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Add notice about power supply #560

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Rotzbua 2021-05-06 13:22:01 +02:00 committed by GitHub
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@ -250,6 +250,7 @@ Troubleshooting
#. Check your physical connection, see `Pin Layout`_ .
#. Check your pin settings/variables in the code, see `Pin Layout`_ .
#. Check your pin header soldering. Maybe you have cold solder joints.
#. Check your power supply. Maybe add a capacitor between 3.3V and GND to stabilize the power #560, sometimes an additional delay after `PCD_Init()` can help.
#. Check voltage. Most breakouts work with 3.3V.
#. SPI only works with 3.3V, most breakouts seem 5V tolerant, but try a level shifter.
#. SPI does not like long connections. Try shorter connections.