Description:
Piezo elements come in handy when you need to detect vibration or a knock. You can use these for tap or knock sensors pretty easily by reading the voltage on the output. They can also be used for a very small audio transducer such as a buzzer.
8×8 Led Matrix – Red
74164 (8 Bit Serial Input – Parallel Output Shift Register)
SparkFun RedBot Sensor - Line Follower analog (SEN-11769) (USA)
Ultrasonic Sensor Module
Buzzer 5v 








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