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- Product Code: MIKROE-1586
- MPN: MIKROE-1586
Alcohol click has a high sensitivity to alcohol and it can be used to detect alcohol in concentrations from 0.04 to 4mg/l.
Alcohol click carries an MQ-3 Semiconductor sensor for alcohol. The click is designed to run on a 5V power supply only. It communicates with the target microcontroller through the AN pin on the mikroBUS™ line.
MQ-3 sensor features
The gas sensing layer on the sensor unit is made of Tin dioxide (SnO2), an inorganic compound which has lower conductivity in clean air. The conductivity increases as the levels of alcohol gas rise.
Calibrating the sensor
To calibrate the sensor for the environment you’ll be using it in, Alcohol click has a small potentiometer that allows you to adjust the Load Resistance of the sensor circuit.
Key features
- MQ-3 sensor
- Concentration: 0.04-4mg/l alcohol
- Sensitivity: Rs(in air)/Rs(0.4mg/LAlcohol)≥5
- Interface: Analog
- 5V power supply
Specification
Type | Gas |
Applications | Portable alcohol detector, breathalyzer for estimating BAC (blood alcohol content) |
On-board modules | MQ-3 Semiconductor sensor for alcohol |
Key Features | Designed to use a 5V power supply |
Key Benefits | Potentiometer for calibration |
Interface | Analog |
Input Voltage | 3.3V or 5V |
Compatibility | mikroBUS |
Click board size | M (42.9 x 25.4 mm) |
Pinout diagram
This table shows how the pinout on Alcohol click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
Programming
Code examples for Alcohol click, written for MikroElektronika hardware and compilers are available on Libstock.
Code snippet
The following code snippet shows how to initialize the click, and then read from it, showing the values on the display every 500 ms.
01 void main() { 02 03 LCD_Init(); // Initialize Lcd 04 Lcd_Cmd(_LCD_CLEAR); // Clear display 05 Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off 06 Lcd_Out(1,1,"Alcohol click"); // Write text in first row 07 08 ANSELA = 0x04; // Set ADC on RA2 09 TRISA = 0x04; // Set RA2 as input 10 LATA = 0; // Set PORTA as 0 11 ADC_Init(); // Initialize ADC 12 delay_ms(100); // Pause of 100ms for ADC module stabilization 13 14 //Initial read ADC and display PPM value on LCD 15 readSensor(); // Read sensor 16 calculatePPM(); // Calculating PPM value 17 18 FloatToStr(ppm,&txt); // Conversion float ppm to string txt 19 LCD_Out(2,14,"ppm"); // Print text on LCD 20 LCD_Out(2,1,txt); // Print txt value on LCD 21 22 while(1) { 23 24 delay_ms(500); // Pause 500ms 25 readSensor(); // Read sensor 26 calculatePPM(); // Calculating PPM value 27 FloatToStr(ppm,&txt); // Conversion float ppm to string txt 28 LCD_Out(2,1,txt); // Print txt value on LCD 29 30 } 31 }