MQ-4 Methane CNG NGV Gas Sensor เป็นเซนเซอร์ตรวจจกับแก๊สมีแทน CNG NGV มี Output ให้เลือกใช้งานทั้ง Analog และ Digital โดยมี Potentiometer เป็นตัวกำหนดจุดทำงานในการอ่านค่าเซนเซอร์แบบ Digital โมดูลใช้ไฟเลี้ยง 5V

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สอนการใช้งานบอร์ด Arduino กับ Module sensor MQ-4 (Methane gas sensor)

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This is a simple-to-use compressed natural gas (CNG) sensor, suitable for sensing natural gas (composed of mostly Methane [CH4]) concentrations in the air. The MQ-4 can detect natural gas concentrations anywhere from 200 to 10000ppm.

This sensor has a high sensitivity and fast response time. The sensor’s output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.

This sensor comes in a package similar to our MQ-3 alcohol sensor, and can be used with the breakout board below.

Features :

• using high-quality double-panel design, with power indication and TTL signal output indication; 
• with DO switch signal ( TTL) output and AO analog signal output; 
• TTL output valid signal is low level. (When the output is low, the signal light is on, it can be directly connected to the MCU or relay module.) 
• The voltage of the analog output is higher. The higher the concentration, the higher the voltage. 
• Good sensitivity to methane and natural gas detection. 
• there are four screw holes for easy positioning; 
• product dimensions: 32 (L) * 20 (W) * 22 (H)

ตัวอย่างโปรแกรม

int sensorValue;

void setup()
{
Serial.begin(9600); // sets the serial port to 9600
}
void loop()
{
sensorValue = analogRead(0); // read analog input pin 0
Serial.println(sensorValue, DEC); // prints the value read
delay(100); // wait 100ms for next reading
}