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 ~ 240K┯ (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
Additional information
| Weight | 0.016 kg |
|---|
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