SEN0440 (MiCS-5524) I2C interface
Sapper 2025-07-09 17:41:07 1166 Views3 Replies Hi,
I intend to use SEN0440 (MiCS-5524) in my project.
On Product Wiki Page, it says that it has i2c interface, but the product picture does not show i2c, but only shows Analog-Value pin and Enable pin.
Q1: Does SEN0440 has i2c interface ?
Q2: I need to get PPM/PPB readings of all detected gasses (CO, CH4, C2H5OH, C3H8, C4H10, H2, H2S and NH3) individually. Is it possible or not ?
Q3: How many gasses can it measure individually ? In Product Wiki introduction section, it mentions 8 gasses, in Specification section it mentions only 5 gasses, in Sample Code it mentions 6 gasses. I am confused.
Kind Regards,
Hassan
From my experience using the SEN0440, it does not actually provide a real I2C output for reading separate gas data directly. The module mainly works through the analog output pin, so Q1 is basically no for practical use.
For Q2, you cannot get accurate individual PPM/PPB values for all gases separately. The MiCS-5524 is a mixed gas sensor, meaning different gases affect the same signal together. It can detect the presence of gases like CO, CH4, NH3, H2, etc., but it cannot clearly distinguish each gas independently.
For Q3, the different numbers on the wiki are mostly because the sensor is sensitive to multiple gases, but not all are officially calibrated. In real usage, it is better to think of it as a general air quality / combustible gas sensor rather than a precise multi-gas analyzer.
syhfsfsa 1. The SEN0440 device with the MICS-5524 chip does not have any digital output. The only output is an analog voltage on pin A0, just like SEN0441 with the MICS-2714 chip.
2. The metal oxide sensors (all the MEMS sensors in this series) can only detect oxidizing or reducing environments. They do not exhibit specificity – i.e., they cannot pick out which gas it is, only that something is consuming oxygen or providing oxygen.
3. The 5524 chip will happily respond to anything that reacts with oxygen, including several chemicals not named in the sample code or the data sheet. If you are wanting to detect a specific gas, you will have to do your own testing. Warning: these are not calibrated devices and can only give you an indication of a presence and maybe a rough idea of concentration. For your applications, that may be good enough, but be aware.
SWGlassPit Yes. Not clear where the I2C pins are. I hope dfrobot will clarify.
ahsrab.rifat 
