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Use a permanent magnet and a reed switch.
GlueFix the magnet on the moving part and put the reed switch on the fixed part. Then monitor the reed switch with the microcontroller.
Glue the magnet on the moving part and put the reed switch on the fixed part. Then monitor the reed switch with the microcontroller.
Fix the magnet on the moving part and put the reed switch on the fixed part. Then monitor the reed switch with the microcontroller.
