CO sensor

Other Hardware Sensors
1

Hi I have a CO sensor with a sku # 20-011-959
I am using a Arduino UNO and SainSmart MEGA2560 R3 Development Board Compatible With Arduino . what im actually trying to do, is use the CO sensor to drive a blower fan, if the CO sensor has a high CO reading, then the fan should increase accordingly.

2

Sounds like a nice project,

Note that a fan needs to be controlled by a power transistor like here

If you have questions please post the code you have so far and a link to the datasheet of the sensor.

3

thanks, I think it will be challenge to develop :smiley: and I have the burner and I want to automate blower speed.

Ive looked everywhere for the data sheet for the CO sensor but cant find it. the part number is 20-011-959

4

Hi, if you dig enough at the sainsmart page that they feature the sensor you find this.
(Tutorial Tag) on sales page.

Tom...... :slight_smile:
Biblical Filing System,,, Seek and ye shall find.. (Google rocks)

5

Hi thanks for the help. I might have to make my own sensor, the sampling environment in the combustion chamber is dusty (solid fuel) and is at a moderate temp around 450 f. The next stage (after burner) is way hotter so I cant put the sensor there.

Im going to have to make the sensor it should be analog and the output to the blower fan should be analog also.

any ideas on analog input to analog output are welcome :smiley:

6

Boy I had a hardtime using the forum with IE im using firefox and its much easyier to log in.

For years I have been using a PWM circuit to control the blower fan speed and that has worked really good, I drive the fan output with a mosfet and the pwm to drive the mosfet. Im thinking the Arduino to replace the pwm circuit for my solid state relay. Ware is the best place to look on the forum here for that type of output.

7

Well I could not find the exact spec sheet for the 20-011-959. It consists of a circuit board with the MQ-7 CO sensor mounted to it.

So I just decided lets put this thing on a bread board and go at it.

There are 4 pins coming from the board G-AO-DO-V

I hooked 5v to V AND G to ground (for the 5v source)

I was then able to see a red led turn on when I briefly hit the sensor with my lighter.

I was getting strange readings from the AO pin.

What I found was that if I hooked my DVOM to V and DO I got a nice solid reading. it ranged from 0v to 4.58v when it activated.

Now I can move forward with this project. :smiley:

8

Well I made a good sensor controller with the light activated servo project. I used the servos pwm output to drive a mosfet controlling the fan or blower motor.

I then took the analog input from the CDS cell and replaced it with my CO sensor analog output.

Bingo, anytime the CO sensor detects something the fan speed increases, when sensor does not detect anything the fan speed decreases. The output is variable not just on and off.