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Four TTL serial access points: Useful for multi-device builds
and power connectors for a complete portable power setup
ultrasonics
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Proximity Inductive 4mm Metal Sensor LJ12A3-4-Z/BY 1757 Four TTL serial access points:Detect Nearby Objects Without Contact The Proximity Inductive 4MM Metal Sensor LJ12A3 4 Z BY is a proximity presence sensor module with digital output designed for obstacle detection, touchless triggers, object counting, and simple automation. It is a practical fit for makers, students, and engineers who want reliable sensor data in embedded builds. Key details include Working Voltage: DC 6~36V;; the output signal: Low. Why youll love it Controller
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