A handy set of spacers to separate one assembly component from another.
M3 Female & M3 Female ends
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Flame Sensor 120 deg. range is able to detect the flame band respectively in the range of 700-1100 nm.
Photo resistors are light sensitive resistors whose resistance decreases as the intensity of light they are exposed to increases.
The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object like bats or dolphins do.