MQ5 gas detection alarm circuit electronic production diy kit

The MQ-5 gas detection sound and light alarm kit has a high assembly success rate. It can solve many security risks. To prevent gas and natural gas poisoning accidents, we must conduct regular inspections of places where gas leaks may occur. The gas detection and alarm circuit is composed of gas sensor MQ5, voltage comparator LM393, voice chip C002 and other components. It can detect combustible gases in the air and automatically sound and light alarm.

Kit parameters:
Product name: MQ-5 gas detection and alarm kit
Product model: TJ-56-223
Power supply voltage: DC5V (DC power supply)
Board size: 61*32mm

Soldering Instructions:
1. Component placement, the correct one is to insert on the side with words, see the finished product picture for details.
2. The positive and negative poles of the LED and the buzzer are distinguished, and the long legs are all positive poles.
3. The triodes are all different models, pay attention to distinguish them, and correspond to the models on the board one by one.
4. Pay attention to the direction of chip soldering, and the direction of the notch should correspond to the silk screen pattern of the board one by one.
5. After the welding is completed, the power will keep ringing, just adjust the potentiometer and reduce the sensitivity.

Circuit principle:
The gas sensitive material used in the MQ-5 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. Increase and increase, suitable for household or industrial gas, natural gas, and liquefied petroleum gas detection devices, and has excellent anti-ethanol and smoke interference capabilities, and is an economical sensor suitable for various applications. C002 is a three-tone optional alarm voice chip, internally storing the sounds of police car 110, fire alarm 119 and ambulance 120, externally connected with an oscillating resistor 100K~240KQ (the larger the resistance, the slower the sound speed), it can be driven after power on The buzzer sounds. Pin 1 is grounded, pin 2 is output, pin 3 is used to select the sound end, pin 4 is connected to the positive pole of the power supply, and pins 5 and 6 are connected to the oscillation resistor. The gas detection alarm circuit adopts the alarm sound of fire alarm 119, and its working voltage is generally 4.5V.