I myself own an Arduino Uno R3 and found that it can simplify my projects development and microcontroller programming, but sometimes I need to know the Arduino pinout. That is why I have written this ...

Note: Some pins are not connected on a standard Arduino Uno R3 but still listed so you can use them if you had a custom board. It might also be possible that your ISP header of the 16u2 is flipped 180 ...

The HIDUINO is a set of firmware for the ATmega8u2 used in the new revisions of the Arduino (Uno, ... have the Arduino, fetch the avr.isp.03 ... covers AVR devices and ISP pinouts ...

Both the Arduino Nano and Uno can be powered via their integrated USB connectors. This automatically supplies regulated 5V power to the board, allowing you to use any USB-supported power source ...

Now let's look at the pinout for the Arduino Uno R4 WiFi development board. As you can see it is very similar to the Uno R3 development board but with each pin with more functions. It also provided ...

Each of the 14 digital pins on the Arduino Uno can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 5 volts. Each pin can provide or receive ...

Once you’ve done that, you have essentially an Arduino with limited pinout and two onboard LEDs, ... On the other hand if you already have the Arduino, fetch the avr.isp.03 firmware and AVRdude.