Phil Weasel
Another important part. The connection to the sensors.I opted to buffer the input with a triple-schmitttrigger just to make sure....
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The 5V output must be protected against a shot circuit at all cost. Problems on the 5V line can break the rest of the logic and/or shutdown the controller.
For this i use a powerswitch from USB-devices.
U9 turns off when 500mA is exceeded and also can be dis/enabled by the controller.
Convenient
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