Alarm sensors pojawiące not a danger, for example, sound detectors, methane or carbon monoxide, so-called carbon monoxide.
The sensor is used to detect fire. It is powered with the voltage from 3.3 V to 5.3 V. The range of the sensed wave: from 760 nm to 1100 nm. The output is an analog voltage and digital signal. The device operates in temperatures from -25 °C to 85 °C.
Module with high sensitivity vibration sensor from Grove series. When the sensor is at rest, the output of the output transmitted is at a constant high signal (high) and the time of detection of the oscillations is changed to the low (low). Sensitivity can be adjusted using the potentiometer located on the board. The module is fully compatible with Arduino.
A sensor detecting high concentration of natural gas (methane) and cylinder gas (propane-butane) in the air. It is supplied with mains voltage of 230 V. It is used for prevention from natural gas leaks, alarming threat with an audio signal.