Ozone Click

PID: MIKROE-2355

Weight: 23 g

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Ozone Click is a compact add-on board that can add ozone detection and concentration monitoring to your application. This board features the MiCS-2614, a compact MOS sensor from SGX Sensortech. It is a robust MEMS sensor that works in harsh environments with a detection range from 10 to 1000 ppb. The Ozone sensors’ output is an analog voltage; thus, this Click board™ is equipped with the MCP3201, a 12-bit A/D converter with SPI serial interface from Microchip, for a more precise resolution. This Click board™ makes the perfect solution for developing 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 for ozone concentration detection and monitoring.

Ozone Click is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.

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How does it work?

Ozone Click is based on the MiCS-2614, a compact MOS sensor from SGX Sensortech. The MiCS-2614 comprises a micromachined diaphragm with an embedded heating resistor and a sensing layer on top. The sensor obtains the right temperature on the heater while using a single 5V power supply. With an onboard limiting resistor, the resulting voltage is typically 2.35V. This leads to a small amount of time needed for the sensor to get heated, so the correct values of the measurements can be obtained. The voltage measured on the load resistor is directly linked to the resistance of the sensor respectively. In other words, the sensor output is measured over the standard voltage divider configuration.

The MiCS-2614 sensor's output feeds the positive single analog pseudo-differential input of the MCP3201 analog-to-digital converter. This 12-bit ADC allows the host MCU to read more precise data from the sensor. The Ozone Click uses an SPI serial interface from the MCP3201 over the mikroBUS™ socket to communicate with the host MCU. The SPI modes 0,0, and 1,1 are supported with sampling rates of up to 100ksps at a clock rate of 1.6MHz.

This Click board™ can only be operated with a 5V logic voltage level. The board must perform appropriate logic voltage level conversion before using 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	Gas
Applications	Can be used for the development 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 ozone concentration detection and monitoring
On-board modules	MiCS-2614 - compact MOS sensor from SGX Sensortech
Key Features	Ozone concentration 10-1000ppb, heating element, 12-bit ADC for more precise readings, low power consumption, robust for harsh environments, 5 voltage operation, and more
Interface	SPI
ClickID	No
Compatibility	mikroBUS
Click board size	S (28.6 x 25.4 mm)
Input Voltage	5V
Category	Click Boards

Pinout diagram

This table shows how the pinout on Ozone Click 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
	NC	2	RST	INT	15	NC
SPI Chip Select	CS	3	CS	RX	14	NC
SPI Clock	SCK	4	SCK	TX	13	NC
SPI Data OUT	SDO	5	MISO	SCL	12	NC
SPI Data IN	SDI	6	MOSI	SDA	11	NC
	NC	7	3.3V	5V	10	5V	PowerSupply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Label	Name	Default	Description
LD1	PWR	-	Power LED Indicator

Ozone Click electrical specifications

Description	Min	Typ	Max	Unit
Receiver inputs voltage range	-	5	-	V
Measurement Range	10	-	1000	ppb

Resources

mikroBUS™

Downloads

Ozone click example on Libstock

Ozone click Schematic

MiCS-2614 datasheet

Type	Gas
Applications	Can be used for the development 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 ozone concentration detection and monitoring
On-board modules	MiCS-2614 - compact MOS sensor from SGX Sensortech
Key Features	Ozone concentration 10-1000ppb, heating element, 12-bit ADC for more precise readings, low power consumption, robust for harsh environments, 5 voltage operation, and more
Interface	SPI
ClickID	No
Compatibility	mikroBUS
Click board size	S (28.6 x 25.4 mm)
Input Voltage	5V
Category	Click Boards

Features and usage notes

The sensor outputs an analog voltage, which is converted by the onboard MCP3201 12-bit ADC converter. The MCP3201 is typically used as a sensor interface for data acquisition. It’s capable of outputting sample rates of up to 100 ksps at a clock rate of 1.6 MHz.

Note that the sensing layer is sensitive to various external factors. For example, it must not be exposed to high concentrations of organic solvents, silicone vapours or cigarette-smoke. Otherwise it might damage the sensitive layer and diminish the accuracy of the sensor.

Pinout diagram

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

Notes	Pin	mikroBUS^tm				Pin	Notes
Not connected	NC	1	AN	PWM	16	NC	Not connected
Not connected	NC	2	RST	INT	15	NC	Not connected
Chip select	SPI-CS	3	CS	TX	14	NC	Not connected
SPI Clock	SPI_SCK	4	SCK	RX	13	NC	Not connected
SPI Master Input Slave Output	SPI_MISO	5	MISO	SCL	12	NC	Not connected
Not connected	NC	6	MOSI	SDA	11	NC	Not connected
Not connected	NC	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Programming

The following code snippet reads off the sensor data every 500 milliseconds.

 1 void main() 
 2 {
 3    system_init();
 4    display_init();
 5    
 6    while( 1 )
 7    {
 8        measurement();
 9        calculation();
10        display_result();
11        delay_ms( 500 );
12    }
13 }

Code examples that demonstrate the usage of Ozone click with MikroElektronika hardware, written for mikroC for ARM, AVR, dsPIC, FT90x, PIC and PIC32 are available on Libstock.