Some resources to help you getting started with STM32 programming.
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Sensitive material of MQ135 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, the sensors conductivity is more higher along with the gas concentration rising. Convert change of conductivity to correspond output signal of gas concentration. MQ135 gas sensor has high sensitivity to Ammonia, Sulphide and Benzene steam, also sensitive to smoke and other harmful gases. It is with low cost and suitable for different application.
Used for familiar, surrounding environment noxious gas detection device. Apply to ammonia, aromatics, sulphur, benzene vapour, and other harmful gases/smoke, gas detection, tested concentration range: 10 to 1000 ppm.