Fermion: MEMS Odor Smell Gas Detection Sensor

Q: Hello, I’ve been tasked with purchasing an Odor Detector, specifically the ‘Fermion: MEMS Odor Smell Gas Detection Sensor (Breakout, 0.5-50ppm)’. However, I’m unable to determine the unit of measurement for this device. I’ve already consulted the project’s wiki and the SEN0571-Odo documentation. Is it designed to detect a mixture of different gases? Does it use ou/m³ as its unit of measurement? Or is it capable of distinguishing between various gases detected by the sensor and presenting the data in ppm?

This type of sensor does not return accurate data in PPM or other units, as it is described in our wiki as a qualitative rather than an accurate quantitative sensor. This sensor will only respond to whether the target gas level is rising or falling. In the case of the Odor you purchased, the target gas is a combination of H2S, EtOH, acetone, and so on.<a href="https://www.dfrobot.com/product-2511.html" rel="nofollow noopener" title="https://www.dfrobot.com/product-2511.html">https://www.dfrobot.com/pro...</a>If you need accurate data in PPM, please use one of our other range of gas sensors.

1. Example Code for Arduino-Read Sensor Raw Value

This project demonstrates how to read the raw analog value from the Fermion: MEMS Odor Sensor using an Arduino board. Users will learn how to connect the sensor to the Arduino, read the analog output signal, and view the raw sensor values via the serial port monitor.

Reference

The content outlines precautions for using MEMS gas sensors, including avoiding volatile silicon compounds, corrosive gases, extreme environments, and ensuring proper handling and storage to maintain sensor integrity and performance.

Parameter	Specification
Gas detected	H2S, EtOH, acetone, etc
Detection range	0.5-50ppm
Operating voltage	3.3-5V
Operating current	<20mA
Output signal	Analog voltage
Load resistance（RL）	4.7KΩ
Sensitivity	R0(in air)/Rs(in 5ppm H2S) ≥ 2
Operating temperature	-10-50℃
Operating humidity	15-90%RH (non-condensing)
Lifespan	≥5 years (in air)
Dimension	13×13 x 2.5mm/0.51×0.51x0.1”

Num	Label	Description
1	A	Analog Voltage Output
2	VCC	+
3	GND	-

Fermion: MEMS Odor Smell Gas Detection Sensor

Specification

Pinout