Hi everyone! I’m working on a project using the MQ-135 gas sensor to measure air quality, but I’m running into issues with inconsistent analog readings. I’m using a 10-bit ADC on an Arduino Uno and reading values every second. Even after preheating the sensor as recommended, the readings still fluctuate quite a bit in a stable environment. I’ve tried using a simple moving average to smooth it out, but it still feels noisy.
Is there a better filtering method or circuit setup to get more stable readings? Also, would switching to an external ADC with better resolution make a significant difference for this kind of sensor?
Appreciate any tips—thanks!