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MQ Series Sensors MQ-135 MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-8 MQ-9 Detecting Gas Smoke Sensor With MQ Socket Base
Price history
- for 3 month
- for half a year
- Requires Alitools extension
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Customer Reviews
Package arrived 34 days after ordering. All pieces seem to be working, though one piece's analog output stays near 1V in clean air while others stay at around 0.5V next to it. Last time I ordered these, one piece had a defect in digital output... These modules apparently aren't made and tested so well, but they're better than some out there.
Package arrived 31 days after ordering (also I ended up paying 50% of the order's total cost as customs fees). One of 4 pieces has a fault, its DO led is always on and the digital output is always low, no matter which way I turn the knob. Also the led is on while digital output is low (like active low). It also gets hotter than others. But I didn't open a dispute because it's still usable since its analog output still produces voltages more or less the same as the others. The other pieces work fine. Their digital outputs go high (as expected) when the analog reading goes high, and the DO leds turn on when digital output goes high (also as expected). Overall ok I guess but I'd prefer getting pieces without any problems.