Gas Level Indicator

Gas Level Indicator

Image: LPG cylinders.JPG by Evil Monkey via Wikimedia Commons, CC BY 2.5

How It Works

• A pressure sensor (or an MQ-series sensor calibrated for the specific gas) reads a signal proportional to the remaining gas level in the tank.
• The controller converts this reading into an approximate percentage-remaining value, shown continuously on an LCD.
• When the level drops below a preset threshold, the controller triggers a buzzer and LED warning, giving the user advance notice before the tank runs dry.
• In an extended build, a GSM module can text a low-level alert directly to the user's phone instead of relying on someone noticing the local warning.

Components

Arduino Uno
Pressure sensor or MQ-series gas sensor
16x2 LCD display
Buzzer + LED indicator
Optional GSM module for remote SMS alerts

Applications

• Household LPG cylinder level monitoring
• Industrial gas tank level tracking
• Safety monitoring in gas-dependent processes

Advantages

• Gives advance warning before a gas supply runs out completely
• Removes the need to physically check the cylinder by weight or sound
• Extendable to remote SMS alerts for unattended tanks

Sample Code — Gas Level Threshold Alert

// Simplified gas level monitoring - Arduino
int gasSensorPin = A0;
int buzzerPin = 8;
int lowLevelThreshold = 150; // calibrate to sensor + tank characteristics

void setup() {
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int level = analogRead(gasSensorPin);
  Serial.println(level);

  if (level < lowLevelThreshold) {
    digitalWrite(buzzerPin, HIGH);
    Serial.println("LOW GAS LEVEL - refill needed");
  } else {
    digitalWrite(buzzerPin, LOW);
  }
  delay(2000);
}

Related Research

• Smart LPG Gas Level Detection and Safety System using IoT — IJERT