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Keyestudio UNO R3 development board
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, 2 ICSP headers 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.
Note that the two ICSP headers are separately used to program the firmware to ATMEGA16U2-MU and ATMEGA328P-PU, but generally the two chips have been programmed well.
The Uno R3 differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 programmed as a USB-to-serial converter.
The UNO is the best board to get started with electronics and coding. If this is your first experience tinkering with the platform, the UNO is the most robust board you can start playing with.
|Input Voltage (recommended)||7-12V|
|Digital I/O Pins||14 (of which 6 provide PWM output)|
|PWM Digital I/O Pins||6 (D3, D5, D6, D9, D10, D11)|
|Analog Input Pins||6 (A0-A5)|
|DC Current per I/O Pin||20 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 (ATmega328P-PU)|
|EEPROM||1 KB (ATmega328P-PU)|
|Clock Speed||16 MHz|
- 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board.
- Stronger RESET circuit.
- Atmega 16U2 replace the 8U2.
Element and Pin Interfaces
Specialized Functions of Some Pins
- Serial communication: Digital pins 0 (RX) and 1 (TX).
- PWM Interfaces (Pulse-Width Modulation): D3, D5, D6, D9, D10, D11
- External Interrupts: D2 (interrupt 0) and D3 (interrupt 1). These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value.
- SPI communication: D10 (SS), D11 (MOSI), D12 (MISO), D13 (SCK). These pins support SPI communication using the SPI library.
- IIC communication: A4 (SDA); A5(SCL)
1. The Arduino Uno has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.
2. Automatic (Software) Reset:
Rather than requiring a physical press of the reset button before an upload, the Arduino Uno board is designed in a way that allows it to be reset by software running on a connected computer.
3. The Uno board contains a trace that can be cut to disable the auto-reset. The pads on either side of the trace can be soldered together to re-enable it. It's labeled "RESET-EN". You may also be able to disable the auto-reset by connecting a 110 ohm resistor from 5V to the reset line; see this forum thread for details.