor solution that detects air quality in various indoor and outdoor applications from Renesas. The ZMOD4510 comes with selective ozone measurement capabilities, offering visibility into the air quality in users' environments for a personalized experience. This Click board™ is an I2C configurable and characterized by outstanding long-term stability and lifetime.
Many additional features such as low power consumption, wide NO2 and O3 detection range, and high sensitivity make the Air Quality 8 Click Board™ an excellent choice for detecting unhealthy conditions in outdoor air, such as personal air-quality monitor, HVAC, and other various air quality-related applications.
How Does The Air Quality 8 Click Board™ Work?
The Air Quality 8 Click Board™ uses the ZMOD4510, a pre-calibrated digital sensor designed for reliable indoor and outdoor air quality detection from Renesas. This sensor comes with selective ozone measurement capabilities (NO2 and O3) and allows improved energy efficiency with less than 23mW of power consumption in continuous operation without compromising air quality. It also features electrical and gas calibration, proven MOx material, digital interface, siloxane resistance, and high-sensitivity and long-term stability allowing ppb detection limits. It covers extended operating humidity and temperature ranges from 5 to 90%RH and from -20°C to 50°C with ozone and nitrogen dioxide measurement ranges from 20 up to 500ppb.
The ZMOD4510 has a gas-sense element, consisting of a heater element on a silicon-based MEMS structure, a metal-oxide (MOx) chemiresistor, and a CMOS signal conditioning IC that controls the sensor temperature and measures the MOx resistance, which is a function of the gas concentration. It has two operational modes. The first mode of operation allows a general measurement of Air Quality, including the non-selective measurement of nitrogen dioxide (NO2) and ozone (O3). The second mode of operation allows the selective measurement of ozone (O3) featuring Ultra-Low Power with an average consumption of 0.2mW during its fast sample rate of 2 seconds.
It detects typical gases based on studies and international standards for outdoor air quality and uses a sequence of applied temperatures to sample the air and report an Air Quality Index (AQI). The sensor does not require an active or direct airflow onto the sensor module because diffusion of ambient gas does not limit the sensor response time. The ZMOD4510 can also detect safety-relevant gases; however, the sensor module is not designed to detect these interferants reliably. Therefore, it is not approved for use in any safety-critical or life-protecting applications.
The Air Quality 8 Click Board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting Standard Mode operation with a clock frequency of 100kHz and Fast Mode up to 400kHz. In addition, it also possesses other features such as reset pin routed to the RST pin on the mikroBUS™ socket, which with a low logic level puts the module into a Reset state, an additional interrupt signal, routed on the INT pin of the mikroBUS™ socket labeled as INT, indicating the status of measurement process itself.
The Air Quality 8 Click Board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | Air Quality ,Gas |
| Applications | The Air Quality 8 Click Board™ can be used for detecting unhealthy conditions in outdoor air, such as personal air-quality monitor, HVAC, and other various air quality-related applications |
| On-board modules | ZMOD4510 - pre-calibrated digital sensor designed for reliable indoor and outdoor air quality detection from Renesas |
| Key Features | Pre-calibrated, reliable for outdoor and indoor air quality detection, low power consumption, MOx material, digital I2C output, siloxane resistance, high-sensitivity, long term stability, and more |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V |
PINOUT DIAGRAM
This table shows how the pinout of the Air Quality 8 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| Reset | RST | 2 | RST | INT | 15 | INT | Interrupt |
| NC | 3 | CS | RX | 14 | NC | ||
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | SCL | I2C Clock | |
| NC | 6 | MOSI | SDA | 11 | SDA | I2C Data | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | NC | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
AIR QUALITY 8 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | - | 3.3 | - | V |
| Measurement Range | 20 | - | 500 | ppb |
| Humidity Range | 5 | - | 90 | &RH |
| Operating Temperature Range | -20 | +25 | +50 | °C |
Software Support
We provide a library for the Air Quality 8 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe Github account.
Library Description
This library contains API for the Air Quality 8 Click Board™ driver.
