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Arduino Uno is a microcontroller board based on the ATmega328P (datasheet). 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. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.. You can tinker with your UNO without worring too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again. Summary| Microcontroller | ATmega328 | | Operating Voltage | 5V | | Input Voltage (recommended) | 7-12V | | Input Voltage (limits) | 6-20V | | Digital I/O Pins | 14 (of which 6 provide PWM output) | | Analog Input Pins | 6 | | DC Current per I/O Pin | 40 mA | | DC Current for 3.3V Pin | 50 mA | | Flash Memory | 32 KB (ATmega328) of which 0.5 KB used by bootloader | | SRAM | 2 KB (ATmega328) | | EEPROM | 1 KB (ATmega328) | | Clock Speed | 16 MHz |
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