This circuit mainly uses MQ2 Smoke/Gas sensor and Arduino to detect and calculate the level of smoke. MQ2 gas sensor is ... (output connected at pin D7). Also smoke sensor output is connected at an ..

Power up the sensor through Arduino and connect the A0 pin of the sensor to A5 of Arduino. Connect a buzzer and an LED in a parallel configuration. Connect their one end to the ground of Arduino and ...

The following image shows the circuit diagram for interfacing the flame sensor module with Arduino. Connections are pretty simple and only require three wires. Connect the VCC and GND of the module to ...

Smoke Detection: The MQ-2 sensor detects smoke or harmful gases by measuring the concentration in the air. When the smoke level exceeds a set threshold, the system activates the buzzer and LED. Alert: ...

Fig. 1 shows circuit diagram of the smoke detection alarm. The basic unit employs dual op-amp LM358 (IC1), transistor T1 and timer NE555 (IC2), configured in astable mode. Selection of MQ* sensor is ...

return val; } /***** MQRead ***** Input: mq_pin - analog channel Output: Rs of the sensor Remarks: This function use MQResistanceCalculation to caculate the sensor resistenc (Rs). The Rs changes as ...