Hello everybody
I have been working lately with VOC and Gas Sensor to check the quality of the air...I have found very nice tutorials:
http://itp.nyu.edu/blogblender/2007/04/07/gas-sensors/
So, both of them use a potentiometer as a variable resistance for the sensor...i think the reason is that this way you can control the sensor sensibility.
By the way I found out that Tom Igoes, in his book, uses a 4.7 resistor on the same pin which should be connected to the potentiometer...
And the in the first link's tutorial the author says something about Thermistors...???
The point is:
- Do you think that the resistor could substitute the potentiometer?
- the sensor get very hot, do you think it is possible to control their temperature?... If I'm not wrong i think that the thermistor are there for this reason right? to control heat and act as a resistor...Or am I getting all wrong?
Thank for the help!