My question is regarding your project shown in your Arduino library.ĭo i just need to fill in the sensor sensibility (in my case is 29.40 and change the sensor type to SO2?I changed also the final line to read temp in Celcius. I have been trying to build an SO2 Concentration logger. I´m absolutelly new here, and also developing projects with Arduino or any other platform, so please be patient with me.

The second project is an Arduino library for the Analog Gas Sensor Module. The first project is using a SPEC CO Sensor with no support electronics along with an Arduino. I wanted to add that I have 2 projects I put together. SPEC sensors has also provided a couple of links to projects they had done:

For the easiest low cost solution, use 10k resistors to buffer Vref, then measure Vref with ADC, however, this adds some current draw to the project, and it is no longer low power.

There is a voltage follower as well as a battery holder in this development kit: SDK-O3 SENSOR DEVELOPER KIT PN# 1684-1051-ND.

If they read the voltage directly, the line can act like an antenna, and introduce 60 Hz (or 50 Hz if they are international).

If users want to read Vref, they must use a voltage follower, (Figure 3 here: ).

There are 3 ways to overcome this without a voltage follower: If users want to read Vref, they must use a voltage follower, (Figure 3 here: ).

It is not necessary to read Vref, users can find a stable base line in clean air, and use that value to convert voltage to concentration. The Analog Gas Sensor Module (“SENSOR OZONE ANALOG VOLTAGE MOD” on Digikey) has a few outputs. I reached out to the manufacturer regarding this and they had this to say:

Digi 003 specs