Grove - Alcohol Sensor Module (ของแท้ Seeed Studio) + Free Cable

• Alcohol level over-limit alarm
• Stand-alone / background sensing device
• Environmental monitoring equipment

Features

• Grove Compatible connector
• Highly sensitive to alcohol.
• Fast response and resumes quickly after alcohol exposure.
• Long life.
• Compact form factor.

Cautions

• Alcohol sensor is very sensitive semiconductor device. Handle with care.
• Do not expose to organic silicon steam, alkali or corrosive gases.
• Do not use freeze or spill water.
• Maintain proper working voltage.

Specification

ItemMinTypicalMaxUnitOperating VoltageCurrentDetection GasDetectable Concentration

Application Ideas

• Breathalyzer - Alcohol over-limit detection
• Environmental monitoring equipments

Usage

The Alcohol Sensor MQ303Q requires adequate current (150mA). The power source is from VCC of Grove Connector. The following sketch demonstrates some applications.

• Github - Demo using Alcohol Sensor
• Github - Air_Quality_Test_Box
• Github - Grove_Alcohol_Sensor

วิธีใช้งาน

http://www.seeedstudio.com/wiki/How_to_choose_A_Gas_Sensor

http://www.seeedstudio.com/wiki/Grove_-_Alcohol_Sensor

https://github.com/Seeed-Studio/Travelling_Mine

Download Code and Upload

Upload the following sketch. Please click here if you do not know how to upload.

//MQ303A Testing - A simple sketch to understand the working of Alcohol sensor. Can be used to study how to calibrate threshold values.

//Alcohol Sensor DAT Pin is connected to Analog Input Pin 0 (A0)
#define analogInDatPin 0

//Alcohol Sensor SCL Pin is connected to Analog Input Pin 1 (A1). In this case it is used as digital ouput.
//15 is mapped to A1
#define heaterSelPin 15

int sensorValue = 0;

void setup()
{
pinMode(heaterSelPin,OUTPUT); // set the heaterSelPin as digital output.
digitalWrite(heaterSelPin,HIGH); //when heaterSelPin is set, heater is switched off.
Serial.begin(9600); // open the serial port at 9600 bps
}

void loop()
{
digitalWrite(heaterSelPin,LOW); //switch on the heater of Alcohol sensor
sensorValue = analogRead(analogInDatPin); //read the analog value


Serial.print("sensor test value = "); //Disply the results in serial monitor.

Serial.println(1023-sensorValue); // sensorValue goes down when alcohol is detected.
delay(100);
}

Click Upload to Upload the code, if you have any problem about how to start Arduino, please click here for some help.

Check Data

1) Sensor value after heating sensor for 5~10 mins and before exposure to alcohol:

2) Sensor value after exposure to alcohol: