Questions regarding Groove Oxygen sensor v1.1

Dear Sir/madam,

I have bought your Groove oxygen sensor v1.1 and directly coupled it to an

Arduino. When in normal air; I get 13.6% oxygen (1.3V). Do you have any

idea why this can be? I’m running a 5V arduino, powered the sensor via the

Arduino and set VRefer to 5.

Second question; I have not connected the NC wire; what is this used for?

Hi there,1. please try below code. <LINK_TEXT text=“ …”></LINK_TEXT> 2.NC stands for not connected. So just leave it not connect.

Thanksbest rgdsBill