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--- old_old [2019/07/18 13:08] – created visentin
+++ old_old [2019/07/18 13:09] – visentin
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 {{ :delta:build_own_controller:adapter-print-encoder.png?200 | Voltage divider for the encoders}}
 \\ \\
+===== GPIOs =====
+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.{{ :delta:build_own_controller:adapter-print-gpios.png?200 |Gpio connection of the adapterprint}}