sensor gas Displayed on 7 segment
The MQ-4 gas sensor modules are used in gas leakage detecting equipments, they are suitable for the detection of CH4,Natural gas.LNG, avoid alcohol and cooking fumes and cigarette smoke with this sensor.
- High sensitivity to CH4 and Natural gas
- Slight sensitivity to alcohol, smoke
- Fast response
- Stable and long life
- Simple drive circuit
- VCC - 5V
- GND - GND
- A0 - Analog pin7
- D0 - LED
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Geekcreit® ATmega328P Nano V3 Controller Board Compatible Arduino Improved Version
Gas Sensor Module For Arduino |
Code
int sensorValue;
int num;
void setup()
{
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
Serial.begin(9600);
}
void loop()
{
sensorValue = analogRead(7);
if (sensorValue < 300)
{
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4, LOW);
digitalWrite(5, LOW);
digitalWrite(6, LOW);
digitalWrite(7, LOW);
digitalWrite(8, LOW);
digitalWrite(2, LOW);
digitalWrite(3, HIGH);
delay(200);
digitalWrite(3, LOW);
digitalWrite(4, HIGH);
delay(200);
digitalWrite(4, LOW);
digitalWrite(5, HIGH);
delay(200);
digitalWrite(5, LOW);
digitalWrite(6, HIGH);
delay(200);
digitalWrite(6, LOW);
digitalWrite(7, HIGH);
delay(200);
digitalWrite(7, LOW);
digitalWrite(2, HIGH);
delay(200);
}
else
{
if (sensorValue >= 750)
{num = 9;}
else if (sensorValue >= 700)
{num = 8;}
else if (sensorValue >= 650)
{num = 7;}
else if (sensorValue >= 600)
{num = 6;}
else if (sensorValue >= 550)
{num = 5;}
else if (sensorValue >= 500)
{num = 4;}
else if (sensorValue >= 450)
{num = 3;}
else if (sensorValue >= 400)
{num = 2;}
else if (sensorValue >= 350)
{num = 1;}
else if (sensorValue >= 300)
{num = 0;}
}
switch (num)
{
case 9:
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, LOW);
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
break;
case 8:
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, HIGH);
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
break;
case 7:
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, LOW);
digitalWrite(6, LOW);
digitalWrite(7, LOW);
digitalWrite(8, LOW);
break;
case 6:
digitalWrite(2, HIGH);
digitalWrite(3, LOW);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, HIGH);
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
break;
case 5:
digitalWrite(2, HIGH);
digitalWrite(3, LOW);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, LOW);
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
break;
case 4:
digitalWrite(2, LOW);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, LOW);
digitalWrite(6, LOW);
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
break;
case 3:
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, LOW);
digitalWrite(7, LOW);
digitalWrite(8, HIGH);
break;
case 2:
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, LOW);
digitalWrite(5, HIGH);
digitalWrite(6, HIGH);
digitalWrite(7, LOW);
digitalWrite(8, HIGH);
break;
case 1:
digitalWrite(2, LOW);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, LOW);
digitalWrite(6, LOW);
digitalWrite(7, LOW);
digitalWrite(8, LOW);
break;
case 0:
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, HIGH);
digitalWrite(7, HIGH);
digitalWrite(8, LOW);
break;
}
}
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