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“In this project you will learn how to wire up a Photoelectric IR Through Beam Sensor (HC-89) and write some code to calculate the speed at which a motor is rotating.”
Content for HC-89
The HC-89 module features a narrow beam IR emitter and reciver directly opposite each other encased in the black U-channel. When an object is placed in the channel to block the IR, the on-board LM393 chip registers the break and adjusts the ouput signal to notify the user.