HC-SR04 ultrasonic distance sensor. This economical sensor provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm
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A semiconductor light source that emits light when current flows through it. This is a standard LED in a through-hole package, suitable for easy prototyping and durable mounting.
A common reference point and return path for electric current in electronic circuits—commonly referred to as ground. It serves as the baseline voltage level and is essential for stable circuit operation and signal integrity.
