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You can play with both suggestions but do not forget to remove changes when the new revision is published. You will not need neither physical resistors (maybe only the 100 ohms suggested by holgerw but it is not required) nor editing the config.txt file.
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I'm not yet into GPIO sensor, but am headed that way. Had a look at the app. Found that everytime I reboot the Pi, it asks me to confirm it in the Setting/Devices pane. Once I give it read/write privileges, its fine until I reboot the Pi again.