Arduino Uno R3 Development Board (ATmega328P)

The Arduino Uno R3 is the undisputed king of the maker world. If you are just starting with electronics or need a reliable board for a quick prototype, this is it.

Unlike the complex ESP32, the Uno is 5V logic native, which makes it much more forgiving with sensors and easy to power. It uses the ATmega328P microcontroller and is programmed via the Arduino IDE over a standard USB A-to-B cable (printer cable). It has a replaceable chip (DIP version), so if you accidentally burn it out, you can just swap the IC instead of buying a whole new board.

Key Features

• Microcontroller: ATmega328P (8-bit).
• Operating Voltage: 5V.
• Input Voltage (recommended): 7-12V (via DC Barrel Jack).
• Digital I/O Pins: 14 (of which 6 provide PWM output).
• Analog Input Pins: 6.
• Flash Memory: 32 KB (ATmega328P) of which 0.5 KB used by bootloader.
• Clock Speed: 16 MHz.

Pinout

1. USB Port: For programming and power.
2. DC Jack: External power input (7-12V).
3. 5V / 3.3V: Power output pins for sensors.
4. GND: Ground pins (3 available).
5. A0 - A5: Analog Inputs (10-bit resolution).
6. D0 - D13: Digital I/O (D3, D5, D6, D9, D10, D11 are PWM).