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LPG GAS MONITOR Using MQ6 Sensor Raspberry pi Pico

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To detect the presence of LPG gas using the MQ6 gas sensor and display the gas concentration status on a 16×2 I2C LCD connected to a Raspberry Pi Pico.

Buy Basic Raspberry Pi Pico Kit

Items Required:

Connections:

  • MQ6 Sensor (Analog Output used)
  • VCC → Pico 3.3V
  • GND → Pico GND
  • AOUT → Pico ADC0 (GPIO26, Physical pin 31)
  • 16×2 I2C LCD
  • VCC → Pico 3.3V or 5V (based on your LCD module)
  • GND → Pico GND
  • SDA → Pico GP0 (Physical pin 1)
  • SCL → Pico GP1 (Physical pin 2)

Code: (main.py)

from machine import ADC, Pin, SoftI2C
from pico_i2c_lcd import I2cLcd
from time import sleep

# Setup I2C LCD
i2c = SoftI2C(sda=Pin(0), scl=Pin(1), freq=400000)
lcd = I2cLcd(i2c, 0x3f, 2, 16)

# Setup MQ6 gas sensor on ADC0
mq6 = ADC(Pin(26))  # GPIO26 / ADC0

# Function to determine gas level description
def get_gas_level(voltage):
    if voltage < 0.5:
        return "No Gas"
    elif voltage < 1.0:
        return "Low"
    elif voltage < 1.5:
        return "Moderate"
    elif voltage < 2.0:
        return "High"
    else:
        return "Dangerous"

lcd.clear()
lcd.putstr("LPG Gas Monitor")
sleep(2)
lcd.clear()

# Main loop
while True:
    raw = mq6.read_u16()
    voltage = (raw / 65535) * 3.3

    level = get_gas_level(voltage)

    lcd.move_to(0, 0)
    lcd.putstr("Voltage: {:.2f}V ".format(voltage))
    lcd.move_to(0, 1)
    lcd.putstr("Level: {:<11}".format(level))

    sleep(1)

Result:

The LCD displays the real-time analog voltage output from the MQ6 sensor.

The voltage is interpreted to determine gas concentration levels: No Gas, Low, Moderate, High, or Dangerous.

Updates occur every second for live monitoring of LPG gas levels.

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