The EEROS Education Robotics Platform

To get the +5V to the adapter print you can simply get it from the PWR port of the Beagle Bone Blue. You’ll need this 5V for both types of encoders used on the Delta. The encoder inputs of the Beagle Bone Blue are only 3.3V capable. To get the signals from 5V down to 3.3V a voltage divider is used for each encoder channel.

You can get the 3.3V also from the PWR port of the Beagle Bone Blue. This is used for the button pullups. The leds are pulled down and driven with the 3.3V from a gpio.
The output of the gpios is only 3.3V. To get a stronger magnetic field from the elctromagnet, a transistor is used to get 12V over the electromagnet.