// MH MQ Sensor Flying Fish - Analog & Digital Reader int analogPin = A0; int digitalPin = 2; float sensorVoltage; float Rs; // Sensor resistance float ratio;
Additionally, most boards expose:
| Module | Sensor | Target Gases | |--------|--------|---------------| | MH-MQ2 | MQ-2 | Methane, LPG, Smoke, Hydrogen | | MH-MQ3 | MQ-3 | Alcohol, Ethanol, Benzine | | MH-MQ5 | MQ-5 | LPG, Natural gas, Town gas | | MH-MQ7 | MQ-7 | Carbon Monoxide (CO) | | MH-MQ9 | MQ-9 | CO, Methane, LPG | | MH-MQ131 | MQ-131 | Ozone (O₃) | | MH-MQ135 | MQ-135 | NH₃, NOx, CO₂, Smoke, Benzene | Mh Mq Sensor Flying Fish Datasheet
Real-time voltage (0–5V) proportional to gas concentration.
Serial.print("Analog: "); Serial.print(analogValue); Serial.print(" // MH MQ Sensor Flying Fish - Analog
Each "Flying Fish" module is typically fitted with one specific sensor from the table below: MQ-2 Semiconductor Sensor for Combustible Gas - Pololu
The board works as follows:
Since the "Flying Fish" module utilizes a standard MQ sensor, you should look for the datasheet of the specific model printed on the metal can (e.g., MQ-2, MQ-3, MQ-5, MQ-7, MQ-135). Interpreting this datasheet is crucial for accurate readings. Here are the critical sections you need to understand:
TTL high/low signal based on a threshold set by the onboard potentiometer. Here are the critical sections you need to