Ozone 2 Click

Featuring an accurate 22-bit ADC and a high-quality O₃ sensor protected by a stainless mesh, this Click board™ can be used in a range of applications used to measure or detect O₃ gas concentrations in the atmosphere, for small testing equipment development, various warning systems for air quality / ozone pollution, and other similar applications that are used for the ozone concentration detection and monitoring.

How does it work?

The main sensor component of the Ozone 2 click is the MQ131 ozone (O₃) gas sensor from Winsen Sensor, which uses the SnO2 (tin-oxide) alloy, which decreases its resistance while exposed to the O₃ gas. The greater the O₃ concentration is, the more conductive this material becomes. This can be utilized to obtain the O₃ concentration readings. The sensor itself contains a small heating element, connected to 5V power supply. It needs to be preheated for 48h before it can perform as specified. The sensitivity of the sensor is given as the ratio between the resistance in air and the resistance in the O₃ gas concentration of 50ppm, which is ≥ 3 (R_O/R_S ≥ 3). The sensor is protected against particles and mechanical damage by a stainless mesh, however, exposing to excessive moisture and corrosive gases can damage the inner structure.

Pinout diagram

This table shows how the pinout on Ozone 2 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Analog pin	AN	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
SPI Chip Select	CS	3	CS	TX	14	NC
SPI clock	SCK	4	SCK	RX	13	NC
SPI Data OUT	SDO	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power supply	+3.3V	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard Jumpers and Settings

Software Support

We provide a library for the Ozone 2 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

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 Ozone 2 Click driver.

Key functions

• Function reads from MCP 3351 ADC and returns 32 bit read value.

Example Description

This example reads data from the MCP 3351 sensor.

 void application_task ( void ) 
 { 
     read_value = ozone2_read( &ozone2 ); 
     log_printf( &logger, "Read Value: %urn", read_value); 

     Delay_ms ( 1000 ); 
     Delay_ms ( 1000 ); 
     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.Ozone2

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 MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK - MIKROE 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.

For more information about mikroSDK, visit the official page.