Smoke and Gas Sensor

HOW TO MANUFACTURE A SMOKE AND GAS SENSOR WITH THE MQ-02.
By Samuel Ramírez Martínez 08/03/2019
Materials:
- MQ-02 smoke and gas sensor
- Arduino whatever
- 2 leds one green and one red
- 1 buzer (buzzer)
- Wire to do the project
Instructions:
First you have to leave our sensor on for 24 hours so that the measurements are correct otherwise it will not work.
Smoke and gas sensor photo:

Arduino uno Rev3 photo

Connections:
 -Digital pin 2 to negative pin of the red LED and to the negative pin of the buzer.
- Digital pin 3 to negative pin of the green led.
-Analog pin 0 to the analog pin of the sensor called DATa.
If you want or have not understood the intuitions and also want to see the operation before doing the project you can watch this video: