A handy set of spacers to separate one assembly component from another.
M3 Female & M3 Female ends
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The PIR Sensor detects motion by measuring changes in the infrared (heat) levels emitted by surrounding objects.
The Vibration module based on the vibration sensor SW-420 and Comparator LM393 to detect if there is any vibration that beyond the threshold. The threshold can be adjusted by the on-board potentiometer.
MQ-4 gas sensor has high sensivity to Methane, also to Propane and Butane. The sensor could be used to detect different combustible gas.