MQ-2
General Description:
The gas sensor (MQ2) module is useful for gas leakage detection (home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke, or Propane. Due to its high sensitivity and fast response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by a potentiometer.
Working Principle:
The MQ-2 gas sensor employs a tin dioxide (SnO2) based sensing element, heated for optimal performance. In the presence of oxygen, the sensor's surface is coated with oxygen ions, hindering electron flow and maintaining a high resistance state. When exposed to reducing gases, these oxygen ions are consumed, leading to a decrease in the sensor's resistance and enabling current flow. This change in conductivity is proportional to the concentration of the gas, allowing for the quantification of gas levels based on the sensor's output voltage.
Specifications:
- Having an IC chip LM393 voltage comparator.
- Operating Voltage (VCC) is 3v-5v.
- It has the signal output indicating LED.
- Having the dual signal output (analog and TTL output).
- Long working life and stable performance by MQ-2.
- It is highly sensitive to Gas Methane (CNG) detectors.
- Operating Temperature: -10°C to 50°C.
Requirements
| S. No. | Component Name | Values |
|---|---|---|
| 1 | LM393 (Voltage Comparator) IC | |
| 2 | MQ-2 Gas Sensor | |
| 3 | Resistors | 472 |
| 4 | Capacitors | 106, 104, 105 |
| 5 | Male Connectors | 4 |
| 6 | Variable Potentiometer | 10k |
| 7 | Inductor | 100uH |
Pin configuration:
| S. No. | Pins | Pin Description |
|---|---|---|
| 1 | SIG | Output pin |
| 2 | NC | No connection |
| 3 | VCC | Input voltage (3V to 5V) |
| 4 | GND | Ground |
Applications:
- Gas leakage detection
- Toys
- IoT Applications
- Smart Detections
