• Arduino UNO with USB Cable - 1
• MQ4 gas sensor - 1
• breadboard 400 points – 1
• OLED LCD Display – 1
• Jumper Wires male to female – 40 pcs
• Jumper Wires male to male – 40 pcs
• 9v Battery -1
• Dc Jack – 1
• Piezo Buzzer – 1
• Led – 2

MQ4 sensor can sense methane / natural gas easily with a range sensitivity from 300 to 10000ppm, costs are very low, and can be easily plugged with Arduino boards.

MQ4 GAS SENSOR – METHANE NATURAL GAS MONITOR WITH MQ3 / MQ4 SENSORS

HARDWARE REQUIRED

• Arduino UNO with USB Cable - 1
• MQ4 gas sensor - 1
• breadboard 400 points – 1
• OLED LCD Display – 1
• Jumper Wires male to female – 40 pcs
• Jumper Wires male to male – 40 pcs
• 9v Battery -1
• Dc Jack – 1
• Piezo Buzzer – 1
• Led – 2

SOFTWARE REQUIRED

Arduino IDE 1.8.5 (programmable platform for Arduino)

Click To Download :https://www.arduino.cc/en/Main/Software

SPECIFICATIONS

MQ-4 GAS Sensor Module

• Detection Range: 300 ~ 10000ppm
• Characteristic Gas: 5000ppm methane
• Sensitivity: R in air/R in typical gas≥5
• Resistance of Sensitive Material: 1KΩ～20KΩ in 5000ppm methane
• Response Time: ≤10s
• Recovery Time: ≤30s
• Heating Resistance: 31Ω±3Ω
• Heating Current: ≤180mA
• Heating Power: ≤900mW
• Heating Voltage: 5.0V±0.2V
• Measuring Voltage: ≤24V
• High sensitivity to CH4，Natural gas
• Small sensitivity to alcohol, smoke
• Fast response
• Stable and long life
• Simple drive circuit

Working condition of MQ-4:

• Environment Temperature: -20℃～+55℃
• Humidity: ≤95%RH
• Environment Oxygen Content: 21%

Storage condition of MQ-4:

• Temperature: -20℃～+70℃
• Humidity: ≤70%RH

OLED DISPLAY

• Voltage: 3V ~ 5V DC. Working Temperature: -30 ℃ ~ 70 ℃
• Ultra-low power consumption: full screen lit 0.08W
• Supports many control chip: Fully compatible with Arduino, 51 Series, MSP430 Series, and STM32 / 2, CSR IC, etc.
• High resolution: 128 * 64. Viewing angle:> 160 °

PIN DESCRIPTION

MQ-4 GAS Sensor Module

• 1 pin VCC 5v
• 1 pin GND
• 1 pin DO (digital output) TTL digital 0 and 1 (0.1 and 5V)
• 1 pin AO (analog output) 0.1-0 .3 V (clean), the highest concentration of voltage around 4V

Led

CIRCUIT CONNECTION

1. Connect led with one ground and other to pin no 10 of Arduino Uno
2. Connect Buzzer’s one point to gnd and another pin to pin no 9 of Arduino uno.
3. Connect mq-4 gas sensor’s gnd to gnd, vcc to vcc, analog output to pin a0 of arduino Uno.
4. Now connect the oled vcc to vcc, gnd to gnd , scl to arduino scl pin no 16 and sda to Arduino pin no 17 sda.
5. Now upload the code.

CODE

Click to see the code:

https://docs.google.com/document/d/e/2PACX-1vRVGmmDw1epvdrcL-TEIy9gcREcHmSyc4DJCbBUFa7b4CjsC4kannKNjNHaIG87EmN0mFoBAyHaxxzA/pub

WORKING

Upload the code and see the data on OLED Display measured by MQ-4 Gas Sensor.