Arduino Uno
2.Operating Voltage : 5V
3.Input Voltage (limits) : 6-20V
4.Digital I/O Pins : 14
5.Analog Input Pins : 6
6.Serial / UART:0 pin RX and pin 1 TX
7.PWM (pulse-width modulation): pins 3, 5, 6, 9, 10, and 11. Can provide 8-bit PWM output
8.SPI (Serial Peripheral Interface): pins 10 (SS), 11 (MOSI), 12 (MISO), and 13 (SCK). These pins support SPI communication using the SPI library
9.AREF (analog reference): Reference voltage for the analog inputs
10.DC Current per I/O Pin : 40 mA
11.DC Current for 3.3V Pin : 50 mA
12.Flash Memory : 32 KB (ATmega328) of which 0.5 KB
13.SRAM : 2 KB (ATmega328)
14.EEPROM : 1 KB (ATmega328)
15.Clock Speed : 16 MHZ
16.LED: There is a built-in LED driven by digital pin 13. When the pin is high value, the LED is on, when the pin is low, it is off.
17.Reset: Typically used to add a reset button to shields that block the one on the board
18.GND: Ground pins.
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