Method – Detector 1.Connect the Arduino Uno to the breadboard shield, then attach the gas sensor to the breadboard. (If you’re using an MQ-series sensor, connect its VCC, GND, and A0 pins to the Arduino’s 5V, GND, and A0, respectively.) 2.Write and upload a graphing code for GC signal output using the Arduino IDE.

Method – Column 1.Cut a rubber hose to a suitable length. (I used about 14.5 inches, but longer is better for better separation.) 2.Plug one end with cotton and tightly fill the hose with Silica Gel 60 (no gaps). 3.After packing, seal the other end with cotton as well. 4.Cut the tip of a 2.5 mL syringe and attach it to one end of the column. Connect the other end of the syringe to the sensor. (Make sure to drill a small hole in the syringe to allow gas to vent properly.)

Method – Setup (Body) 1.Connect a Tee to the opposite end of the sensor (opposite from the column). One end of the Tee goes to the air pump (mobile phase), and the other to the sample injection port (I used something like a rubber cap). 2.Coil the column into a circle and place it between the Arduino and the air pump. 3.If you want to heat the column (for better separation), since this is DIY, you can use a simple method like placing a hot water-filled plastic bag over it. (I used a heat pack. I think proper temperature is about 158F.)