The MQ-135 is an air quality sensor that detects gases like ammonia, alcohol, and smoke. It provides analog output for monitoring air pollution levels.
The LDR Light Sensor Module detects light intensity, with resistance decreasing as light increases. Ideal for automatic lighting and brightness sensing.
SR501 PIR Sensor is designed for motion detection, is used to detect human presence in indoors in alarm and lighting systems. The sensor has a range of up to 7 meters.
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