Uno is based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, 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. Leonardo R3 is a microcontroller development board based on the ATmega32U4. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It provides everything needed to support the microcontroller; simply power it with a AC-to-DC adapter to get started. UNO R3 is improved version. It has perfect quality and much more performance! In addition, the SainSmart Uno R3 now uses an ATMega16U2 which allows for faster transfer rates and the ability to have the UNO show up as a keyboard, mouse, joystick, etc. No drivers needed for Linux or Mac (inf file for Windows is needed). MEGA2560 R3 uses an ATMega16U2 which allows for faster transfer rates and more memory. No drivers needed for Linux or Mac, and the ability to have the Uno show up as a keyboard, mouse, joystick, etc. It also adds SDA and SCL pins next to the AREF. In addition, there are two new pins placed near the RESET pin. One is the IOREF that allow the shields to adapt to the voltage provided from the board. The other is a not connected and is reserved for future purposes. NOTE: The link is the documentation. https://s3-ap-northeast-1.amazonaws.com/sain-amzn/20/20-011-909/LCD1602-022.rar https://s3-ap-northeast-1.amazonaws.com/sain-amzn/20/20-011-937/SainSmart+UNO+R3.rar
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