Hello, I am using this sensor: https://wiki.seeedstudio.com/Grove-Gas_Sensor-O2/
and am interfacing it with an arduino uno. To do this I am merely splicing the 4 pin connector and connecting vcc to 5V, GND to GND and SIG to an analog pin on the arduino. I have left the NC pin unconnected. Is this ok? I did this after referencing the schematic for the board which indicates no connection.
Hi @KeanMartinic, Yes. that’s fine. as per the schematic you don’t need to use NC pin, which is No Connection pin.
Awesome, thank you sir!
Great 
, Happy Making 