Public Lab Research note

Detect Hydrogen Sulfide (Fart ) in Public Toilets with Arduino UNO/NodeMCU(ESP8266)

by silentsairam | May 09, 2019 17:16 09 May 17:16 | #19288 | #19288 
Overview:
In this prototype, with Arduino UNO board, but any board with one analog input could be used.
This project requires some very simple soldering to attach 4 header pins with 500 0hms resistor to the perforated board.

Measurement VOCs:  
Sensitive to hydrogen, ammonia, ethanol, hydrogen sulfide, toluene, cigarette smoke.

Measurement Value: 
ppm, Here we measure in Voltage

Parts: 
1 x Arduino Uno with USB cable ,
1 x TGS23062 H2S sensor( picture below),
1 x Perforated board or Breadboard, Wires to solder and soldering station, conductive flux.


*TGS2602 sensor pins Arduino Uno:*
Pin1 - GND  -  of A1
Pin2 - In series 450 ohm or 500-ohm resistor,   The resistor is connected to the Arduino pin A1
Pin3 - 5V   +  Of 5V
Pin4 - 5V   +  Of 5V

[link text](https://gitlab.com/Sairamdhandapani/heart-beat-monitor-with-arduino-/tree/master/H2S%20sensor%20test)

3 Comments

  
Comment Author Profile Picture warren commented almost 5 years ago

Hi, cool! What is the range of concentrations this sensor can detect?

Also, what are some of the use cases you have in mind... like, landfill fumes, perhaps?

Thanks for posting!!!

Is this a question? Click here to post it to the Questions page.

  
silentsairam commented almost 5 years ago

This data /value are Analog values: -With he open air, after sensor warms up for ~1 minute: 52 -breathing slowly over the sensor for several seconds: 73 -holding sensor directly over an open bottle of grain alcohol: 235 -inside the washroom post pee/use of cleaning products: 450-600

For measuring in ppm the range of concentration as per datasheet is 1-30ppm and >10ppm indicates Unsafe.

Welcome @warren . Your past Prototypes were worth testing.

Right now TGS825 is not for scale if I am right.


  
silentsairam commented almost 5 years ago

Did test with Smoke dust, ciggar and cooking Gas. The values raised > 600+ indicating unsafe. Will test with landifll fumes and let know the readings of the same.


Reply to this comment...


Login to comment.

Share

Public Lab is open for anyone and will always be free. By signing up you'll join a diverse group of community researchers and tap into a lot of grassroots expertise.

Sign up