Hi! I'm new to Arduino and I am really struggling with a sensor. I have an off-brand MQ-2 sensor with an out, VCC and GND wire, as well as a buzzer, however, I am struggling to connect it to my Arduino shield board. all the ports are different, and I have tried researching how to do it but have got no results. If anyone could help me attach the sensor and buzzer to the sensor shield so that when the sensor senses gas or smoke, the buzzer goes off, then I would be very very appreciative. Thanks!
The people here on the forum are very special.
Sometimes they even guess what the person needs.
I think some of them are masters at fortune telling. (Or even wizards).
But since everything has a limit, I think it will be difficult to help you.
See:
You didn't tell us what your Arduino is, what your shield is, what model your module with the MQ-2 is, what your buzzer is.
I'm going to guess your Arduino... It's an Arduino UNO... Did I get it right?
Now tell us and we'll try to help you.
The web search phrase "Arduino MQ-2 sensor" will find lots of tutorials.
Be sure to "burn in" the sensor (leave it powered on) for 48 to 72 hours before making any measurements with it.
hi ruilvana. I appreciate the attitude. its very motivating. as in the title of my post, it is an arduino uno. the MQ-2 sensor is a Keyes K869051, and the buzzer doesn't have a name I can find but it has 2 pins, a positive and a negative. the shield is the arduino sensor shield v5.0. hope this is enough information and sorry for offending all the wizards on this platform 
Have you studied any of the many Arduino+MQ sensor tutorials on line?
This is your shield pinout:
And I think this is your MQ-2 sensor:
You need to connect the sensor's VCC pin to the shield's +5V pin, the GND pin to the shield's GND pin, and the OUT pin to any pin from Analog IN 0 to 5.
Your buzzer (since you didn't specify the model) can be active or passive.
It is probably passive and it is common to use it by connecting the red wire to the Arduino's pin (2 to 13) Analog IN (0 to 5, exclude sensor used), and the black wire to GND.
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