Intermediate
30 min

Say goodbye to air pollution with the help of WSP2110 and MK64FN1M0VDC12

Clear the air with action

Pollution Click with Clicker 2 for Kinetis

Published Aug 29, 2023

Click board™

Pollution Click

Dev Board

Clicker 2 for Kinetis

Compiler

NECTO Studio

MCU

MK64FN1M0VDC12

Protect your health and well-being by detecting harmful organic gases with our cutting-edge sensing technology

A

A

Hardware Overview

How does it work?

Pollution Click is based on the WSP2110, a VOC gas sensor from Winsen. The MQ-135 can detect the presence and concentration of toxic gases in the air, such as toluene, benzene, methanal, and alcohol. It consists of a heater and metal oxide semiconductor material on the ceramic substrate of subminiature Al2O3, which are fetched out by electrode down-lead and encapsulated in a metal socket and cap. Besides its high sensitivity, the WSP2110 is also characterized by a detection

range from 1 to 50 ppm for toluene, benzene, methanal, and alcohol. The WSP2110 provides an analog representation of polluted concentration in the air sent directly to an analog pin of the mikroBUS™ socket labeled OUT. The analog output voltage the sensor provides varies in proportion to the toxic gas concentration; the higher the toxic gas concentration in the air, the higher the output voltage. Also, this Click board™ has a built-in potentiometer that allows users to

adjust the load resistance of the MQ-135 circuit for optimum performance. The ENA pin can be used to enable the gas sensor. This Click board™ can be operated only with a 5V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Pollution Click top side image
Pollution Click bottom side image

Features overview

Development board

Clicker 2 for Kinetis is a compact starter development board that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It comes with an onboard 32-bit ARM Cortex-M4F microcontroller, the MK64FN1M0VDC12 from NXP Semiconductors, two mikroBUS™ sockets for Click board™ connectivity, a USB connector, LED indicators, buttons, a JTAG programmer connector, and two 26-pin headers for interfacing with external electronics. Its compact design with clear and easily recognizable silkscreen markings allows you to build gadgets with unique functionalities and

features quickly. Each part of the Clicker 2 for Kinetis development kit contains the components necessary for the most efficient operation of the same board. In addition to the possibility of choosing the Clicker 2 for Kinetis programming method, using a USB HID mikroBootloader or an external mikroProg connector for Kinetis programmer, the Clicker 2 board also includes a clean and regulated power supply module for the development kit. It provides two ways of board-powering; through the USB Micro-B cable, where onboard voltage regulators provide the appropriate voltage levels to each component on the board, or

using a Li-Polymer battery via an onboard battery connector. All communication methods that mikroBUS™ itself supports are on this board, including the well-established mikroBUS™ socket, reset button, and several user-configurable buttons and LED indicators. Clicker 2 for Kinetis is an integral part of the Mikroe ecosystem, allowing you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

Clicker 2 for Kinetis dimensions image

Microcontroller Overview

MCU Card / MCU

default

Architecture

ARM Cortex-M4

MCU Memory (KB)

1024

Silicon Vendor

NXP

Pin count

121

RAM (Bytes)

262144

Used MCU Pins

mikroBUS™ mapper

Analog Output
PB2
AN
Device Enable
PB11
RST
NC
NC
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
NC
NC
3.3V
Ground
GND
GND
NC
NC
PWM
NC
NC
INT
NC
NC
TX
NC
NC
RX
NC
NC
SCL
NC
NC
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Click board™ Schematic

Pollution Click Schematic schematic

Step by step

Project assembly

Clicker 2 for PIC32MZ front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Clicker 2 for Kinetis as your development board.

Clicker 2 for PIC32MZ front image hardware assembly
GNSS2 Click front image hardware assembly
Prog-cut hardware assembly
Micro B Connector Clicker 2 Access - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Flip&Click PIC32MZ MCU step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

This Click board can be interfaced and monitored in two ways:

  • Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.

Software Support

Library Description

This library contains API for Pollution Click driver.

