Introduction: Arduino LM35 + MQ2
In this project i want a device that uses bolt MQ2 and LM35 for a basic alert system
Step 1: What We Need?
1. First we need an arduino microcontroller
2. LM35 temperature sensor
3. MQ2 smoke and gas sensor
4. We need 6 1K ohm resistors
5. 5 Leds
6. Some jumper wires
7. 1 Breadbord
8. 1 Buzzer
Step 2: Lets Hook Up LM35 and Its Leds
First connect LM35 and leds just like in the picture and then connect middle leg of LM35 to arduinos analog pin 0 and right leg to + line and left leg to - line and connect blue leds + output to pin 13 and - input to - line with 1K resistor yellow leds output pin 12 and - input to - line with 1K resistor red leds output to pin 11 and - input to - line with 1K resistor and that is it
Step 3: Lets Hook Up MQ2 and Its Leds and Buzzer
First connect everything just like in the picture connect right leg of the sensor to analog pin 1 and vcc to + and gnd to - and connect buzzers - to - with 1K resistor and + to pin 8 and blue leds - to - with 1K resistor and + to pin 9 and red leds - to - with 1K resistor and + to pin 10 and thats it
Step 4: Code
Sorry but I couldnt write it to here but you can write it from the video and from the pictures
Step 5: Video
Hope you can make it and use it
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