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There is an onboard micro-SD card slot
This Analog Piezoelectric Ceramic Vibration Module buffers a piezoelectric transducer that responds to strain changes by generating a measurable output voltage change which is proportional with the strength of vibration also known as ‘piezoelectric effect’
You can uses it in your DIY or your product
This device can also be used to make a programmable output regulator
AT89C2051-24PU Microcontroller AT89C2051 There is an onboard micro-SDIntroduction : AT89C2051 24PU Microcontroller Features : Part No: AT89C2051 24PU Manufacturer: Microchip CPU Core: 51Series Program Memory Size: 2 kB Data Bus Width: 8 bit ADC Resolution: No ADC Maximum Clock Frequency: 24 MHz Number of I Os: 15 I O Connectivity: UART USART Program Memory Type: FLASH Data RAM Size: 128 B 2. 7V to 6V Operating Range Operating Temperature: 40C ~ 85C (TA) Mounting Type: Through Hole Package Case: 20 DIP
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