Piezo electric 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...
STMicroelectronics STM32 NUCLEO-F411RE Nucleo-64 ARM development board with STM32F411RE MCU 512 KB Flash, supports Arduino Uno compatible header connectivity and ST morpho connectivity. Arm® Mbed Enabled™.The STM32 NUCLEO-F411RE board provides an affordable and flexible way for users..
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