Arduino Uno R3
The Arduino Uno R3 is the most widely used development board globally. Based on the ATmega328P microcontroller.
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The Arduino Uno R3 (Revision 3) is an open-source microcontroller board that serves as the "brain" for countless electronics projects. It features everything needed to support the microcontroller: simply connect it to a computer via a USB Type-B cable or power it with an AC-to-DC adapter or battery. It is famous for its standard "Uno" footprint, which is compatible with hundreds of "shields" (expansion boards) that add functionality like GPS, Wi-Fi, motor control, and more.
| Feature | Specification |
| Microcontroller | ATmega328P (8-bit AVR) |
| Operating Voltage | 5V |
| Input Voltage (Rec.) | 7–12V |
| Input Voltage (Limit) | 6–20V |
| Digital I/O Pins | 14 (of which 6 provide PWM output) |
| Analog Input Pins | 6 (10-bit resolution) |
| DC Current per I/O Pin | 20 mA |
| Flash Memory | 32 KB (0.5 KB used by bootloader) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Clock Speed | 16 MHz |
| Communication | UART, SPI, I2C (TWI) |