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mikroSDK Library

Ozone 2 click

Rating:

10

Author: MikroElektronika Team

Last Updated: 2018-03-22

Category: Gas

Downloaded: 2805 times

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License: MIT license  

Ozone 2 click carries an MQ131 sensor for Ozone (O3). The sensor outputs an analog voltage, which is converted by the onboard MCP3551 22-bit ADC converter or it is sent to the microcontroller via AN pin on the mikroBUS™, depending on the position of ADC SEL. jumper. The click is designed to run on 5V power supply.

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mikroSDK Library Blog

Ozone 2 click

Ozone 2 click

Native view of the Ozone 2 click board.

View full image
Ozone 2 click

Ozone 2 click

Front and back view of the Ozone 2 click board.

View full image

Library Description

The library carries functions for initialization and reading the pa a digital value from MCP3351. Conversion of value to PPM is not covered by the library because it depends on the measurement environment.

Key functions

  • uint32_t ozone2_read() - Reads a digital value from MCP3351 ADC circuit

Examples Description

The application is composed of three sections :

  • System Initialization - GPIO and SPI module initialization
  • Application Initialization - SPI Driver initialization
  • Application Task - reading raw digital value from ADC each one second and displaying it via UART terminal
void applicationTask()
{
 readValue = ozone2_read();
 LongWordToStr(readValue,text);
 mikrobus_logWrite("Read Value: ",_LOG_TEXT);
 mikrobus_logWrite(text,_LOG_LINE);
 Delay_ms(1000);
}

Keep on mind that this is a raw measurement which should be converted to exact Ozone PPM value using formulas provided by circuit producer. Conversion to PPM depends on few conditions - more details 
can be found in the datasheet.

The full application code, and ready to use projects can be found on our 
LibStock page.

mikroE Libraries used in the example:

  • UART
  • SPI
  • Conversions

Additional notes and information

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

 

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