Key functions
-
airquality8_calc_oaqAir Quality 8 calculates AQI function. -
airquality8_read_rmoxAir Quality 8 calculate rmox resistance function. -
airquality8_start_measurementAir Quality 8 start measurement function.
Example Description
This library contains API for the Air Quality 8 Click Board™ driver. The library initializes and defines the I2C bus drivers to write and read data from registers. The library also includes a function for configuring sensor and measurement, read and calculate mox resistance ( RMOX ) and air quality index ( AQI ), etc.
void application_task ( void )
{
static uint8_t status_data;
static float rmox;
static float rmox_seq[ 15 ];
static float aqi;
status_flag = airquality8_start_measurement( &airquality8 );
airquality8_get_status( &airquality8, &status_data );
Delay_ms( 10 );
while ( ( status_data & AIRQUALITY8_STATUS_LAST_SEQ_STEP_MASK ) != AIRQUALITY8_OK )
{
airquality8_get_status( &airquality8, &status_data );
Delay_ms( 10 );
}
for ( uint8_t n_cnt = 0; n_cnt < 15; n_cnt++ )
{
status_flag = airquality8_read_rmox( &airquality8, &rmox, mox_lr, mox_er );
rmox_seq[ n_cnt ] = rmox;
Delay_ms( 100 );
if ( status_flag != AIRQUALITY8_OK )
{
display_error( );
}
}
aqi = airquality8_calc_oaq( rmox_seq, AIRQUALITY8_RCDA_STRATEGY_ADJ, AIRQUALITY8_GAS_DETECTION_STRATEGY_AUTO );
log_printf( &logger, " tAQI : %.3f rn", aqi );
log_printf( &logger, "---------------------------rn" );
Delay_ms( 1000 );
}
The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe Github account.
Other Mikroe Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.AirQuality8
Additional Notes and Information
Depending on the development board you are using, you may need a 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.
MIKROSDK
The Air Quality 8 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Software Support
We provide a library for the Air Quality 8 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe Github account.
Library Description
This library contains API for the Air Quality 8 Click Board™ driver.
Key functions
-
airquality8_calc_oaqAir Quality 8 calculates AQI function. -
airquality8_read_rmoxAir Quality 8 calculate rmox resistance function. -
airquality8_start_measurementAir Quality 8 start measurement function.
Example Description
This library contains API for the Air Quality 8 Click Board™ driver. The library initializes and defines the I2C bus drivers to write and read data from registers. The library also includes a function for configuring sensor and measurement, read and calculate mox resistance ( RMOX ) and air quality index ( AQI ), etc.
void application_task ( void )
{
static uint8_t status_data;
static float rmox;
static float rmox_seq[ 15 ];
static float aqi;
status_flag = airquality8_start_measurement( &airquality8 );
airquality8_get_status( &airquality8, &status_data );
Delay_ms( 10 );
while ( ( status_data & AIRQUALITY8_STATUS_LAST_SEQ_STEP_MASK ) != AIRQUALITY8_OK )
{
airquality8_get_status( &airquality8, &status_data );
Delay_ms( 10 );
}
for ( uint8_t n_cnt = 0; n_cnt < 15; n_cnt++ )
{
status_flag = airquality8_read_rmox( &airquality8, &rmox, mox_lr, mox_er );
rmox_seq[ n_cnt ] = rmox;
Delay_ms( 100 );
if ( status_flag != AIRQUALITY8_OK )
{
display_error( );
}
}
aqi = airquality8_calc_oaq( rmox_seq, AIRQUALITY8_RCDA_STRATEGY_ADJ, AIRQUALITY8_GAS_DETECTION_STRATEGY_AUTO );
log_printf( &logger, " tAQI : %.3f rn", aqi );
log_printf( &logger, "---------------------------rn" );
Delay_ms( 1000 );
}
The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe Github account.
Other Mikroe Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.AirQuality8
Additional Notes and Information
Depending on the development board you are using, you may need a 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.
MIKROSDK
The Air Quality 8 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Frequently Asked Questions
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