The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The power source is selected automatically. The Arduino Uno board can be powered via a USB connection or with an external power supply. Flash Memory: 32 KB (ATmega328P) of which 0.5 KB used by bootloader.Digital I/O Pins: 14 (of which 6 provide PWM output).The worst case scenario is that you would have to replace the chip and start again :) Arduino Uno Specification You can tinker with your UNO without worrying too much about doing something wrong. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cableor power it with an AC-to-DC adapter or battery to get started. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. Arduino Unois a microcontroller board based on the ATmega328P ( datasheet ).
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