A handy set of spacers to separate one assembly component from another.
M3 Female & M3 Female ends
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The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object like bats or dolphins do.
MQ-4 gas sensor has high sensivity to Methane, also to Propane and Butane. The sensor could be used to detect different combustible gas.
Sense the presence of an object by using the reflective IR beam from the object