There are some more differences, like the touch controller. Here is a table that shows the main differences between the R3 and the R4. The power supply is a bit stronger than on the Uno and of course we provided four extra connector pins to accomodate Port E of the ATmega328PB. This saves on firmware/driver maintenance & device programming. One of the main differences is the USB-to-serial converter for which I used an FTDI chip instead of another AVR. The circuit of the R4 is pretty close to the Uno. Because it is backwards compatible you can think of it as revision 4 of the Uno, which is why we called it the R4. Identical form factor as the Uno but based on the ATmega328PB-AU, this board has much more features than the Uno. This board is an evolution of the Arduino Uno R3 board. The Elektor Uno R4 is an Arduino Uno R3 equiped with the ATmega328PB-AU featuring 2x USART, 2x I2C and 2x SPI and much more.
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