Original Arduino Uno R3 Development Board

The Original Arduino Uno R3 Development Board runs on the ATmega328P microcontroller clocked at 16 MHz. It carries 32 KB of flash memory, 2 KB of SRAM, and 1 KB of EEPROM — enough to handle most beginner and intermediate embedded projects without reaching memory limits. The original arduino uno ships with a genuine Atmel chip, which matters when you need predictable timing behavior in serial communication or PWM control. An onboard USB-to-serial converter handles code uploads directly from the Arduino IDE over a standard USB cable.

The board operates at 5V logic, which makes direct interfacing with most sensors and modules straightforward. One thing worth knowing — the 3.3V pin is current-limited to 50 mA, so powering multiple 3.3V modules from this pin simultaneously will cause instability. The recommended input voltage through the barrel jack is 7 to 12V; running it below 7V from Vin can cause the onboard regulator to drop out under load. The EEPROM retains data after power-off, which is useful for storing calibration values or configuration flags without needing external storage.

The arduino uno r3 board works with the Arduino IDE, PlatformIO, and can be programmed in C or C++ using standard AVR libraries. It accepts most Arduino shields due to its standard header layout. Engineering students use it for lab experiments, hobbyists build automation projects with it, and makers use it as a controller core in robotics and sensor systems. StemVolt stocks the original version with the genuine ATmega328P — not a clone with an unmarked chip.