I hooked my Arduino UNO to one of the USB port of my rpi3.
The Arduino itself power a small light sensor, later on i plan on adding LCD display, LEDs, etc
Can the pi handle it without any fuss ?
My project is time sensitive.
I tried separating the power source, and feed the Arduino by another supply.
And then use the pi Tx/Rx, to communicate with the Arduino by serial.
It just added more complexity to a rather simple setup.
rPi3 powered by a 2A supply
Sensor hooked to Arduino pins(+5v, GND, A0 pin), consumes 4mA
Arduino hooked to rPi by USB