MIKROE-2767

    Ozone 2 click PID: MIKROE-2767       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. It communicates with the target microcontroller over SPI interface or AN pin on the mikroBUS™ line. Note: The click carries TXB0106 Voltage Translator. For selecting the interface voltage level, use the onboard jumper, and choose between the 3.3V and 5V. For more information, see the Jumpers and Settings table below. MQ131 sensor features MQ131 is a semiconductor sensor for Ozone (O3). The gas sensing layer on the sensor unit is made of Tin dioxide, which has lower conductivity in clean air. The sensor’s conductivity is higher with the rising of the gas concentration. The sensor consists of micro Al2O3 ceramic tube, Tin dioxide sensitive layer, measuring electrode and heater fixed into stainless steel net. The heater provides necessary conditions for the proper functioning of the sensitive components. Calibrating the sensor To calibrate the sensor for the environment you’ll be using it in, Ozone 2 click has a small potentiometer that allows you to adjust the Load Resistance of the sensor circuit. For precise calibration, the sensor needs to preheat (once powered up, it takes 48h to reach the right temperature). Specifications Type  Gas  Applications  It can be used in different Ozone concentration detectors for air quality control, or for  gas leak detection.  On‐board  modules  MQ131 sensor, MCP3551   Key Features  Ozone concentration 10‐1000 ppm, communicates over the AN pin or ADC MCP3551,  sensitivity Rs(in air)/Rs(in 50 ppm O3)≥3, onboard potentiometer for calibration  Interface  SPI  Input Voltage  3.3V or 5V  Compatibility  mikroBUS  Click board size  L (57.15 x 25.4 mm)  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      MCP3551 chip select  CS  3  CS  TX  14  NC    SPI clock pin  SCK  4  SCK  RX  13  NC    SPI slave data out pin  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  Jumpers and settings Designator  Name  Default  Position  Default  Option  Description  JP1  VCCIO  SEL.  Left  3V3  Power Supply Voltage Selection 3V3/5V, left position  3V3, right position 5V  JP2  ADC  SEL.  Left  EXT  Analog signal selection. Left position ADC located on the  click board, right position AN pin of mikroBUS™    LEDs, Buttons, Switches, Connectors, etc. Designator  Name  LD1  PWR  LED  Type (LED,  BUTTON...)    Description  Power LED, lights green when power supply is established  properly.  Programming Code examples for Ozone 2 click, written for MikroElektronika hardware and compilers are available on Libstock. Code snippet The following code snippet outputs data from Ozone 2 click ADC reader via UART 01: void Ozone_2_Task() 02: { 03: uint32_t readValue; 04: uint8_t loggerTxt [40]; 05: readValue = OZONE2_Read(); 06: LongToStr(readValue, loggerTxt); 07: UART1_write_text("rnRead value:"); 08: UART1_write_text(loggerTXT); 09: 10: delay_ms(1000); 11: }                                                                  https://shop.mikroe.com/ozone‐2‐click 9‐29‐17