user38699: I am new to arduino and sensor. I am going to do a project related to E-nose to detect children breath odor. I wanted to use few sensors including 
Figaro TGS2602, TGS2600, TGS825, TGS2620 and TGS2180 together with arduino. May I ask is it possible for an Arduino Uno or Mega to support all these 5 sensors at one time? 

user4143: They are all analog sensors, so yes - you have 6 analog inputs on an Uno and 5 analog sensors, so you have one spare analog pin to do something else with if you want.

38699: <p>I am new to arduino and sensor. I am going to do a project related to E-nose to detect children breath odor. I wanted to use few sensors including 
Figaro TGS2602, TGS2600, TGS825, TGS2620 and TGS2180 together with arduino. May I ask is it possible for an Arduino Uno or Mega to support all these 5 sensors at one time? </p>
 4143: <p>They are all analog sensors, so yes - you have 6 analog inputs on an Uno and 5 analog sensors, so you have one spare analog pin to do something else with if you want.</p>
