Review on 🔍 WOWOONE MQ-135 Starter Kit for Detection Module by Luke Hodes

Of course, these sensors are quite easy to use and work. I can't confirm how accurate they are, but on a low scientific basis, the presence of a flame or butane near the sensors will pick it up. I would use the unified MQ gas sensor library. Not very difficult to use for the average programmer. Now if one of the sensors didn't have a blown chip and the other sensor needed re-soldering so I could get a clean connection I would give this product two more stars. A quick tip to get you started with these sensors. . Use the MQUnified Gas Sensor Library in the Library Manager. Make sure you have a stable power supply as these sensors get hot and require some power compared to other devices. All sensors are safe to touch with hands, they just feel warm. I still wouldn't recommend placing them in hard-to-reach places or handling them with the power on too often. You can use the digital pinout, or I prefer to just get the raw value from the analog pinout. Only use one on the MCU unless you know what you're doing and can't avoid conflicts. Looking from behind one of the sensors, this is the pinout: analog output, digital output, ground, VCC (each from left to right). Sensors typically take 24-48 hours to warm up and read real values, assuming you calibrate them outdoors. When using the MQ library, make sure to update MQ.update after the sensor has warmed up, otherwise the library will only return zeros.