Fermion: MiCS-5524 Gas Concentration Sensor

Q: SEN0440 (MiCS-5524 MEMS Gas Sensor) is powered by UNO 5V. However, the detected results for alcohol and CO are both showing 0 ppm. What could be the issue?

Firstly, let's check if there are any poor connections in the circuit. We suggest using the code and connection method provided in the tutorial. The sensor needs to be preheated for a while before use. If the output still shows 0, it's possible that there is no alcohol or CO present in the surrounding environment, or the concentration is very low. You can try placing a volatile alcohol swab and the sensor in the same bag to test it. After preheating, you can set the CALIBRATION TIME to 0 so that you don't have to wait for 3 minutes each time.<figure class="image"><img src="https://dfimg.dfrobot.com/62f31cceaa9508d63a4250e1/enshopforum/7662c63f95925a16ead65185113e8f62_0x0.png.webp"></figure>

Q: Is the SEN0440 MiCS-5524 pre-calibrated for these gases? Also, NO2 is mentioned in the Wiki etc, does this model measure (again, pre-calibrated) NO2?

Its library is not working with ESP32-S3. I can read analog value when using simple analogread but when I use "DFRobot_MICS.h" library, all values are always 0. Can you help me on this?

1. Example Code for Arduino-Read Gas Concentration PPM

Download the sample program to the Arduino UNO, and open Serial Port Monitor for viewing the NO2 gas concentration (PPM) data.

2. Example Code for Arduino-Detection of Gas Leakage

If you need a leak detection of the relevant gas, you can download the sample program to the Arduino UNO, open Serial Port monitor to see if the set gas is leaking.

3. Example Code for Arduino-Obtain Sensor Analog Value

If you want to obtain the original sensor data, calculate the gas concentration or add your own temperature compensation functions, you can download the sample program to the Arduino UNO, open serial port monitor to view the original voltage output of the MEMS chip MiCS-5524.

Reference

Parameter	Details
Detection of Physical Quantities	Gas concentration of CH4, C2H5OH, H2, NH3, CO or gas leakage of CO, CH4, C2H5OH, C3H8, C4H10, H2, H2S, NH3
Operating voltage	4.9～5.1V DC
Power dissipation	0.45W
Output signal	Analog quantity
Measuring range	- 1 – 1000ppm (Carbon monoxide CO) - 10 – 500ppm (Ethanol C2H5OH) - 1 – 1000ppm (Hydrogen H2) - 1 – 500ppm (Ammonia NH3) - >1000ppm (Methane CH4)
Working temperature	-30～85℃
Working humidity	5～95%RH （No condensation）
Storage temperature	-40~85℃
Lifespan	>2 years（in the air）
Circuit board size	12mm×16mm
Mounting hole size	Inner diameter 2mm/outer diameter 4mm
Weight	7g

No.	Name	Function
1	5V	+
2	GND	-
3	A0	Analog quantity output
4	EN	Power Supply diable/enable pin(enable at a low level，disable at a high level)

Fermion: MiCS-5524 Gas Concentration Sensor

Specification

Pinout