Grumpy_Mike:
If you do the same thing on the BB board you will get the same results, you will fry everything. This is because both the Raspberry Pi and BB board are 3V3 systems and the Arduino is a 5V system.You can connect them together through the USB with no problem but if you connect the GOIO pins together you will fry the lower voltage system. You need a level shifter, a simple resistor potential divider will do to cut down the 5V from the Arduino to the 3V3 of the other systems. Don’t use a level shifter designed for an I2C bus.
Oh I see, so I can connect them via the USB with no frying right? Thank you for letting me know about the voltage difference!
