MQ-9 sensor

Other Hardware Sensors
1

Hi.
I'm trying get CO measures with a MQ-9 sensor but until now no success.
Im using the pins:

VCC - Connected to Arduino 5V
GRD - Connected to Arduino Ground
A0 - Connected to Arduino A0 port

  1. This is giving me value around 600 from sensor value. Is this ok for an indoor enviroment without gas leaking?(I hope) =p

  2. I noted that the DOUT LED is always ON with green light and checking the D0 pin is giving me zero always

  3. I tryed change the potenciometer but nothing changed. The analog exit value stayed the same and the DOUT LED kept green

2

Post a link to the exact module that you are using.

The MQ sensors generally need to be "burned in" for 24 to 48 hours before any readings can be trusted, and the sensor must also be calibrated using a known CO source in order to interpret the readings.

Excellent tutorial here: http://www.maskau.dk/projects/electronic-nose

3

I'm using this sensor:
MQ-9

The sensor was kept working during this weekend and today's morning was showing an analog value of 280(of 1023). Friday was showing values around 600.

I'm gonna read the tutorial to see if it can help me in calculate the ppm.
Thxs a lot!