Questions tagged [gas-sensor]

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Build electrical characteristic for gas measurament via IR sensor

I'm building a CO2 measurement unit via Arduino and I'm the phase of choosing the sensors. I've found out this IR sensor that, thanks to an emitter with WL of 4.26um is able to output a voltage ...
-2
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2answers
39 views

What technologies are used to fabricate gas sensors?

Different types of gas sensors exist. Sensors that work with light or resistance sensors. In general, what technologies are used to build sensors?
2
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3answers
137 views

Potentiostat Drift

Firstly - First post so let me know if I have done anything wrong. Okay, so I am tying to get this biased potentiostat to work. I have attached the circuit below. I am using the following sensor: ...
0
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1answer
47 views

Gas sensor parameters

I've just found this sensor on Aliexpress, but the vendor says that he provides more information after the device is bought. There is no information on what sensors does this device feature. I can't ...
0
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1answer
53 views

Can MQ-135 Gas Sensor be used to make DIY CO2 level monitor?

So I am thinking of building an device to measure CO2 levels in the air DIY fashion as premade equipment costs upwards of 100$. I have found some information on how to build such a device using ...
-1
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1answer
109 views

Comprehending wiring data sheet for ME3 C2H4 gas sensor

I am humbly requesting an English translation of this image. The only thing I figured out is that the box on the top left is the ME3 sensor I am trying to connect to an Arduino. It has three pins, as ...
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0answers
38 views

What are my options to measure oxygen concentration in a high temperature wood burner flue gas?

I'd like to measure oxygen concentration in flue gas from my wood burner. Lambda sensors are suitable but, even if relatively cheap, they need a control unit to keep working temperature and other ...
0
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2answers
72 views

Are there any reasons I shouldn’t use a nodemcu’s 3.3v pin with this component?

I have this Hydrogen Sulfide gas sensor and the datasheet says the supply voltage requires a regulated voltage with a min of 2.6v and max of 3.6v I can’t find any datasheet for the nodemcu v3 (spent ...
1
vote
1answer
102 views

How can I measure a sensor's load resistance which is adjusted by a potentiometer?

I have this MQ136 sensor that comes with a shield. Like most of the MQ series of gas sensors, you can get them with or without a shield. Unfortunately, I've been unable to find a datasheet that ...
1
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0answers
117 views

Control variable external power supply with Arduino

I'm currently working on an air pollution controller project and I have a problem to control an external power supply to supply 5V, 1.5V or 0V to an MQ7 gas sensor. Using the direct PWM output to ...
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1answer
46 views

Is a buffer required for this gas flow sensor to ADC connection?

I'm designing part of an application that will consist of an Omron D6F-P0010A1 MEMS flow sensor. The analog output of the sensor will be connected to a TI ADS1114 ADC. I'm trying to figure out from ...
3
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1answer
148 views

Can Mq4 sensor be used for smoke detection?

I wanted to ask if Mq4 can be used for fire smoke detection? I read it have small sensitivity to smoke in the data sheet, but I wanted to know what is the least value in ppm for it to detect smoke ? ...
0
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1answer
77 views

Mq4 sensor doesnt detect natural gas but detects cigarette lighter gas only! [closed]

I am working on a project for detecting natural gas of cooking stoves, I have tested several sensors but the mq4 sensor was the one that worked fine. Now after about one month of using the sensor i ...
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3answers
4k views

How to calculate Gas sensor PPM from analog readings?

I am new to Arduino and electronics in general.I am working on MQ 7 Gas sensor to test Carbon monoxide level. But the issue is i still can't grasp the concept of converting analog readings to PPM. I ...
1
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0answers
101 views

Trouble with biased measurement for Oxygen Sensor EC410

I need to achieve a -600mV bias between Vsense and Vref for a potentiostat circuit. I'm trying to replicate the design for an Oxygen Sensor (EC410) by following the above image from the application ...
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1answer
66 views

Simple circuit slowly powering down

I have a gas sensor module here, with a power led and a digital out led (which glows in case of successful gas detection) built in it.... A simple circuit here, just connected the vcc and ground of ...
-1
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1answer
267 views

History and lineage of the MQ- series of MOS gas sensors? [closed]

MOS-type gas sensors (described below) have been around for almost a half-century. The original TGS-109 (Taguchi Gas Sensor 109) was introduced in about 1969! From http://www.figaro.co.jp/en/company/...