Keyes MQ-3 Gas Sensor Module (Alcohol, Ethanol, Smoke) + Free Cable

MQ3 เซ็นเซอร์โมดูล เหมาะสำหรับใช้ตรวจจับแก๊สจำพวก Alcohol, Ethanol, Smoke สามารถตรวจจับได้ระดับความเข้มข้นของแก๊สที่ช่วง 10 - 1000 ppm

โดยหลักการทำงานของ MQ3 มีดังนี้

Sensitive material of MQ-3 gas sensor is SnO2, which with lower conductivity in clean air. When the target alcohol gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. The circuit on the module converts change of conductivity to correspond output signal of gas concentration.

MQ-3 gas sensor has high sensitity to Alcohol, and has good resistance to disturb of gasoline, smoke and vapor. The sensor could be used to detect alcohol with different concentration, it is with low cost and suitable for different application. 

ตัวอย่าง Arduino Code สำหรับอ่านค่า MQ3 Gas Sensor Module

 void setup()

{
Serial.begin(9600);
}

void loop()
{
int val;
val=analogRead(0);
Serial.println(val,DEC);
delay(100);
}

Datasheet: http://www.pololu.com/file/0J310/MQ3.pdf

Features :

1. Signal output instructions;
2. Dual signal output (analog output, and TTL level output);
3. TTL output valid signal is low, can be connected directly to the microcontroller;
4. 0 ~ 5V analog output voltage, the higher the concentration the higher the voltage;
5. Has a high sensitivity and good selectivity to ethanol vapor;
6. Has a long life and reliable stability;
7. Rapid response recovery characteristics;

Specification:

• Size: 32mm X22mm X22mm(LxWxH)
• The main chip: LM393, MQ-3 gas sensor
• Operating voltage: DC3-5V

Arduino Connecting