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Step 4Co2 Sensor
Initially I had ordered an MG811 Co2 sensor by itself, after setting it up I couldn't make it work properly so I ordered one already on a board with an op amp amplifier built in.
I later found that the power supply I was running it with was faulty and the heating element in the Co2 sensor was running on overdrive.
Basically the circuit has the sensor hooked up to a non-inverting op-amp with roughly a gain of ten, and the heating element is supplied by a 6 volt voltage regulator. The set up is shown on the datasheet attached with pinouts of the sensor which is self explanatory, what isn't self explanatory is the graph on the datasheet which gives a totally inacurate picture of the expected output of the sensor.
Give it a test by placing a Multimeter on the sensor and breathing on it, it should change reading.
I later found that the power supply I was running it with was faulty and the heating element in the Co2 sensor was running on overdrive.
Basically the circuit has the sensor hooked up to a non-inverting op-amp with roughly a gain of ten, and the heating element is supplied by a 6 volt voltage regulator. The set up is shown on the datasheet attached with pinouts of the sensor which is self explanatory, what isn't self explanatory is the graph on the datasheet which gives a totally inacurate picture of the expected output of the sensor.
Give it a test by placing a Multimeter on the sensor and breathing on it, it should change reading.
MG811Datasheet.pdf(595x842) 146 KB| « Previous Step | Download PDFView All Steps | Next Step » |
As you told about that website, i have checked the product, its cost is around $35, but i want to know exact amount i should pay for delivery to India.
Hence i am asking you to tell me the amount you paid for the same.
Thank you.
It is a bit pricey. You can always skip this equipment and just set up the relay to turn on to drive a pump to exchange air for a specific amount of time every hour or so. (or use a timer :) )
I have had good results with this.
Also, the Co2 sensor is the most sensitive being logarithmic and is difficult to calibrate.
This is up to you though.
Cheers
Anthony
What sort of output data did you end up getting with the Parralax sensors? Great work btw!
It was the MG811 co2 sensor, I got the sensor in kit with omp amps from parallax on the web. Google for parallax co2 sensor gets you there.
Thanks
Anthony