Key functions:

  • pollution_generic_read - This function read ADC data

  • pollution_measure_load_voltage - This function gets load voltage from read ADC value

  • pollution_get_corrected_resistance - This function gets the corrected resistance of the sensor

Open Source

Code example

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

/*!
 * \file 
 * \brief Pollution Click example
 * 
 * # Description
 * Pollution click carries the VOC gas sensor and has high sensitivity to organic gases 
 * such as methanal (also known as formaldehyde), benzene, alcohol, toluene, etc.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Application Init performs Logger and Click initialization.
 * 
 * ## Application Task  
 * This is an example which demonstrates the usage of Pollution Click board.
 * Pollution Click reads ADC value, load voltage from ADC value, and reads corrected 
 * resistance of the sensor where results are being sent to the UART terminal 
 * where you can track changes.
 * 
 * \author Mihajlo Djordjevic
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "pollution.h"

float value_volt;
float value_res;

// ------------------------------------------------------------------ VARIABLES

static pollution_t pollution;
static log_t logger;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    pollution_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );
    Delay_ms ( 1000 );

    //  Click initialization.

    pollution_cfg_setup( &cfg );
    POLLUTION_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    pollution_init( &pollution, &cfg );
    
    log_printf( &logger, "-------------------------------------\r\n" );
    log_printf( &logger, "---------- Pollution Click ----------\r\n" );
    log_printf( &logger, "-------------------------------------\r\n" );
    Delay_ms ( 1000 );
    
    pollution_default_cfg( &pollution );
    Delay_ms ( 1000 );
    
    log_printf( &logger, "--------- ADC Initializated ---------\r\n" );
    log_printf( &logger, "-------------------------------------\r\n" );
    Delay_ms ( 1000 );
}

void application_task ( void )
{
    pollution_data_t tmp;
    
    tmp = pollution_generic_read( &pollution );
    log_printf( &logger, " ADC value            : %u ppm\r\n", tmp );
    Delay_ms ( 1000 );
    
    value_volt = pollution_measure_load_voltage( &pollution );
    log_printf( &logger, " Load voltage         : %.2f V\r\n", value_volt );
    Delay_ms ( 1000 );
    
    value_res = pollution_get_corrected_resistance( &pollution );
    log_printf( &logger, " Corrected resistance : %.2f kOhm\r\n", value_res );
    log_printf( &logger, "-------------------------------------\r\n" );
    Delay_ms ( 1000 );
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

// ------------------------------------------------------------------------ END
/*!
 * \file 
 * \brief Pollution Click example
 * 
 * # Description
 * Pollution click carries the VOC gas sensor and has high sensitivity to organic gases 
 * such as methanal (also known as formaldehyde), benzene, alcohol, toluene, etc.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Application Init performs Logger and Click initialization.
 * 
 * ## Application Task  
 * This is an example which demonstrates the usage of Pollution Click board.
 * Pollution Click reads ADC value, load voltage from ADC value, and reads corrected 
 * resistance of the sensor where results are being sent to the UART terminal 
 * where you can track changes.
 * 
 * \author Mihajlo Djordjevic
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "pollution.h"

float value_volt;
float value_res;

// ------------------------------------------------------------------ VARIABLES

static pollution_t pollution;
static log_t logger;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    pollution_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );
    Delay_ms ( 1000 );

    //  Click initialization.

    pollution_cfg_setup( &cfg );
    POLLUTION_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    pollution_init( &pollution, &cfg );
    
    log_printf( &logger, "-------------------------------------\r\n" );
    log_printf( &logger, "---------- Pollution Click ----------\r\n" );
    log_printf( &logger, "-------------------------------------\r\n" );
    Delay_ms ( 1000 );
    
    pollution_default_cfg( &pollution );
    Delay_ms ( 1000 );
    
    log_printf( &logger, "--------- ADC Initializated ---------\r\n" );
    log_printf( &logger, "-------------------------------------\r\n" );
    Delay_ms ( 1000 );
}

void application_task ( void )
{
    pollution_data_t tmp;
    
    tmp = pollution_generic_read( &pollution );
    log_printf( &logger, " ADC value            : %u ppm\r\n", tmp );
    Delay_ms ( 1000 );
    
    value_volt = pollution_measure_load_voltage( &pollution );
    log_printf( &logger, " Load voltage         : %.2f V\r\n", value_volt );
    Delay_ms ( 1000 );
    
    value_res = pollution_get_corrected_resistance( &pollution );
    log_printf( &logger, " Corrected resistance : %.2f kOhm\r\n", value_res );
    log_printf( &logger, "-------------------------------------\r\n" );
    Delay_ms ( 1000 );
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

// ------------------------------------------------------------------------ END

Additional Support

Resources

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