Project: gas-sensor comparision

[stift_95]

Hey guys,

I would like to compare a few gas-sensors like MQ-131 ozone sensor with one of the sensors from UST - Umweltsensortechnik.
So for example the GGS 5430 T-sensor would be a candidate.
I'm using the Arduino Uno and for better mobility it should be supplied with and external supply like batteries or powerbank.

Because I'm still at the beginning of electronics, I'm really not sure how i should set up my circuit. Especially when planning on using more than sensor at the same time, while they often have different voltages needed.

I would really appreciate it, if someone would take the trouble and show me how to plug it up.

Thanks in advance

[ruilviana]

Hi,
please, read this.

How to get the best out of this forum

Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. Please read and follow the instructions below. Being new here you might think this is having rules for the sake of rules, but that is not the case. If you don’t follow the guidelines all that happens is there is a long exchange of posts while we try to get you to tell us what we need in order to help you, which is frustrating for you and frustrating for us. The people who try to help with your pro…

[stift_95]

@ruilviana I'm not quit sure what's missing, I changed the category if thats what bothered you.

[Paul_KD7HB]

What is missing is: you do not have any sensors, but you want someone to tell you how to hook them up to the Arduino.
Paul

[jremington]

To find tutorials on how to connect an Arduino to a sensor with name or model number "XYZ", it usually works to search for "arduino XYZ".

[stift_95]

So then let me try again,

the GGS 5430 gas-sensor has 4 pins to it. 2 for the heating, 2 for the measurement.
As you can see in the datasheet, the heating voltage is 2,5 V while the measurement voltage is less than 250 mV.

My question now: do you have any suggestions how I should plug it up?

@Paul_KD7HB a guess how I can lower the voltage to <250mV would be a good start.

@jremington I honestly couldn't find anything to this topic, which is the main reason I made this post

[jremington]

The GGS 5430 has the same design as the MQ sensor series, so you connect them the same way (see the MQ-131 data sheet for a connection diagram).

If you want to power the heater from 5V, you will need to use a 20 Ohm resistor in series with it.

Presumably, the "measurement voltage" means that the absolute maximum current through the sensor chip is 0.25V/R0, where R0 is the chip resistance when the heater is on. You could limit that current with an appropriate series resistance to 5V as well.