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DFD: Design-For-Debug

As board space allows, add  features to the PCB that will help in debugging the design.

Unconnected headers for fixing board problems

Convenient power/gnd connections for scope probes

Test points for important subsystems (SPI bus, ADC, etc.)

Descriptive silkscreen

Extra LEDs, 7 segment display, serial port connection, speaker, etc..

These extras can be no-loaded when you go to production.

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