MQ5 Gas Detection and Alarm Circuit Board DIY Parts Support Sound and Light Alarm Sensor Kit

Brief introduction of circuit principle The gas sensitive material used in the MQ 5 gas sensor is tin dioxide Sn02 with low conductivity in clean air When there is combustible gas in the environment where the sensor is located the conductivity of the sensor varies with the concentration of combustible gas in the air Increased and increased suitable for household or industrial detection devices for gas natural gas liquefied gas and has excellent resistance to ethanol smoke interference is an economical sensor suitable for a variety of applications C002 is a three selectable alarm sound voice chip that internally stores the sounds of police cars fire alarms and ambulances The external oscillation resistance is lOOOK 240KΩ the greater the resistance the slower the sound speed and the buzzer can be driven after power is turned on Speak Pin 1 is grounded pin 2 is output pin 3 selects the sound terminal pin 4 is connected to the positive pole of the power supply pins 5 and 6 are connected to the oscillating resistor The gas detection and alarm circuit selects the alarm sound of fire alarm 119 and its working voltage is generally 2 4 3 6V Package includes 1 x DIY KIT