I have an MQ-2 sensor connected to Arduino Nano and i read values with analog A0 pin.
Arduino 5V goes to the VCC pin and the Arduino Ground to the GND pin on the sensor.
When i hold an butan torch under it i can se the values in serial monitor changes from around 100 to 5-600.
But it does not seams to detect smoke from for example my solder iron. (solder fume). It does not detect smoke from burned wire isolation either.
Is it something i doing wrong?